The aim of this work was to evaluate the effects of drift simulation of commercial formulations of glyphosate on the growth of young plants of yellow passion fruit. The work was carried out at the Plant Science Department of the Universidade Federal de Viçosa (MG), Brazil, from March to April 2007. The experiment was arranged in a completely randomized block design, with five replications, in a factorial 3 x 4 + 1, consisting of three glyphosate formulations and five doses, (one being the control without herbicide). Each plot was constituted by one plant. The applied doses of glyphosate were 43.2; 86.4; 172.8 and 345.6 g ha-1, using the commercial formulations: Roundup Transorb®, Roundup Original® and Zapp QI®. After 28 days of application, aerial part, root and total length (cm), stem diameter (mm), number of leaves and primary ramifications, aerial part and root dry mass,(g) and the foliar area per plant (cm²) were evaluated. After 7, 14 and 28 application days, intoxication percentage of the plants was also evaluated. Regardless of the formulations used, glyphosate drift simulation caused injury to the yellow passion fruit, reducing plant growth. The herbicides Roundup Transorb® and Roundup Original® were more harmful than Zapp Qi®. The yellow passion fruit was susceptible to drift simulation; thus, glyphosate must be used carefully, so as to reach only the weeds to be controlled.
plant intoxication; herbicide; yellow passion fruit; weeds; Passiflora spp
