107 research outputs found

    Efeitos residuais de inseticidas sobre Trichogramma pretiosum (Hymenoptera: Trichogrammatidae)

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    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.A presente pesquisa foi conduzida a fim de verificar os efeitos residuais dos inseticidas: 1) Abamectin (MK-936 1,8 CE), a 10 g do i.a/ha; 2) Abamectin (MK-936 1,8 CE), 15 g do i.a/ha; 3) Abamectin (MK-936 1,8 CE), a 20 g do i.a/ha; 4) Parathion-metil (Folidol 60 CE), a 600 g do i.a/ha; 5) Endosulfan (Thiodan 35 CE), a 1.200 g do i.a/ha; 6) Carbaril (Carvin 85 PM), a 2.040 g do i.a/ha; 7) Phosmet (Imidan 50 PM), 750 g do i.a/ha, e 8) Testemunha (sem inseticida) sobre a emergĂȘcia e capacidade do parasitismo de Trichogramma pretiosum. Testes foram conduzidos a um, sete e quatorze dias apĂłs a aplicação dos inseticidas em plantas de algodĂŁo (Gossypium hirsutum L.), 'CNPA-2H'. Os resultados obtidos mostraram que: 1) ResĂ­duos de Parathion-metil (Folidol 60 CE), a 600 g do i.a/ha foram altamente tĂłxicos a T. pretiosum; 2) ResĂ­duos de Abamectin (MK-936 1,8 CE), a dez, quinze e 20 g do i.a/ha, Endosulfan (thiodan 35 CE), a 1.200 g do i.a/ha e Phosmet (Imidan 50 PM), a 750 g do i.a/ha nĂŁo apresentaram efeitos signifitativos na emergĂȘncia dos adultos de T. pretiosum e seu parasitismo, e 3) ResĂ­duos dos inseticidas nas dosagens testadas, nĂŁo apresentaram efeitos significativos na emergĂȘncia de adultos de T. pretiosum, e seu parasitismo, a sete e quatorze dias apĂłs sua aplicação
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