Commelina Species Control with Desiccants Alone and in Mixtures

Abstract

ABSTRACT: The objective of this study was to evaluate the chemical control of the species C. benghalensis and C. erecta with desiccants alone and mixtures, as well as the spreading of spray droplets on the leaf surfaces. The experimental design was completely randomized in a 2 x 16 factorial arrangement with four replications, totaling 32 treatments and 128 plots. The first factor is related to the species C. benghalensis and C. erecta and the second factor corresponds to the treatments carfentrazone-ethyl in doses of 15, 30, 60 g ha-1, which added 0.5% v v-1 adhesive spreader; glufosinate ammonium at doses of 100, 200, 400 g ha-1, added 0.5% v v-1 mineral oil; glyphosate at 240, 480, 960 g ha-1; carfentrazone-ethyl + glufosinate ammonium in doses of 100, 200, 400 g ha-1 being added 0.5% v v-1 of mineral oil; carfentrazone-ethyl + glufosinate ammonium in doses of 15+100, 30+200, 60+400 g ha-1 being added 0.5% v v-1 of mineral oil; and carfentrazone-ethyl + glyphosate at 15+240, 30+480, 60+960 g ha-1, which added 0.5% v v-1 of a spreader and sticker agent, besides the controls without applications. There was a difference in control between species for desiccants applied alone. For C. benghalensis there was an excellent control (> 85%) for all the treatments. However, for C. erecta the best controls involved glufosinate ammonium (200 and 400 g ha-1), carfentrazone-ethyl (30 and 60 g ha-1), glyphosate (960 g ha-1) and all mixtures with an average of 96.6% in the control.

Keywords

• weed
• droplets surface tension
• spreader and sticker agent
• chemical control
• synergism