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The aim of this study was to determine the economic damage threshold of Pigweed redroot for corn regarding its density. An experiment was conducted at the Agriculture Research station of Islamic Azad University branch of Gonabad during 2006. The experiment was carried out as a factorial in a randomized complete block design with three replications. In the experiments, the factors included corn (var. 704) densities of 7.5, 8.5 and 9.5 plants m-2 and pigweed redroot densities of 0, 2, 4, 6 and 8 plants m-2. The increase in Pigweed redroot density, decrease in crop grain and biomass yield components such as ear length, ear diameter, number of grains per row, row number, grain number in ear, grain yield and biological yield of corn, decreased. Also, with an increase in corn density, the number of grain per rows, row number, grain yield and biological yield of corn increased. The economic thresholds density of Pigweed redroot was 0.09 to 0.13 plants m-2 in corn different densities, and increased with corn density increases. O objetivo deste estudo foi determinar o nível de dano econômico do caruru na cultura do milho em função das densidades do milho e do caruru. O experimento foi conduzido na Agriculture Research Station of Islamic Azad University, em Gonabad. O delineamento experimental foi de blocos casualizados em esquema fatorial com três repetições. Os fatores incluíram densidades do milho (var. 704) de 7,5, 8,5 e 9,5 plantas m-2 e densidades do caruru de 0, 2, 4, 6 e 8 plantas m-2. O aumento na densidade de caruru diminui o número de grãos da cultura e os componentes de produção de biomassa, tais como comprimento e diâmetro da espiga, número de grãos por linha, número de grãos na espiga, o rendimento de grãos e o rendimento biológico do milho. Além disso, com o aumento na densidade de milho, o número de grãos por linha, o rendimento de grãos e o rendimento biológico de milho aumentaram. O nível de dano econômico do caruru foi alcançado com 0,09-0,13 plantas m-2 em diferentes densidades de milho

The effects of pigweed redroot (Amaranthus retoflexus) weed competition and its economic thresholds in corn (Zea mays)