EFFICIENCY OF GLYPHOSATE IN ASSOCIATION WITH PROTOX-INHIBITING HERBICIDES IN THE CONTROL OF Paspalum maritimum Trind.

Abstract

In Northeastern Brazil, an important weed is ginger grass (Paspalum maritimum Trind.), mainly due to its aggressiveness. For the control of this species, the glyphosate herbicide is used in post-emergence, however, the association between glyphosate and herbicides that inhibit the enzyme protoporphyrinogen oxidase (Protox) can be a more efficient alternative and with less possibilities of inducing resistance provided by the control unsatisfactory due to rain or other edaphoclimatic factors that may occur at the time of application. In this sense, the present study aimed to evaluate the efficiency of the herbicide glyphosate (isopropylamine salt) alone and in association with Protox-inhibiting herbicides, namely flumioxazine), sulfentrazone and oxyfluorfen under simulation of 20 mm rain, with factorial intervals of 2 – 4 – 8 – 16 – 32 – 64 hours after application of the herbicides and a control without washing the leaves. The experiment was conducted in a greenhouse at the Center for Agricultural Sciences, Federal University of Alagoas, in the municipality of Rio Largo. A completely randomized experimental design (DIC) was used, with four replications in a factorial scheme (herbicides x washing time). The ginger grass was highly susceptible to the association between Glyphosate and Flumioxazine, a mixture that provided an increase in the control efficiency of this weed in post-emergence, in rainfall simulations of 2 – 4 – 8 – 16 – 32 hours after the application of the herbicides. In the evaluation of regrowth, the isolated use of isolated Glyphosate led to the death of the plant, thus preventing regrowth. The use of glyphosate associated with the herbicide Flumioxazine proved to be an alternative for the control of ginger grass quickly and efficiently.