Abstract
Ecological hypotheses of plant–insect herbivore interactions suggest that insects perform better on weakened plants and plants grown under optimal conditions are less damaged. This study tested the hypothesis that the colonization and oviposition rates by pests with different feeding strategies and levels of specialization are affected in different ways by two conditions commonly faced by commercially grown plants–water deficit and application of kaolin sprays, a reducer of abiotic plant stressors. We used four major pests of cotton as insect herbivore models. Three were chewing Lepidoptera: Alabama argillacea (Hüb.), a monophagous pest on cotton; Heliothis virescens (Fabr.), which is polyphagous, but with cotton as a primary host; and Chrysodeixis includens (Walk.), which is polyphagous, with cotton as secondary host. The fourth pest was a sap-sucking species, the polyphagous whitefly Bemisia tabaci (Gen.). In both choice and no-choice trials, the three chewing pests oviposited significantly less upon water-stressed plants; the greatest effect was observed for C. includens (>90 % reduction in oviposition under choice and >58 % under no-choice conditions). In contrast, the sap-sucking B. tabaci exhibited statistically more colonization and oviposition on water-stressed plants. Application of kaolin sprays reduced colonization and oviposition by all herbivore species tested, irrespective of irrigation regime and feeding strategies.
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Acknowledgments
This research was partially supported by the agencies “Fundação de Amparo a Ciência e Tecnologia do Estado de Pernambuco (FACEPE)” project APQ-0168-5.01/15; by “Coordenação de Aperfeiçoamento de Pessoal de Nível Superior” (CAPES)” with grant to LRB; and by “Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)” with grants to RBBS and JBT, special thanks to Dr. Janice Matthews and Robert Matthews (University of Georgia, USA) for their comments and suggestions on the manuscript.
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Bestete, L.R., Torres, J.B., Silva, R.B.B. et al. Water stress and kaolin spray affect herbivorous insects’ success on cotton. Arthropod-Plant Interactions 10, 445–453 (2016). https://doi.org/10.1007/s11829-016-9454-8
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DOI: https://doi.org/10.1007/s11829-016-9454-8