Herbicides efficacy applied in Crotalaria spectabilis and Crotalaria ochroleuca adult plants

Abstract

The objective of this study was to evaluate the efficacy in herbicides control applied in Crotalaria spectabilis and Crotalaria ochroleuca adult plants. Three experiments were installed with seven herbicides arranged in a randomized block design with four repetitions. It was realized visual evaluations of control at 3, 7, 14, 21, 35 and 42 after applications (DAA), and regrowth at 21, 28, 35 and 42 (DAA). It was concluded that treatment with sequential application of glyphosate(1,550 + 1,860 g ha^-1) provided satisfactory control for both Crotalaria species. The treatments glyphosate + 2,4-D (1,240 + 806 g ha^-1), glyphosate + flumioxazina (1,240 + 50 g ha^-1) and glyphosate + metsulfuron-methyl (1,240 + 1.8 g ha^-1), were efficient only for controlling C. spectabilis, while glyphosate + carfentrazone-ethyl (1,240 + 32 g ha^-1) and glyphosate + saflufenacil (1,240 + 52.5 g ha^-1) were efficient for controlling C. ochroleuca. Glyphosate + chlorimuron-methyl (1,240 + 10 g ha^-1) treatmentwas not efficient for any species of sun hemp. Independent of flumioxazina doses (20; 30; 40; 50; and 60 g ha^-1) it was not verified the effectiveness of control for C. spectabilis.