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A seletividade de 24 herbicidas registrados para a cultura do milho foi avaliada a Trichogramma pretiosum em condições de laboratório (temperatura de 25±1 ºC, umidade relativa de 70±10%, fotofase de 14 horas e luminosidade de 500 lux). Adultos de T. pretiosum foram colocados em contato com uma película seca dos herbicidas pulverizados sobre placas de vidro e avaliou-se a capacidade de parasitismo das fêmeas. A redução na capacidade de parasitismo dos tratamentos foi comparada com a da testemunha (água destilada) e utilizada para classificar os herbicidas em 1, inócuo (<30%); 2, levemente nocivo (30-79%); 3, moderadamente nocivo (80-99%); e 4, nocivo (>99%). Os herbicidas Callisto, Equip Plus, Extrazin SC, Primóleo, Provence 750 WG e Siptran 500 SC são inócuos (classe 1); Agrisato 480 SL, Gesaprim GrDA, Glifos, Glyphosate Nortox, Gliz 480 SL, Polaris, Primatop SC, Sanson 40 SC, Trop e Zapp Qi, levemente nocivos (classe 2); Finale, Herbadox, Poast, Roundup Original, Roundup Transorb e Roundup WG, moderadamente nocivos (classe 3); e Gramoxone 200 e Primestra Gold, nocivos (classe 4) aos adultos de T. pretiosum, nas dosagens utilizadas. Os herbicidas nocivos (classes 2, 3 e 4) deverão passar para as etapas seguintes, que envolverão testes sobre as fases imaturas do parasitóide em condições de laboratório e adultos a campo. The selectivity of 24 herbicides registered on corn to Trichogramma pretiosum (Hymenoptera: Trichogrammatidae) was assessed under laboratory conditions (25 ± 1 ºC temperature, 70 ± 10% relative humidity, 14 4 photophase and brightness 500 lux). The adult parasitoids were submitted to a dry film of the herbicides applied on glass plates and the parasitism capacity of the females was evaluated. Reduced parasitism capacity in the treatments was compared with the negative control (distilled water) and used to classify the herbicides into four categories: 1, harmless (< 30%); 2, slightly harmful (30-79%); 3, moderately harmful (80-99%) and 4, harmful (> 99%). The herbicides Callisto, Equip Plus, Extrazin SC, Primóleo, Provence 750 WG and Siptran 500 SC were found to be harmless (class 1); Agrisato 480 SL, Gesaprim GrDA, Glifos, Glyphosate Nortox, Gliz 480 SL, Polaris, Primatop SC, Sanson 40 SC, Trop and Zapp Qi , slightly harmful (class 2); Finale, Herbadox, Poast, Roundup Original, Roundup Transorb and Roundup WG, moderately harmful (class 3); Gramoxone 200 and Primestra Gold were found to be harmful (class 4) to the adults of T. pretiosum at the dosages used. The harmful herbicides (class 2, 3 and 4) must undergo the next test stages, involving tests at the immature phases of the parasitoid under laboratory conditions and adult parasitoids under field conditions

Seletividade de herbicidas registrados para a cultura do milho a adultos de Trichogramma pretiosum (Hymenoptera: Trichogrammatidae)