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Jia J, Wang A, Peng S, Lian Y, Wu Q, Lin Z, Zhang Q, Ji X. Prediction of the potential distribution area of Spodoptera frugiperda and its parasitic wasp, Trichogramma pretiosum. Arch Insect Biochem Physiol 2024; 115:e22092. [PMID: 38409851 DOI: 10.1002/arch.22092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 02/05/2024] [Accepted: 02/08/2024] [Indexed: 02/28/2024]
Abstract
Spodoptera frugiperda is a migratory agricultural pest with fast-spreading speed, long migration distance, and wide host range, which seriously threatens the safety of economic crops. To predict the trends of S. frugiperda and its parasitoid wasp Trichogramma pretiosum in their habitats under current and future climatic conditions, based on MaxEnt model and geographic distribution data of their historical occurrence, we project the feasibility of introducing T. pretiosum to control S. frugiperda by evaluating on their potential global distribution. The results show that, under the current greenhouse gas concentration, the potential distribution area of S. frugiperda is concentrated in 50° N-30° S, with a total area of 1.74 × 106 km2 , and the potential distribution area of T. pretiosum in the whole world is 2.91 × 106 km2 . The suitable areas of T. pretiosum cover almost all the suitable areas of S. frugiperda, which indicates that T. pretiosum can be introduced to control S. frugiperda. The results of this study can provide a theoretical basis for the monitoring and early warning of S. frugiperda and the use of T. pretiosum to control S. frugiperda.
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Affiliation(s)
- Jingjing Jia
- Institute of Plant Protection, Hainan Academy of Agricultural Sciences (Research Center of Quality Safety and Standards for Agricultural products of Hainan Academy of Agricultural Sciences), Haikou, Hainan, China
- Key Laboratory of Plant Disease and Pest Control of Hainan Province, Haikou, Hainan, China
| | - Aqiang Wang
- Sanya Nanfan Research Institute of Hainan University, Sanya, Hainan, China
| | - Sihua Peng
- Sanya Nanfan Research Institute of Hainan University, Sanya, Hainan, China
| | - Yuyang Lian
- Sanya Nanfan Research Institute of Hainan University, Sanya, Hainan, China
| | - Qianxing Wu
- Sanya Nanfan Research Institute of Hainan University, Sanya, Hainan, China
| | - Zhufeng Lin
- Institute of Plant Protection, Hainan Academy of Agricultural Sciences (Research Center of Quality Safety and Standards for Agricultural products of Hainan Academy of Agricultural Sciences), Haikou, Hainan, China
- Key Laboratory of Plant Disease and Pest Control of Hainan Province, Haikou, Hainan, China
| | - Qiongkuan Zhang
- Sanya Nanfan Research Institute of Hainan University, Sanya, Hainan, China
| | - Xuncong Ji
- Institute of Plant Protection, Hainan Academy of Agricultural Sciences (Research Center of Quality Safety and Standards for Agricultural products of Hainan Academy of Agricultural Sciences), Haikou, Hainan, China
- Key Laboratory of Plant Disease and Pest Control of Hainan Province, Haikou, Hainan, China
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Zhou JC, Dong QJ, Shang D, Ning SF, Zhang HH, Wang Y, Che WN, Dong H, Zhang LS. Posterior concentration of Wolbachia during the early embryogenesis of the host dynamically shapes the tissue tropism of Wolbachia in host Trichogramma wasps. Front Cell Infect Microbiol 2023; 13:1198428. [PMID: 37424778 PMCID: PMC10324615 DOI: 10.3389/fcimb.2023.1198428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Accepted: 06/06/2023] [Indexed: 07/11/2023] Open
Abstract
Introduction The bacterial endosymbiont, Wolbachia spp. induce thelytokous parthenogenesis in certain parasitoid wasps, such as the egg parasitoid wasps Trichogramma spp. To complete the cycle of vertical transmission, Wolbachia displays efficient transovarial transmission by targeting the reproductive tissues and often exhibits strong tissue-specific tropism in their host. Method The present study aimed to describe the basic Wolbachia distribution patterns that occur during the development of Wolbachia-infected, thelytokous Trichogramma dendrolimi, and T. pretiosum. We used fluorescence in situ hybridization (FISH) to investigate Wolbachia signal dynamics during early embryogenesis (from 30 to 120 min). Wolbachia titers and distributions from the embryo to adult stages of