107(4)_str46

ISSN 1392-3196 / e-ISSN 2335-8947
Zemdirbyste-Agriculture, vol. 107, No. 4 (2020), p. 359–366
DOI  10.13080/z-a.2020.107.046

The correlation between the susceptibilities to lambda-cyhalothrin and tau-fluvalinate in Czech and Slovak pollen beetle populations

Marek SEIDENGLANZ, Romana BAJEROVÁ, Pavel KOLAŘÍK, Eva HRUDOVÁ, Jiří HAVEL, Ján TÁNCIK, Miriama RUSEŇÁKOVÁ, Peter BOKOR, František KOCOUREK, Jitka STARÁ, Leona VÍCHOVÁ, Jaroslav ŠAFÁŘ

Abstract

A total of 251 pollen beetle (Brassicogethes aeneus F.) populations sampled in the Czech Republic and Slovakia were tested against both lambda-cyhalothrin and tau-fluvalinate by means of Insecticide Resistance Action Committee (IRAC) susceptibility test method 11, version 03 (glass vial test) over four (2015–2018) years. The results confirmed high levels of resistance to lambda-cyhalothrin in the pollen beetle populations of both countries. Tau-fluvalinate is less affected by resistance, but relatively high proportions of resistant populations at many localities in both countries make this insecticide almost unusable against the pest too. The results of a correlation analysis of lethal concentration (LC) values (LC₅₀ and at least partly of LC₉₀ values, too) indicate a moderate level of cross resistance against the two active ingredients in Czech populations. In Slovakian populations, the positive correlation between the LC₅₀ values proved to be significant only in 2018 (r = 0.66, p < 0.001).

Despite certain variability in the results of the correlation analysis recorded in this study, the findings indicate another possible decrease in the susceptibility of pollen beetles to pyrethroids, in general, if tau-fluvalinate were used for their control under field conditions.

Key words: Brassicogethes aeneus, class I pyrethroids, class II pyrethroids, adult vial test, insecticide resistance, winter oilseed rape.

Full text: 107_4_str46.pdf