CORRELATION BETWEEN SUCKING PESTS INFESTING COTTON PLANTS AND THEIR ASSOCIATED NATURAL ENEMIES

Document Type : Original Article

Authors

Plant Protection Research Institute, Agricultural Research Centre, Sakha Research Station, Egypt

Abstract

The present study was carried out at Sakha Agric. Res. Station during 1990 and 1991 cotton seasons to evaluate the interrelations be‌tween sucking pests infesting cotton plants and their associated natural enemies. Results obtained revealed that the population of the sucking pests (jassid, aphid, whitefly and spider mite) fluctuated recording two to four generations during a period extending from April to September in both seasons. Meanwhile, the associated natural enemies (C.undecimpunctata, Ch_carnea, P.aifierii, Scymnus app., Onus app. and true spiders) were respresented by two to three peaks during the same period of inspection. The statistical analysis of the data showed that insignificant sim‌ple correlation coefficient had been found between the population of certain sucking pests infesting cotton plants and the total population of their associated predators, except that for spider mites. Also, the corre‌lation was generally positive, while it was negative for aphids population.

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