SELECTIVITY OF HERBICIDES APPLIED IN POST-EMERGENCE ON MILLET (Pennisetum glaucum)

Abstract

Pearl millet is an important crop in succession cultivation in the Brazilian Cerrados (savanna), showing the importance of studies concerning the selectivity of herbicides for weed management in this culture. The present study objectified to evaluate the selectivity of the herbicides mesotrione, tembotrione, atrazine, nicosulfuron, imazethapyr, haloxyfop-methyl and clethodim, applied in post-emergence on millet culture. The millet cultivars ADR-300 and ADR-500 were cultivated in units of 10 dm-3 of soil, under greenhouse conditions. A completely randomized design was used, in a 8 x 2 factorial scheme with five replications. The cultivars were submitted to the application of herbicides at the stage of four expanded leaves. Herbicides nicosulfuron, imazethapyr, haloxyfop-methyl and clethodim caused phytotoxicity in both studied millet cultivars, unlike atrazine that presented great selectivity for application in post-emergence. Partial selectivity to pearl millet was observed for herbicides mesotrione and tembotrione, especially tembotrione, which indicates its potential use in this culture.

Keywords

• Poaceae
• tricetones
• ALS inhibitors
• ACCase inhibitors