Results of collecting Collembola, Coleoptera and Diptera in stands sprayed with inhibitors of chitin synthesis
The impact of application of diflubenzuron, teflubenzuron and nova- luron against leaf-eating insects on epigeic entomofauna has been assessed.
The research was done in 2001-2003 in 20-60 year old stands of Pinus sylvestris L. of the same site-type (moderately humid soil pine forest – Bśw), and at the same time threatened by nunmoth Lymantria monacha L., pine caterpillar Dendrolimus pini L. and pine beauty moth Panolis flammea Den. et Schiff. In 2001 six study plots, of ca. 100 ha each, were sprayed with Dimilin 480 SC, Nomolt 150 SC and Rimon 100 EC. Each insecticide was applied in two doses. For three years on each sprayed and (one) control plot 10 Barber’s traps were set up and then controlled five times, at one month intervals, throughout the vegetation season.
The numbers of Collembola and Diptera captured in Barber’s traps in 2001-2003 show that, irrespective of the applied insecticides, as well on sprayed plots as on the control, in the second and third year after the treatment the abundance of representatives of these orders increased.
As to Coleoptera, considerable increase in 2. year after treatment was followed by decrease in the third year; these fluctuations were of the same character on sprayed and control plots and were probably caused by changes in abundance of prey – foliophagous insects.
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