Eficácia do Haloxyfop-p-methyl no controle de milho voluntário em dois estádios de desenvolvimento

Abstract

With the emergence of resistance to technology Roud up Ready® there was a wide spread of this new cultivar in most Brazilian crops. With this method is simplified weed control, but created a new paradigm: the control of volunteer corn RR® through the soybean crop. This study evaluated the effectiveness of haloxyfop-p-methyl herbicide in controlling RR® corn in V5 and V10 stages. The experiment was conducted at FAECA – Fazenda Experimental das Ciências Agrárias, Universidade Federal da Grande Dourados - UFGD in Dourados, with the planting of corn hybrids DKB 290 RR amid soy simulating volunteer plants. The hybrid corn was studied using a randomized block design in a factorial scheme 6x2 with four replications. The experimental units consisted of plots of 4.0 x 7.0 m. The first factor represented haloxyfop-p-methyl (40, 50 and 60g a.i. ha-1); Paraquat (Gramoxone®) (400g a.i. ha-1.); Glyphosate (780g a.i. ha.-1), and a control treatment without herbicide. The second factor the development stage of the corn hybrid, represented by V5 and V10. Doses of 40 and 50 g of haloxyfop-p-methyl demonstrated efficiency in the control of the hybrid maize plants, both in the V5 growth stage as V10, but the control was more effective at V5 stage.