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VCRB :: Contents of Volume 52/2000 :: Detailed information


SOME ECOLOGICAL PECULIARITIES OF THE DIAMOND BACK MOTH (PLUTELLA MACULIPENNIS CURT.) POPULATION DEVELOPMENT

Vikenty SIDLYAREVICH and Vasily LAMEKO
Byelorussian Scientific-Research Institute of Plant Protection 223011, Minsk region, p/o Priluki, Minsk (Belarus)


Summary

The diamond back moth (Plutella maculipennis) is one of the most destructive pests of cabbage crops in Belarus. The systematic ten years long field and laboratory observations and experiments on the factors responsible for the outbreaks of the important pest were carried out on commercial cabbage fields in selected five regions of Belarus. It was confirmed that the pest develops 3-4 generations annually in this climatic zone. The pest outbreaks were noticed in the following growing seasons: 1988-1991, 1997 and 1998. The analysis of numerous data collected from the rearing of field sampled pest caterpillars and pupae has shown that the parasitic wasp Diadegma fenustralis constituted the major parasitoid species attacking the diamond back moth larvae. This parasitoid is therefore presently considered as the most important natural enemy involved in the effective regulation of the P. maculipennis populations under field conditions. The damage percentage of cabbage field crops has varied between 4-100% during the 1991-1995 period. It was also demonstrated that by the supervised control of the diamond back moth by regular monitoring of the occurrence of the Diadegma parasitoid in the population of caterpilars, reduction by 2-3 times in the number of insecticide treatments was possible. Consequently crops grown in accordance with the ecological principles were obtained.

keywords:diamond back moth, Plutella maculipennis, Diadegma fenestralis

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