Toxicity of some insecticides against the oriental hornet Vespa orientalis (Hymenoptera : Vespidae)‎

الملخص EN

The present investigations were carried out at the laboratory of Shandaweel Agricultural Research Station, Sohag Governorate, Egypt during 2016 season to evaluate toxicity of Lambda-cyhalothrin 10%WP, Acetamiprid 25% SP, Diazinon 60% EC and Emamectin Benzoate 5% SG insecticides against the oriental hornet Vespa orientalis L.

(Hymenoptera: Vespidae).

Also to evaluate diluting these insecticides with sugar, flour and talc powder and its effect against the oriental hornet.

Also to study indirect effects of Acetamiprid 25% insecticide with different concentration on V.

orientalis adults.

The results showed that Acetamiprid 25% and Lambda- cyhalothrin 10% recorded the lowest time required for killing the wasps with 1.88 and 3.04 Minutes, respectively, by no significant difference between them.

However, the highest time was recorded for Emamectin Benzoate 5% with 122.40 minutes.

Diluted all insecticides with sugar recorded the shortest time needed to kill oriental hornet with mean number (3.67, 4.48,100.10 and 159.10 Minutes) for Lambda-cyhalothrin 10%, Acetamiprid 25%, Diazinon %60 and Emamectin Benzoate %5, respectively.

The indirect effects of Acetamiprid 25% recorded the shortest time needed to kill oriental hornet with 25% concentration (2.96 Minutes) for stage1.

For stage 2, the 2.5% concentration with sugar recorded the shortest time needed to kill hornet with average (7.14 Minutes).