A functional response evaluation of pre-infestation with Bemisia tabaci cryptic species MEAM1 on predation by Propylea japonica of Myzus persicae on host plant tomatoes
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Herbivore feeding on host plants may induce defense responses of the plant which influence other herbivores and interacting species in the vicinity, such as natural enemies. The present work evaluated the impact of pre-infestation with the tobacco whitefly Bemisia tabaci cryptic species MEAM 1, on the predation ability of the ladybird Propylea japonica, to the green peach aphid Myzus persicae, on tomato plants. The results show that B. tabaci pre-infestation density, duration, and leaf position, can impact prey consumed by P. japonica under various aphid densities. The aphids consumed by P. japonica in each treatment were fit using the Holling type II functional response equation. The predatory efficiency (a/T h) of P. japonica was the highest in the treatment with 60 aphids and 48-h infestation directly on damaged leaves. The predatory efficiencies of P. japonica decreased with a reduction of pre-infestation density and duration. We also observed that pre-infestation on young and undamaged leaves increased predation by P. japonica.
KeywordsInduced defense Infestation density Infestation duration Systemic defense Functional response
Support of this research was from the following Grants: the National Natural Science Foundation of China (NO. 31272089), National Basic Research Program of China (973 Project No. 2013CB127600), Beijing Technology Program (D171100001617003) and Youth Science Foundation, Beijing Academy of Agriculture and Forestry Sciences (No. qnjj201410). We are grateful for the assistance of all staff and students in the Key Laboratory of Applied Entomology, Northwest A&F University at Yangling, Shaanxi, China.
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