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Sarker S, Choi HW, Lim UT. Evaluation of new strain (AAD16) of Beauveria bassiana recovered from Japanese rhinoceros beetle: Effects on three coleopteran insects. PLoS One 2024; 19:e0296094. [PMID: 38198474 PMCID: PMC10781193 DOI: 10.1371/journal.pone.0296094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 12/05/2023] [Indexed: 01/12/2024] Open
Abstract
A strain (AAD16) of the entomopathogenic fungus Beauveria bassiana (Balsamo) Vuillemin was isolated from field-collected Japanese rhinoceros beetle, Allomyrina dichotoma (L.) (Coleoptera: Scarabaeidae). Its virulence was compared with another strain (ARP14) recovered from a cadaver of Riptortus pedestris (F.) (Hemiptera: Alydidae) focusing on its effect on three coleopteran, i.e., Tenebrio molitor L., A. dichotoma, and Monochamus alternatus Hope. The LT50 value of T. molitor for two larval sizes, i.e., 16-18 and 22-24 mm, was 15.3 and 19.4% lower for strain AAD16 compared to strain ARP14, respectively. Furthermore, after 8 and 10 days of exposure, the mycosis rate of strain AAD16 was 1.3 and 1.2 times higher than that of strain ARP14 in the 16-18 and 22-24 mm larval sizes, respectively. The LT50 for M. alternatus larvae was 23.2% lower on strain AAD16 than on strain ARP14. In addition, the LT50 for M. alternatus adults was 47.1% lower for strain AAD16 compared to control. The mycosis rate of strain AAD16 on M. alternatus larvae was 1.8 higher than that of strain ARP14 after 120 hours of exposure. The strain AAD16 also showed higher larval mortality (90%) for A. dichotoma compared to strain ARP14 (45.0%) at 28 days after exposure. These results suggest that B. bassiana AAD16 can be a potential biological control agent against coleopteran pests.
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Affiliation(s)
- Souvic Sarker
- Department of Entomology, Rutgers University, New Brunswick, New Jersey, United States of America
| | - Hyong Woo Choi
- Department of Plant Medicals, Andong National University, Andong, Republic of Korea
| | - Un Taek Lim
- Department of Plant Medicals, Andong National University, Andong, Republic of Korea
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Wu S, Wu J, Wang Y, Qu Y, He Y, Wang J, Cheng J, Zhang L, Cheng C. Discovery of entomopathogenic fungi across geographical regions in southern China on pine sawyer beetle Monochamus alternatus and implication for multi-pathogen vectoring potential of this beetle. FRONTIERS IN PLANT SCIENCE 2022; 13:1061520. [PMID: 36643293 PMCID: PMC9832029 DOI: 10.3389/fpls.2022.1061520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Accepted: 11/28/2022] [Indexed: 06/17/2023]
Abstract
Entomopathogen-based biocontrol is crucial for blocking the transmission of vector-borne diseases; however, few cross-latitudinal investigations of entomopathogens have been reported for vectors transmitting woody plant diseases in forest ecosystems. The pine sawyer beetle Monochamus alternatus is an important wood borer and a major vector transmitting pine wilt disease, facilitating invasion of the pinewood nematode Bursaphelenchus xylophilus (PWN) in China. Due to the limited geographical breadth of sampling regions, species diversity of fungal associates (especially entomopathogenic fungi) on M. alternatus adults and their potential ecological functions have been markedly underestimated. In this study, through traditional fungal isolation with morphological and molecular identification, 640 fungal strains (affiliated with 15 genera and 39 species) were isolated from 81 beetle cadavers covered by mycelia or those symptomatically alive across five regional populations of this pest in southern China. Multivariate analyses revealed significant differences in the fungal community composition among geographical populations of M. alternatus, presenting regionalized characteristics, whereas no significant differences were found in fungal composition between beetle genders or among body positions. Four region-representative fungi, namely, Lecanicillium attenuatum (Zhejiang), Aspergillus austwickii (Sichuan), Scopulariopsis alboflavescens (Fujian), and A. ruber (Guangxi), as well as the three fungal species Beauveria bassiana, Penicillium citrinum, and Trichoderma dorotheae, showed significantly stronger entomopathogenic activities than other fungi. Additionally, insect-parasitic entomopathogenic fungi (A. austwickii, B. bassiana, L. attenuatum, and S. alboflavescens) exhibited less to no obvious phytopathogenic activities on the host pine Pinus massoniana, whereas P. citrinum, Purpureocillium lilacinum, and certain species of Fusarium spp.-isolated from M. alternatus body surfaces-exhibited remarkably higher phytopathogenicity. Our results provide a broader view of the entomopathogenic fungal community on the vector beetle M. alternatus, some of which are reported for the first time on Monochamus spp. in China. Moreover, this beetle might be more highly-risk in pine forests than previously considered, as a potential multi-pathogen vector of both PWN and phytopathogenic fungi.
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Affiliation(s)
- Shengxin Wu
- School of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou, Zhejiang, China
- Key Laboratory of Vector Biology and Pathogen Control of Zhejiang Province, Huzhou University, Huzhou, Zhejiang, China
| | - Jia Wu
- Station of Forest Pest Control, Anji Forestry Bureau, Huzhou, Zhejiang, China
| | - Yun Wang
- Key Laboratory of Vector Biology and Pathogen Control of Zhejiang Province, Huzhou University, Huzhou, Zhejiang, China
| | - Yifei Qu
- School of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou, Zhejiang, China
- Key Laboratory of Vector Biology and Pathogen Control of Zhejiang Province, Huzhou University, Huzhou, Zhejiang, China
| | - Yao He
- Key Laboratory of Vector Biology and Pathogen Control of Zhejiang Province, Huzhou University, Huzhou, Zhejiang, China
| | - Jingyan Wang
- Key Laboratory of Vector Biology and Pathogen Control of Zhejiang Province, Huzhou University, Huzhou, Zhejiang, China
| | - Jianhui Cheng
- Key Laboratory of Vector Biology and Pathogen Control of Zhejiang Province, Huzhou University, Huzhou, Zhejiang, China
| | - Liqin Zhang
- School of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou, Zhejiang, China
- Key Laboratory of Vector Biology and Pathogen Control of Zhejiang Province, Huzhou University, Huzhou, Zhejiang, China
| | - Chihang Cheng
- Key Laboratory of Vector Biology and Pathogen Control of Zhejiang Province, Huzhou University, Huzhou, Zhejiang, China
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