Enhancing biocontrol potential of Trichogramma chilonis against borer pests of wheat and chickpea.

Abstract

Communication between plants and herbivores occur mostly through chemicals. Plants emit volatiles in response to the attack of herbivores called herbivore-induced plant volatiles (HIPVs), which are employed by the plants to attract their herbivores' natural enemies. Promising HIPVs when used in the form of controlled release formulations under field conditions can act as arrestants of released or wild population of parasitoids to spend comparatively more time in searching of various stages of herbivores; thus management of crop pests is enhanced. Gel formulation of octadecane (Saturated hydrocarbon) when applied 24h after release of Trichogramma chilonis in wheat and chickpea enhanced the foraging activity against pink stem borer (Sesamia inferens) and pod borer (Helicoverpa armigera), respectively resulting in reduced symptoms and increased grain yields. Controlled release formulations of promising plant volatile organic compounds (pVOCs) can be useful to augment and enhance foraging activity of natural enemies against crop herbivores.