First results of monitoring the occurrence of resistant pollen beetles (Meligethes aeneus, Fabricius 1775) in the Czech Republic (2013)

Significant differences among reactions of the pollen beetles originated from the fifteen compared localities to lambda-cyhalothrin applied in 100% rate (ANOVA for the counts after 5 hours : F = 4,450; df = 14, 28; Ftab = 2,726; P = 0,01). The differences in the lambda-cyhalothrin effectiveness expressed in according to Abbott exceeded 50 per cents among the several localities. On the contrary there were not found out any significant differences among the reactions of the pollen beetles originated from the five compared localities to the etofenprox applied in 100% rate (ANOVA for the counts after 5 hours : F = 0,748; df = 4, 8; Ftab = 3,838; P = 0,05). The differences in the etofenprox effectiveness expressed in according to Abbott (and in the pollen beetles mortalities) were minor on the compared localities. On the base of other analysis it is also possible to conclude that the localities where the beetles showed significantly different reactions to the lambda-cyhalothrin were not different in this aspect concerning the etofenprox.

IOBC-WPRS Bulletin Vol. 92, 2013 Working Group "Integrated Control in Oilseed Crops". Proceedings of the meeting at FIAP, Paris (France), 29 September - 01 October, 2008. Editors: Birger Koopmann, Samantha Cook, Neal Evans and Bernd Ulber. ISBN 978-92-9067-271-5 [XIII + 218 pp.]   Klíčová slova: Meligethes aeneus; insecticide resistance; lambda-cyhalothrin; etofenprox; Adult vial test IRAC no. 011