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O objetivo deste trabalho foi avaliar o efeito da mistura no tanque entre o herbicida nicosulfuron e o inseticida chlorpirifos sobre o milho híbrido P30F80, as plantas daninhas e a lagarta-do-cartucho. O delineamento experimental utilizado foi o de blocos ao acaso, em esquema fatorial 5x2+3, com quatro repetições. O primeiro fator foi constituído pelas doses de nicosulfuron (0, 10, 20, 30 e 40 g ha-1) + atrazine (1.200 g ha-1) + óleo (900 g ha¹) e o segundo pelas doses do inseticida chlorpirifos (0 e 240 g ha-1). Foram avaliados três tratamentos adicionais: duas testemunhas, com e sem capina, ambas sem inseticida, e uma testemunha com capina e com inseticida. Não ocorreu interação significativa entre doses de nicosulfuron e do chlorpirifos no controle da lagarta-do-cartucho. A mistura no tanque do chlorpirifos com nicosulfuron tornou-se não-seletiva ao milho híbrido P30F80, acarretando redução do número de espigas e do rendimento de grãos de milho. O chlorpirifos não interferiu diretamente na eficiência de controle das plantas daninhas pelos herbicidas, em avaliações realizadas aos 14 e 28 dias após aplicação desses produtos. Todavia, a toxidez causada às plantas de milho pela mistura do chlorpirifos ao nicosulfuron contribuiu para redução do controle cultural das espécies daninhas I. grandifolia e B. decumbens pelo milho. This study aimed to evaluate the effect of the tank mixture of the herbicide nicosulfuron with the insecticide chlorpirifos on the maize hybrid P30F80, weeds, and fall armyworm. The experiment was arranged in a randomized complete block design, in a 5x2+3 factorial scheme and four replications. The first factor consisted of nicosulfuron doses (0, 10, 20, 30, and 40 g ha-1) + atrazine (1.200 g ha-1) + oil (900 g ha-1) and the second of doses of the insecticide chlorpirifos (0 and 240 g ha-1). Three additional treatments were evaluated: two controls, with and without weeding, both without insecticide, and one control with weeding and insecticide. The interaction between the doses of nicosulfuron and chlorpirifos in the control of the fall armyworm was not significant. The chlorpirifos-nicosulfuron tank mixture was non-selective for the maize hybrid P30F80, reducing the number of ears and maize grain yield. Chlorpirifos did not interfere in the efficiency of weed control by the herbicides 14 and 28 days after application of these products. However, the toxicicity caused to the maize plant by the chlorpirifos-nicosulfuron tank mixture contributed to reducing the crop control of Ipomoea grandifolia and Brachiaria decumbens by maize

Efeitos de mistura de herbicida com inseticida sobre a cultura do milho, as plantas daninhas e a lagarta-do-cartucho