The side-effects of pesticides on Trichogramma cacoeciae Marchal (Hymenoptera: Trichogrammatidae), an egg parasite
2000
Kakakhel, S.A. (National Agricultural Research Centre, Islamabad (Pakistan). PODB Research Unit) | Hassan, S.A.
The standard methods of IOBC/WPRS were followed to test Vertimic @ 1.47 micro L, 0.735 micro L, Dimethoate @ 25.00 micro L, 12.50 micro L, 6.25 micro L, Kumulus @ 0.675 micro L, 0.336 micro L and Touchdown @ 156.00 micro L, 78.00 micro L, 39.00 micro L for their side-effects on Trichogramma cacoeciae Marshal. The adult parasites were exposed to fresh pesticide residues. The control was sprayed with tap water. The results showed that these chemicals differed markedly in their toxicity. Among the tested pesticides, Dimethoate @ 25.00 micro L, 12.50 micro L and 6.25 micro L gave total mortality of the parasite compared to water treated control. It reduced the parasitism by 100 percent. Hence, categorized as harmful. Vertimic @ 1.47 micro L was slightly harmful with 57.37% reduction in parasitism. The remaining pesticides, Vertimic @ 0.735 micro L, Kumulus @ 0.675 micro L, 0.336 micro L, Touchdown @ 156.00 micro L, 78.00 micro L, 39.00 micro L were harmless and did not differ with water treated control. These are more suitable for the use in Integrated Pest Management (IPM).
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