Trichogramma after early embryogenesis were detected by absolute quantitative polymerase chain reaction (AQ-PCR) and FISH. The symmetry ratios (SR) of the Wolbachia signals were calculated using the SR odds ratios in the anterior and posterior parts of the host. The SR was determined to describe Wolbachia tropism during early embryogenesis and various developmental stages of Trichogramma. Results Wolbachia was concentrated in the posterior part of the embryo during early embryogenesis and the various developmental stages of both T. dendrolimi and T. pretiosum. Wolbachia density increased with the number of nuclei and the initial mitotic division frequency during early embryogenesis. The total Wolbachia titer increased with postembryogenesis development in both T. dendrolimi and T. pretiosum. However, the Wolbachia densities relative to body size were significantly lower at the adult and pupal stages than they were at the embryonic stage. Discussion The present work revealed that posterior Wolbachia concentration during early host embryogenesis determined Wolbachia localization in adult wasps. By this mechanism, Wolbachia exhibits efficient vertical transmission across generations by depositing only female Wolbachia-infected offspring. The results of this study describe the dynamics of Wolbachia during the development of their Trichogramma host. The findings of this investigation helped clarify Wolbachia tropism in Trichogramma wasps.
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Affiliation(s)
- Jin-Cheng Zhou
- College of Plant Protection, Shenyang Agricultural University, Shenyang, China
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Qian-Jin Dong
- College of Plant Protection, Shenyang Agricultural University, Shenyang, China
| | - Dan Shang
- College of Plant Protection, Shenyang Agricultural University, Shenyang, China
| | - Su-Fang Ning
- College of Plant Protection, Shenyang Agricultural University, Shenyang, China
| | - Huan-Huan Zhang
- Institute of Vegetable, Tibet Academy of Agriculture and Animal Husbandry Sciences, Lhasa, China
| | - Ying Wang
- College of Plant Protection, Shenyang Agricultural University, Shenyang, China
| | - Wu-Nan Che
- College of Plant Protection, Shenyang Agricultural University, Shenyang, China
| | - Hui Dong
- College of Plant Protection, Shenyang Agricultural University, Shenyang, China
| | - Li-Sheng Zhang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
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Guo W, Zhang M, Lin L, Zeng C, Zhang Y, He X. Bacterial Community Survey of Wolbachia-Infected Parthenogenetic Parasitoid Trichogramma pretiosum (Hymenoptera: Trichogrammatidae) Treated with Antibiotics and High Temperature. Int J Mol Sci 2023; 24:ijms24098448. [PMID: 37176154 PMCID: PMC10179479 DOI: 10.3390/ijms24098448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 05/03/2023] [Accepted: 05/06/2023] [Indexed: 05/15/2023] Open
Abstract
Wolbachia has been shown to induce thelytokous parthenogenesis in Trichogramma species, which have been widely used as biological control agents around the world. Little is known about the changes of bacterial community after restoring arrhenotokous or bisexual reproduction in the T. pretiosum. Here, we investigate the emergence of males of T. pretiosum through curing experiments (antibiotics and high temperature), crossing experiments, and high-throughput 16S ribosomal RNA sequencing (rRNA-seq). The results of curing experiments showed that both antibiotics and high temperatures could cause the thelytokous T. pretiosum to produce male offspring. Wolbachia was dominant in the thelytokous T. pretiosum bacterial community with 99.01% relative abundance. With the relative abundance of Wolbachia being depleted by antibiotics, the diversity and relative content of other endosymbiotic bacteria increased, and the reproductive mode reverted from thelytoky to arrhenotoky in T. pretiosum. Although antibiotics did not eliminate Wolbachia in T. pretiosum, sulfadiazine showed an advantage in restoring entirely arrhenotokous and successive bisexual reproduction. This study was the first to demonstrate the bacterial communities in parthenogenetic Trichogramma before and after antibiotics or high-temperature treatment. Our findings supported the hypothesis that Wolbachia titer-dependence drives a reproduction switch in T. pretiosum between thelytoky and arrhenotoky.
