-The interference imposed the by weeds on corn decreases practically all vegetative characteristics. As consequence, the green ear and grain yield are also reduced. Losses due to the fall armyworm (Spodoptera frugiperda) attack can reduce corn grain yield up to 34%. In general, weed and insect control issues are addressed separately in research papers. Nevertheless, interaction between weeds and insects may exist. This study aimed to evaluate green ear and corn grain yield response to weed and fall armyworm control. A completely randomized block design with split-plots and five replicates was adopted. Corn cultivar AG 1051 was grown under weedy conditions or with control by hand hoeings performed at 20 and 40 days after planting. Fall armyworm control (applied to subplots) was performed with sprays of water (control), deltamethrin (5g active ingredient ha -1 ); neem oil, at 0.5% (diluted in water), and neem leaf extract at 5%. Each product was sprayed three times, at seven-day intervals, starting at the 7 th day after planting, using 150 L ha -1 of the tank solution. Dry mass of the above-ground part, internode diameter, leaf length, leaf width, leaf area, green ear yield and grain yield of corn were reduced due to the lack of weed control. Fall armyworm control in the weeded plots did not influence green ear yield and grain yield, except green mass of marketable, husked ears, which was reduced when the caterpillar was not controlled. Without weed control, neem extracts and deltamethrin sprays provided highest yields of number and total weight of green ears with husks, number and weight of marketable ears with husks and number of marketable ears without husks. The best results for husked ear mass and for grain yield were obtained with neem extract and deltamethrin, respectively.Keywords: Zea mays, Spodoptera frugiperda, Azadirachta indica, weed-pest interaction.RESUMO -A interferência imposta pelas plantas daninhas ao milho reduz praticamente todas as características vegetativas. Em conseqüência, os rendimentos de espigas verdes e degrãos são reduzidos. Perdas devidas ao ataque da lagarta-do-cartucho (Spodoptera frugiperda) podem reduzir o rendimento de grãos em até 34%. Em geral, os efeitos dos controles das plantas daninhas e das pragas são estudados separadamente. Apesar disso a interação entre interferência de plantas daninhas e ataque de pragas pode existir. O objetivo deste trabalho foi avaliar os rendimentos de espigas verdes e de grãos de milho em resposta ao controle das plantas daninhas e da lagarta-docartucho. Utilizou-se o delineamento de blocos completos casualizados com parcelas subdivididas e cinco repetições. O milho cultivar AG 1051 foi cultivado no mato ou com controle de plantas daninhas por capinas manuais aplicadas aos 20 e 40 dias após a semeadura. Para avaliar o controle do inseto (aplicado às subparcelas) foram feitas pulverizações com: água (testemunha); deltamethrin (5 g do ingrediente ativo ha -1 ); óleo de nim, obtido comercialmente, à base de 0,5% (com diluição em água); e e...