ESTIMATION OF GENERAL SELECTIVE TOXICITY RATIOS OF CERTAIN ACARICIDES TO STETHORUS GILVIFRONS (MULSANT) AND ITS PREY TETRANYCHUS URTICAE KOCH

Document Type : Original Article

Authors

1 Plant Protection Research Institute, Ismailia Agricultural Research Station, Egypt

2 Plant Protection Department, Faculty of Agriculture, Suez Canal University, Egypt

3 Agricultural Research Centre of Finland, 31600 Jokioinen, Finland

4 Plant Pathology Research Institute, Agricultural Research Centre, (Under Secretary of State for plant quarantine, Ministry of Agriculture, Dokki, Giza, Egypt

Abstract

The general selective toxicity ratio of twelve acaricides to avoid the confusion result from the use of two selective ratios, at LC50 and LC90 levels, was determined. The relative toxicity of the tested com­pounds against S.gilvifrons and its prey T.urticae, revealed that dicofol was the most effective compound. whereas fenpyroximate was the least effective against the mite at each of LC50 and LC90 !eels. Results also showed that fenpropathrin had the highest toxicity, at the same former levels, while propargite (Comite) had the lowest toxicity at LC50 level and propargite (Acargite) at LC90 level against S.gilvifrons. The value of the general selective toxicity ratio recommended fenazaquin, propargite (Acargite), azocyclotion, dicofol, ethion, propargite (Comite), bromo­propylate, hexythiazox, profenofos and fenpyroximate as the safest acaricides for S.gilvifrons as compared to its prey T.urticae.

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