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Affiliation(s)
- Wei Guo
- Department of Entomology, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China
| | - Meijiao Zhang
- Department of Entomology, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China
| | - Liangguan Lin
- Department of Entomology, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China
| | - Chenxu Zeng
- Department of Entomology, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China
| | - Yuping Zhang
- Institute of Plant Protection, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
| | - Xiaofang He
- Department of Entomology, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China
- Key Laboratory of Bio-Pesticide Innovation and Application, Guangzhou 510642, China
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Al-Jalely BH, Xu W. Olfactory Sensilla and Olfactory Genes in the Parasitoid Wasp Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae). Insects 2021; 12:998. [PMID: 34821797 DOI: 10.3390/insects12110998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 10/30/2021] [Accepted: 11/02/2021] [Indexed: 11/17/2022]
Abstract
Simple Summary Parasitic wasps are the major natural enemies of many organisms, and therefore they are broadly used in the biological control of numerous agricultural and horticultural pests. For example, Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) is a tiny natural egg parasitoid of various agricultural pest insects, including Plutella xylostella, Helicoverpa armigera, Spodoptera frugiperda and Ectomyelois ceratoniae. However, how T. pretiosum seek and localise host insect eggs is still not clear. The olfactory system is critical in guiding insect behaviours, including mating, feeding and oviposition, which play pivotal roles in the interactions between parasitoid wasps and their hosts. This project aimed to investigate T. pretiosum major olfactory tissue (antennae) and the olfactory genes, including odorant binding proteins (OBPs) and odorant receptors (ORs). T. pretiosum adult antennae were examined under scanning electron microscopy, and four types of olfactory sensilla were observed. Using T. pretiosum genome, 22 OBPs and 105 ORs were identified, which were further compared with olfactory genes of other Hymenoptera insect species. The expression patterns of OBPs between T. pretiosum male and female adults were examined to identify female- or male-specific OBPs. This study enriches our knowledge of T. pretiosum olfactory system and will help better use it in the integrated pest management (IPM) for many insect pest species. Abstract Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) is a tiny natural egg parasitoid of several agricultural pest insects, which has been widely used in the biological control for Plutella xylostella, Helicoverpa armigera, Spodoptera frugiperda and Ectomyelois ceratoniae. However, limited studies have been conducted on T. pretiosum olfactory system, which is critical in regulating insect behaviours. In this study, T. pretiosum adult antennae were investigated under ascanning electron microscopy (SEM). Four types of olfactory sensilla were observed, including chaetica sensilla (CS), trichoid sensilla (TS), faleate sensilla (FS) and placoid sensilla (PS). Using T. pretiosum genome, 22 putative odorant binding proteins (OBPs) and 105 odorant receptors (ORs) were identified, which were further compared with olfactory genes of Apis mellifera, Nasonia vitripennis and Diachasma alloeum. The expression patterns of OBPs between T. pretiosum male and female adults were examined by quantitative real time PCR (qRT-PCR) approaches. Three female-specific OBPs (TpreOBP19, TpreOBP15 and TpreOBP3) were identified, which may play crucial roles in T. pretiosum host-seeking and oviposition behaviours. This study enriches our knowledge of T. pretiosum olfactory genes and improves our understanding of its olfactory system.
