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Bryant TB, Greene JK, Reay-Jones FPF. Competition between brown stink bug (Hemiptera: Pentatomidae) and corn earworm (Lepidoptera: Noctuidae) in field corn. ENVIRONMENTAL ENTOMOLOGY 2024:nvae065. [PMID: 38965911 DOI: 10.1093/ee/nvae065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2024] [Revised: 06/06/2024] [Accepted: 06/18/2024] [Indexed: 07/06/2024]
Abstract
Interspecific competition is an important ecological concept which can play a major role in insect population dynamics. In the southeastern United States, a complex of stink bugs (Hemiptera: Pentatomidae), primarily the brown stink bug, Euschistus servus (Say), and corn earworm, Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae), are the 2 most common pests of field corn, Zea mays L. (Poales: Poaceae). Stink bugs have the greatest potential for economic injury during the late stages of vegetative corn development when feeding can result in deformed or "banana-shaped" ears and reduced grain yield. Corn earworm moths lay eggs on corn silks during the first stages of reproductive development. A 2-year field study was conducted to determine the impact of feeding by the brown stink bug during late-vegetative stages on subsequent corn earworm oviposition, larval infestations, and grain yield. Brown stink bug feeding prior to tasseling caused deformed ears and reduced overall grain yield by up to 92%. Across all trials, varying levels of brown stink bug density and injury reduced the number of corn earworm larvae by 29-100% and larval feeding by 46-85%. Averaged across brown stink bug densities, later planted corn experienced a 9-fold increase in number of corn earworm larvae. This is the first study demonstrating a competitive interaction between these major pests in a field corn setting, and these results have potential implications for insect resistance management.
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Affiliation(s)
- Tim B Bryant
- Department of Plant and Environmental Sciences, Pee Dee Research and Education Center, Clemson University, Florence, SC, USA
| | - Jeremy K Greene
- Department of Plant and Environmental Sciences, Edisto Research and Education Center, Clemson University, Blackville, SC, USA
| | - Francis P F Reay-Jones
- Department of Plant and Environmental Sciences, Pee Dee Research and Education Center, Clemson University, Florence, SC, USA
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Qin H, Hong W, Qi Z, Hu Y, Shi R, Wang S, Wang Y, Zhou J, Mu D, Fu J, Sun T. A Temperature-Dependent Model for Tritrophic Interactions Involving Tea Plants, Tea Green Leafhoppers and Natural Enemies. INSECTS 2022; 13:insects13080686. [PMID: 36005311 PMCID: PMC9409375 DOI: 10.3390/insects13080686] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 07/26/2022] [Accepted: 07/26/2022] [Indexed: 11/16/2022]
Abstract
The tea green leaf hopper, Empoasca onukii Matsuda, is a severe pest of tea plants. Volatile emissions from tea shoots infested by the tea green leafhopper may directly repel insect feeding or attract natural enemies. Many studies have been conducted on various aspects of the tritrophic relationship involving tea plants, tea green leafhoppers and natural enemies. However, mathematic models which could explain the dynamic mechanisms of this tritrophic interaction are still lacking. In the current work, we constructed a realistic and stochastic model with temperature-dependent features to characterize the tritrophic interactions in the tea agroecosystem. Model outputs showed that two leafhopper outbreaks occur in a year, with their features being consistent with field observations. Simulations showed that daily average effective accumulated temperature (EAT) might be an important metric for outbreak prediction. We also showed that application of slow-releasing semiochemicals, as either repellents or attractants, may be highly efficacious for pest biocontrol and can significantly increase tea yields. Furthermore, the start date of applying semiochemicals can be optimized to effectively increase tea yields. The current model qualitatively characterizes key features of the tritrophic interactions and provides critical insight into pest control in tea ecosystems.
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Affiliation(s)
- Huaguang Qin
- The Province Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest Anhui, School of Life Sciences, Anqing Normal University, Anqing 246133, China; (H.Q.); (W.H.); (Z.Q.); (Y.H.); (R.S.); (S.W.); (Y.W.); (D.M.)
| | - Wuxuan Hong
- The Province Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest Anhui, School of Life Sciences, Anqing Normal University, Anqing 246133, China; (H.Q.); (W.H.); (Z.Q.); (Y.H.); (R.S.); (S.W.); (Y.W.); (D.M.)
| | - Zehua Qi
- The Province Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest Anhui, School of Life Sciences, Anqing Normal University, Anqing 246133, China; (H.Q.); (W.H.); (Z.Q.); (Y.H.); (R.S.); (S.W.); (Y.W.); (D.M.)
| | - Yinghong Hu
- The Province Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest Anhui, School of Life Sciences, Anqing Normal University, Anqing 246133, China; (H.Q.); (W.H.); (Z.Q.); (Y.H.); (R.S.); (S.W.); (Y.W.); (D.M.)
| | - Rui Shi
- The Province Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest Anhui, School of Life Sciences, Anqing Normal University, Anqing 246133, China; (H.Q.); (W.H.); (Z.Q.); (Y.H.); (R.S.); (S.W.); (Y.W.); (D.M.)
| | - Shuyuan Wang
- The Province Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest Anhui, School of Life Sciences, Anqing Normal University, Anqing 246133, China; (H.Q.); (W.H.); (Z.Q.); (Y.H.); (R.S.); (S.W.); (Y.W.); (D.M.)
| | - Yuxi Wang
- The Province Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest Anhui, School of Life Sciences, Anqing Normal University, Anqing 246133, China; (H.Q.); (W.H.); (Z.Q.); (Y.H.); (R.S.); (S.W.); (Y.W.); (D.M.)
| | - Jianping Zhou
- Wanxinan Products Quality Supervision and Testing Center, Anqing 246052, China;
| | - Dan Mu
- The Province Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest Anhui, School of Life Sciences, Anqing Normal University, Anqing 246133, China; (H.Q.); (W.H.); (Z.Q.); (Y.H.); (R.S.); (S.W.); (Y.W.); (D.M.)
| | - Jianyu Fu
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China
- Correspondence: (J.F.); (T.S.)
| | - Tingzhe Sun
- The Province Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest Anhui, School of Life Sciences, Anqing Normal University, Anqing 246133, China; (H.Q.); (W.H.); (Z.Q.); (Y.H.); (R.S.); (S.W.); (Y.W.); (D.M.)
- Correspondence: (J.F.); (T.S.)
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