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Does feeding on pollen grains affect the performance of Amblyseius swirskii (Acari: Phytoseiidae) during subsequent generations?

Published online by Cambridge University Press:  09 December 2019

Alireza Nemati*
Affiliation:
Department of Plant Protection, Faculty of Agriculture, Shahrekord University, Shahrekord, Iran Biotechnology Research Institute, Shahrekord University, Shahrekord, Iran
Elham Riahi
Affiliation:
Department of Plant Protection, Faculty of Agriculture, Shahrekord University, Shahrekord, Iran
*
Author for correspondence: Alireza Nemati, Email: Alireza.nemat@ymail.com

Abstract

Diet is a critical component of the mass-rearing of biological control agents, but the impacts of diet are not always immediately obvious and can take several generations to manifest, resulting in poor survival, reproduction, and ability to kill prey under natural conditions. Our present study aimed to investigate the performance of a commercially-reared phytoseiid mite, Amblyseius swirskii, after four (G4) and six (G6) consecutive generations on pollen grains of two plant species, as well as its ability to find and kill its natural prey, Tetranychus urticae, after long-term rearing on each diet. We found no significant difference between the two diets in intrinsic and finite rates in G4. However, both diet and generation exerted a significant influence on the fecundity of A. swirskii. By G6, females reared on almond pollen had greater net reproductive and intrinsic rate compared to those reared on maize pollen. Conversely, A. swirskii fed on maize pollen consumed fewer prey than those reared on other diets, especially at higher prey densities. The findings have important implications for developing the mass-rearing program of A. swirskii on non-prey diets. Further research must explore the suitability of almond pollen in the large-scale culture of A. swirskii.

Type
Research Paper
Copyright
Copyright © Cambridge University Press 2019

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