Effects of insecticide residues on Trichogramma pretiosum (Hymenoptera: Trichogrammatidae)

Abstract

The research was carried out in order to examine the effects of insecticide residues: 1) Abamectin (MK-936 1.8 CE), 10 g a.i/ha; 2) Abamectin (MlC-936 1.8 CE), 159 a.i/ha; 3) Abamectin (MK-936 1.8 EC), 209 a.i/ha; 4) Parathion-methyl (Folidol 60 CE), 600 g a.i/ha; 5) Endosulfan (Thiodan 35 CE), 1,200 g a.i/ha; 6) Carbaryl (Carvin 85 WP), 2,0409 a.i/ha; 7)Phosmet (Imidan 50 WP), 7509 a.i/ha, and 8) Control (nothing was applied), applied to cotton (Gossypium hirsutum L CNPA-2H cultivar) plant surfaces on the emergente and parasitism ability of Trichogramma pretiosum. Tests were conducted on one, seven and fourteen days field-weathered sprays residues from cotton plants at dosage rases of eight insecticides. The results indicated that: 1) Parathion- -methyl (Folidol 60 CE), 600 g a.i/ha was extremely toxic to the egg parasitoid, T. pretiosum; 2) Abamectin (MK-936 1.8 CE), ten, fifteen and 209 a.i/ha, Endosulfan (Thiodan 35 CE). 1,2009 a.i/ha, and Phosmet (Imidan 50 WP). 750 g a.i/ha did not show significant impacts on parasitoid emergente and egg parasitism, and 3) All the insecticide tested did not show significative effects on T. pretiosum emergence and egg parasitism in the seven and fourteen days post spray tests.