Toxicological and biological studies of some compounds against the two spotted spider mite, tetranychus urticae and its predatory mite, Amblyseius gossipi on different host plants

Document Type : Original Article

Authors

1 Pesticides Department, Fac. Of Agric. Kafr El-Sheikh, Tanta Univ., Egypt

2 Plant protection institute Giza Dokki, Egypt.

3 Pesticides Department, Fac. of Agric. Kafr El-Sheikh, Tanta Univ., Egypt

4 Pesticides Department, Fac. of Agric. Tanta Univ., Egypt

10.21608/jpces.2006.460749

Abstract

The present study was carried out to evaluate the toxic effect of five compounds; three specific acaricides; (Abamectin, Fenpyroximate and Etoxazole); one pyrethroid insecticide (Cypermethrin) and one mineral oil (Supermasrona), against the eggs and adult females of the two spotted spider mite, Tetranychus urticae (Koch) and adult females of predatory mite, Amblyseius gossipi (El-Badry) on three different host plants (castor bean, green beans and tomato) using leaf-disc dip technique. The effect of sublethal doses of these compounds on some biological and behavioral characteristics of this mite and its predator was also examined. The results indicated that, Abamectin has a special position in mite chemical control or in integrated mite management because of its high toxic effect and its high toxicity index between different tested mite control agents. Etoxazole is the safest compound to adult females of predator mite A. gossipi on the three hosts. Cypermethrin is the most effective compound tested on egg deposition of T. urticae on castor bean leaf discs but fenpyroximate is the most effective compound tested on egg deposition on green beans and tomato leaf discs. In addition, Cypermethrin was the most effective compound decreasing egg hatchability especially on castor bean and green beans leaf discs. The pyrethroid compound (Cypermethrin) and the acaricide compound (Abamectin) are the most effective that decreased prey egg consumption, decreased predator egg production and caused high decrease in egg hatchability of the predator A. gossipi on the three host plants.

Keywords

Journal of Pest Control and Environmental Sciences
Volume 14, Issue 2
December 2006
Pages 227-256

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