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Yu L, Feng Y, Zheng S, Li J, Liu R, Jin D. Cloning and characterization of a novel DNase gene from Trichogramma pretiosum. Protein Expr Purif 2021; 185:105896. [PMID: 33945845 DOI: 10.1016/j.pep.2021.105896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 04/26/2021] [Accepted: 04/27/2021] [Indexed: 10/21/2022]
Abstract
DNase is a powerful tool for a series of molecular biology applications. Developing a strategy for large-scale production of DNase with high purity and activity is critical for scientific research. In this study, a previously uncharacterized gene with nuclease activity was found in Trichogramma pretiosum genome. Pichia pastoris GS115 was preferred as the host to overcome the issues related to prokaryotic expression. Under the optimal conditions, the activity of T. pretiosum DNase (Tp-DNase) reached 1940 U/mL of culture supernatant in fed-batch fermentation. Using ion-exchange chromatography and adsorption chromatography, Tp-DNase was produced with a purity of >99% and molecular weight of 45 kDa. In vitro DNA degradation experiments showed that Tp-DNase could effectively degrade dsDNA, and its activity was slightly higher than that of bovine pancreas DNase I under the same conditions. Moreover, Tp-DNase can be used to eliminate nucleic acid contamination and improve the accuracy of nucleic acid detection.
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Affiliation(s)
- Lijuan Yu
- School of Life Sciences, Nantong University, Nantong, 226019, China
| | - Yi Feng
- School of Life Sciences, Nantong University, Nantong, 226019, China
| | - Suxiang Zheng
- School of Life Sciences, Nantong University, Nantong, 226019, China
| | - Jie Li
- School of Life Sciences, Nantong University, Nantong, 226019, China
| | - Ruocen Liu
- School of Life Sciences, Nantong University, Nantong, 226019, China
| | - Dayong Jin
- School of Life Sciences, Nantong University, Nantong, 226019, China.
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Araujo ES, Poltronieri AS, Poitevin CG, Mirás-Avalos JM, Zawadneak MAC, Pimentel IC. Compatibility between Entomopathogenic Fungi and Egg Parasitoids (Trichogrammatidae): A Laboratory Study for Their Combined Use to Control Duponchelia fovealis. Insects 2020; 11:E630. [PMID: 32937763 DOI: 10.3390/insects11090630] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 09/10/2020] [Accepted: 09/13/2020] [Indexed: 12/02/2022]
Abstract
Simple Summary The European pepper moth is an important pest of many crops; however, some countries, such as Brazil, do not have insecticides registered for combating this pest. In particular, the egg stage of the biological cycle of this moth is the most difficult life stage to control. In this sense, biological control agents, including egg parasitoids and entomopathogenic fungi, can be an alternative to pesticides. In this study, laboratory tests were conducted to evaluate the susceptibility of two species of egg parasitoids (Trichogrammatidae family) to entomopathogenic fungal strains (including two commercial bioinsecticides). These fungal strains were applied on eggs of the European pepper moth before and after parasitism by the parasitoids. Overall, the entomopathogens reduced the parasitism rate, adult emergence, and longevity of adult parasitoids by less than 30%. The results obtained constitute the first step in designing effective pest control strategies. Future research should investigate the sub-lethal effects of the fungal strains on the parasitoids in the field. Abstract The European pepper moth, Duponchelia fovealis (Lepidoptera: Crambidae), is a key pest in strawberry production. Entomopathogenic fungi (EF) and parasitoids of the Trichogrammatidae family are effective biological control agents of this pest with the potential to be used jointly for improved efficacy. This study aims to evaluate the susceptibility of Trichogramma atopovirilia and Trichogramma pretiosum to two Beauveria bassiana strains (B2 and B3) and two commercial bioinsecticides (Bovemax® and Methamax®) by applying them to D. fovealis eggs in pre- and post-parasitism periods. Pre-parasitism application of B2 and B3 did not affect the percentage of D. fovealis eggs parasitized by either Trichogramma species, except in the case of T. atopovirilia when eggs were sprayed with B3 at 1.5 × 105 conidia mL−1 (16.7% less than the control). In contrast, eggs sprayed with 1.5 × 108 conidia mL−1 of the commercial bioinsecticides were not parasitized by any Trichogramma species. Overall, the EF tested reduced the parasitism rate, adult emergence, and longevity of Trichogramma adults by less than 30% in all cases. The adverse effects of the B. bassiana strains and commercial products on the biological traits of both Trichogramma species were minimal, meaning that these agents can be used jointly in D. fovealis control strategies.
