Effect of Plant Secondary Compounds on Susceptibility of Insects to Entomopathogenic Microorganisms
B. A. DUISEMBECOV1, I. M. DUBOVSKIY2, V. V. GLUPOV2
1Zh. Zhieembaev Kazakh Research Institute for Plant Protection and Quarantine, 050070, Almaty, Kazybek bi str., 1
2Institute of Systematics and Ecology of Animals, SB RAS, 630091, Novosibirsk, Frunse str., 11
Keywords: экстракты, олений мох, колорадский жук, резистентность, Metarhizium, усниновая кислота, непарный шелкопряд, вощинная огневка, extracts, reindeer lichen, Colorado potato beetle, resistance, Metarhizium, usnic acid, gypsy moth, wax moth
Abstract
The effect of plant extracts on susceptibility of several insect’ species to enthomopathogenic microorganisms has been studied. We found that greater wax moth Galleria mellonella weight decreased by 30-50 % under polar and nonpolar extracts of ledum and reindeer lichen treatments. Сrude extract of hemlock enhanced growth rate of larvae by 30 %. Treatment with extract of reindeer lichen led to synergy with virus in gypsy moth Lymantria dispar mortality and with fungal infection in wax moth mortality. It has been established that the main components of the extract are perlatolikovy acid, usnic acid, and also the third component of unknown chemical group. Usnic acid is the main promising additive component to entomopathogenic microorganisms. Treatment by usnic acid led to increase of both colorado potato beetle Leptinotarsa decemlineata and greater wax moth larvae mortality after infection with entomopathogenic fungi Metarhizium robertsii and Beauveria bassianа. The maximum effect was shown only with whole extract because of summation of action of each of extract components, or for the reason that components could change the properties in presence of other components of the whole extract.
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