Experiences in controlling common cockchafer (Melolontha melolontha l.) in Idrija region | Izkusnje pri zatiranju poljskega majskega hrosca (Melolontha melolontha L.) na Idrijskem
2007
Pozenel, A., Goriska c. 23b, 5270 Ajdovscina (Slovenia)
During 2002 and 2006 a great increase of population of common cockchafer (Melolontha melolontha L.) was observed in Idrija region in Slovenia. In 2002 and 2003 the third larval stage of cockchafer by average of 100 grubs per m2 completely damaged 370 ha of grasslands. In 2004 damage was caused by adult cockchafer. After eggs deposition the population increased on 200 grubs per m2. The grass was damaged up to 50 % by the grubs of the first larval stage. In 2005 an average of 226 grubs per m2 was observed in region. 760 ha of grasslands were damaged, that represents 62 % of all agricultural land in the region. Different methods (mechanical, biological and chemical treatments) were used to reduce the population of the pest, but they were only partly successful. In the June 2005 92 ha of grasslands were treated by Beauveria brongniartii. The efficiency of B. brongniartii was 38.7 %. The total decrease in number of grubs on treated area was 88.2 %.
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