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Jaraleño-Teniente J, Lomeli-Flores JR, Rodríguez-Leyva E, Bujanos-Muñiz R, Rodríguez-Rodríguez SE. Egg Parasitoids Survey of Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) in Maize and Sorghum in Central Mexico. Insects 2020; 11:insects11030157. [PMID: 32121538 PMCID: PMC7143600 DOI: 10.3390/insects11030157] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 12/04/2019] [Accepted: 12/09/2019] [Indexed: 11/25/2022]
Abstract
Spodoptera frugiperda (Smith) is the main maize pest in America and was recently detected as an invasive pest in some countries in Asia and Africa. Among its natural enemies presented in Mexico, Trichogramma pretiosum Riley is the only egg parasitoid used in Integrated Pest Management (IPM) programs regardless of its effectiveness. A search for natural enemies of S. frugiperda was then carried out to determine whether this parasitoid has been established, and to detect native egg parasitoids or predators associated with this pest. The sentinel technique (egg masses) was used, and then placed in maize and sorghum fields in the state of Guanajuato, Mexico. Trichogramma atopovirilia Oatman and Platner, an egg parasitoid, and Chelonus insularis Cresson egg-larva parasitoid were recovered from field surveys. Among the natural enemies that preyed on eggs of S. frugiperda, we found mites of the genus Balaustium, and Dermaptera of the genus Doru, both species in great abundance. Laboratory tests were performed to compare the potential parasitism of T. atopovirilia against T. pretiosum. T. atopovirilia obtained 70.14% parasitism while T. pretiosum, 29.23%. In field cages, three doses of the parasitoids were tested. Total parasitism did not exceed 8% in any of the two species, but T. atopovirilia parasitized a greater number of hosts using two and three parasitoids per pest egg. Then, the use of Trichogramma species needs to be reevaluated in biological control programs against S. frugiperda.
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Affiliation(s)
- Jannet Jaraleño-Teniente
- Posgrado en Fitosanidad-Entomología y Acarología, Colegio de Postgraduados, Estado de México, 56230 Texcoco, Mexico; (J.J.-T.); (E.R.-L.); (S.E.R.-R.)
| | - J. Refugio Lomeli-Flores
- Posgrado en Fitosanidad-Entomología y Acarología, Colegio de Postgraduados, Estado de México, 56230 Texcoco, Mexico; (J.J.-T.); (E.R.-L.); (S.E.R.-R.)
- Correspondence: ; Tel.: +52-5527-276-196
| | - Esteban Rodríguez-Leyva
- Posgrado en Fitosanidad-Entomología y Acarología, Colegio de Postgraduados, Estado de México, 56230 Texcoco, Mexico; (J.J.-T.); (E.R.-L.); (S.E.R.-R.)
| | - Rafael Bujanos-Muñiz
- Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP), Campo Experimental Bajío, Guanajuato, 38010 Celaya, Mexico;
| | - Susana E. Rodríguez-Rodríguez
- Posgrado en Fitosanidad-Entomología y Acarología, Colegio de Postgraduados, Estado de México, 56230 Texcoco, Mexico; (J.J.-T.); (E.R.-L.); (S.E.R.-R.)
