Tifton 85 Tolerance to Glyphosate at Different Application Times

作者：Santos M V^*; Freitas F C L; Ferreira F A; Carvalho A J; Braz T G S; Cavali J; Rodrigues O L

来源：Planta Daninha, 2010, 28(1): 131-137.

DOI：10.1590/S0100-83582010000100016

• Cynodon spp.
• pasture
• weed
• forage

Tifton 85 is a type of forage of high nutritive value, recommended for grazing or hay and silage production. It can be considered a weed, mainly in agricultural and forage seed production areas, probably due to its easy propagation and fast development. Thus, this experiment aimed to evaluate Tifton 85 tolerance to increasing levels of glyphosate during two different seasons. The experiment was arranged in a completely randomized block design with four replications in a 2 x 8 factorial arrangement, and pulverization in two seasons (winter and summer) and eight glyphosate levels (0; 270; 540; 1,080; 2,160; 3,240; 4,320; and 5,400 g ha(-1)). The experiment was carried out in polyethylene pots with 10L capacity. For each season, control of the Tifton 85 plants was performed at 15, 30 and 60 DAA (days after application). Around 90% of Tifton 85 plant control was observed with 2,636.72 g ha(-1) of glyphosate in the winter and 3,607.03 g ha(-1) of glyphosate in the summer. The results obtained showed that Tifton 85 is highly tolerant to glyphosate and control is more efficient in the winter than in the summer.

• 出版日期2010