engleski

Control of Colorado potato beetle with spinosad and metaflumizone – one of the few insecticides available on the market in Croatia.

Colorado potato beetle (CPB) is a serious pest of potato worldwide, which became difficult to control due to resistance developed to many classes of inseciticides. In Croatia, resistance to organophosphorus insecticides and pyrethroids was established in mid 1990s, and recent research has shown that it has developed resistance to newer generation insecticides (e.g. neonicotinoids) in some areas. Due to the resistance development and restrictions on the registration and use of plant protection products in the EU as well as in Croatia, the spectrum of available insecticides for CPB control is limited. Efficacy of spinosad and metaflumizone was investigated in laboratory bioassays on 35 populations collected from 2017-2019 in Croatia. Efficiency of recommended dose, half, 1/5 and 1/10 of the recommended dose were determined. Populations were classified according to IRAC method No. 1132 into five categories based on the efficacy. Efficacy data were subjected to Probit analysis to generate LC50 estimates for each insecticide and population 48 and 72 hours after the treatment. Results have showed that all populations are susceptible or highly susceptible to spinosad and metaflumizone. However, the differences among populations in LC50 have been established, indicating that at some locations resistance development is in progress. Due to the limited availability of insecticides for CPB control, spinosad and metaflumizon could be recommended in areas where CPB developed resistance to other classes of insecticides. But, the monitoring of the resistance development to these active ingredients is required

bioassay, Leptinotarsa decemlineata, metaflumizone, resistance, spinosad

nije evidentirano