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Ning SF, Zhou JC, Liu QQ, Zhao Q, Dong H. Gradual, temperature-induced change of secondary sexual characteristics in Trichogramma pretiosum infected with parthenogenesis-inducing Wolbachia. PeerJ 2019; 7:e7567. [PMID: 31497407 PMCID: PMC6709661 DOI: 10.7717/peerj.7567] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Accepted: 07/29/2019] [Indexed: 01/29/2023] Open
Abstract
Intersex is an intermediate stage of sexual differentiation in insects. Determining intersex morphology and the cause of its production will aid in the understanding of the mechanism of sexual differentiation in insects. In this paper, Wolbachia-infected Trichogramma pretiosum (T. preW+ ) that shows thelytokous parthenogenesis were used as subjects. In order to determine the causes of the T. preW+ intersex and the influence of parental generation temperature on gradual changes in secondary masculinization in intersex offspring, we examined the occurrence of intersex offspring (F1 and F2 generation) after the parental generations were treated with high temperature (27, 29, 31, and 33 °C) and described the external morphology of the intersexes. The results showed that the T. preW+ parental generation temperature is positively correlated with the probability of intersex offspring. The probability of F1 intersex is significantly higher than that of F2 intersex in different high temperature. The degree of secondary masculinization in T. preW+ intersexes increases as parental generation temperature increases. In addition, our study first identified 11 intersex types in T. preW+ and found that the primary and secondary sexual characteristics showed a regular distribution. We also found that the D type and H type of intersex have the highest frequency of appearance. The external genitalia of most intersexes were female, and only three intersex types have male external genitalia. Conclusions were ultimately obtained: Wolbachia is a direct factor that causes the occurrence of intersexes, while high temperature is an indirect factor that determines the external morphology of intersexes. The effects of high temperature on T. preW+ intersexes is passed through the parental generation to offspring, and this maternal effect weakens as the number of generations increases. In T. preW+ intersex individuals, most exhibit female primary sexual characteristics, and secondary sexual characteristics exhibit signs of masculinization.
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Affiliation(s)
- Su-Fang Ning
- College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Jin-Cheng Zhou
- College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Quan-Quan Liu
- College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Qian Zhao
- College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Hui Dong
- College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, China
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Khan MA, Ruberson JR. Lethal effects of selected novel pesticides on immature stages of Trichogramma pretiosum (Hymenoptera: Trichogrammatidae). Pest Manag Sci 2017; 73:2465-2472. [PMID: 28600808 DOI: 10.1002/ps.4639] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 05/08/2017] [Accepted: 06/06/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Trichogramma pretiosum Riley is an important egg parasitoid and biological control agent of caterpillar pests. We studied the acute toxicity of 20 pesticides (14 insecticides/miticides, three fungicides and three herbicides) exposed to recommended field rates. Egg, larval, and pupal stages of the parasitoid in their hosts were dipped in formulated solutions of the pesticides and evaluated 10 days later for percentage of host eggs with holes, number of parasitoids emerged per egg with holes, and stage-specific mortality of immature as well as adult wasps within the host eggs. RESULTS Seven insecticides (buprofezin, chlorantraniliprole, spirotetramat, flonicamid, flubendiamide) and miticides (spiromesifen, cyflumetofen), one herbicide (nicosulfuron), and three fungicides (myclobutanil, pyraclostrobin, trifloxystrobin + tebuconazole) caused no significant mortality to immature stages or pre-emergent adult parasitoids relative to controls. By contrast, seven insecticides/miticides (abamectin, acetamiprid, dinotefuran, fipronil, novaluron, spinetoram, tolfenpyrad) adversely affected immature and pre-emergent adult T. pretiosum, with tolfenpyrad being particularly lethal. Two herbicides had moderate (glufosinate ammonium) to severe (s-metolachlor) acute lethal effects on the immature parasitoids. CONCLUSIONS This study corroborates earlier findings with adult T. pretiosum. Over half of the pesticides - and all the fungicides - tested in the current study would appear to be compatible with the use of T. pretiosum in integrated pest management programs, with respect to acute parasitoid mortality. © 2017 Society of Chemical Industry.
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Affiliation(s)
| | - John R Ruberson
- Department of Entomology, Kansas State University, Manhattan, Kansas, USA
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DaSilva CSB, Morelli R, Parra JRP. Effects of Self-Superparasitism and Temperature on Biological Traits of Two Neotropical Trichogramma (Hymenoptera: Trichogrammatidae) Species. J Econ Entomol 2016; 109:1555-1563. [PMID: 27354510 DOI: 10.1093/jee/tow126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Accepted: 05/14/2016] [Indexed: 06/06/2023]
Abstract
It is common for a female trichogrammatid to lay more than one egg per host, a phenomenon known as self-superparasitism, which exposes her offspring to intraspecific, intrinsic competition (IIC) with its own siblings. Information about how often self-superparasitism occurs and how IIC interacts with abiotic factors is rare, especially regarding the Neotropical Trichogramma species. Here we determined the frequency of self-superparasitism in Trichogramma atopovirilia Oatman & Platner (Ta) and T. pretiosum Riley (Tp), and the effects of IIC and temperature on the sex ratio, egg-to-adulthood period, and survivorship of both species' offspring. Individual females were offered eggs of Spodoptera frugiperda (J.E. Smith) for 30 min. A group of parasitized hosts was then dissected for determination of the self-superparasitism frequency, while another group was incubated at 15, 18, 21, 24, 27, 30, and 33°C. High rates of self-superparasitism were found in both Ta (0.55 ± 0.07) and Tp (0.62 ± 0.06). IIC interacted with temperature decreasing Ta and Tp's survivorship, lengthening the egg-to-adulthood period in Tp and shortening it in Ta, and balancing Ta's sex ratio. Based on survivorship rate, Ta and Tp could not be differentiated if their immatures develop in absence of IIC. However, in its presence, Tp was 3 × more likely to survive than Ta at 33°C, while at 15°C Ta survived 2× better than Tp These results show that self-superparasitism can be very common in both Ta and Tp, and that its effects on the species' biological traits and competitiveness strongly depend on the IIC-temperature interaction.
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Affiliation(s)
- C S B DaSilva
- Laboratório de Biologia de Insetos, Departamento de Entomologia e Acarologia, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo. Address: Av. Pádua Dias, 11, Piracicaba-SP, Brazil, 13418-900 (; ), Corresponding author, e-mail: , and
| | - Renata Morelli
- Laboratório de Ecologia Química e Comportamento de Insetos, Departamento de Entomologia e Acarologia, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo. Address: Av. Pádua Dias, 11, Piracicaba-SP, Brazil, 13418-900
| | - J R P Parra
- Laboratório de Biologia de Insetos, Departamento de Entomologia e Acarologia, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo. Address: Av. Pádua Dias, 11, Piracicaba-SP, Brazil, 13418-900 (; )
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Khan MA, Khan H, Ruberson JR. Lethal and behavioral effects of selected novel pesticides on adults of Trichogramma pretiosum (Hymenoptera: Trichogrammatidae). Pest Manag Sci 2015; 71:1640-1648. [PMID: 25580715 DOI: 10.1002/ps.3972] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Revised: 12/01/2014] [Accepted: 12/24/2014] [Indexed: 06/04/2023]
Abstract
BACKGROUND Growing demand for reduced chemical inputs in agricultural systems requires more effective integration of biological control with pesticides. The egg parasitoid Trichogramma pretiosum Riley is an important natural enemy of lepidopteran pests, used in biological control. In an investigation of the interaction of T. pretiosum and pesticides, we studied the acute toxicity of 19 pesticides (insecticides, miticides, fungicides and herbicides) to adult parasitoids and the behavioral effects of 11 pesticides on foraging parasitoid females, including host antennation, stinging and host feeding. RESULTS At recommended field doses, fipronil, dinotefuran, spinetoram, tolfenpyrad and abamectin induced nearly 100% adult mortality within 24 h of exposure to treated cotton leaves by comparison with controls. Acetamiprid was also toxic, but significantly less so than the former materials. The other pesticides had no significant toxic effects. Only glufosinate ammonium exhibited increased toxicity among the non-toxic materials when increased two- or fourfold over recommended rates. The foraging behavior of parasitoids was affected only by tolfenpyrad among the materials tested. CONCLUSION Most novel pesticides, except for several insecticides, exhibited little to no acute toxicity to the parasitoid. Parasitoid foraging behavior was only affected by tolfenpyrad, indicating that parasitoids could successfully forage on eggs treated with most pesticides evaluated. Therefore, many of these pesticides may have good compatibility with Trichogramma.
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Affiliation(s)
- Muhammad Ashraf Khan
- Department of Environmental Sciences, University of Peshawar, Peshawar, Pakistan
| | - Hizbullah Khan
- Department of Environmental Sciences, University of Peshawar, Peshawar, Pakistan
| | - John R Ruberson
- Department of Entomology, Kansas State University, Manhattan, KS, USA
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