Imazapic

weed control and effects on the development of peanut cultivar IAC OL3

Abstract

Peanut is considered an oilseed crop of great economic importance mainly for the State of São Paulo, where it is cultivated in the reform of sugarcane fields, and the impacts of herbicides on the crop are little known. Within this context, the objective was to evaluate the effects of different doses of imazapic in the control of any weed infestation community as well as the injuries caused in the peanut cultivar IAC OL3. A randomized block design was used, with four treatments and five repetitions, totaling 20 experimental units. The treatments were the different doses of imazapic: control; dose of 65g a.i. ha^-1; 98g i.a. ha^-1 and 130g i.a. ha^-1. The application condition was plant-apply. At 15, 30 and 60 days after application (DAA) weed control scores and phytotoxicity scores for peanut culture were assigned. Satisfactory and decreasing weed control was found for all treatments, except for the control up to 60 DAA. The injuries verified disappeared completely in the peanut plants at 75 DAA. It was concluded that for an infesting community composed of Cyperus rotundus, Euphorbia heterophilla, Urochloa decumbens and Digitaria insularis, it was controlled with 98 and 130 g imazapic ha^-1 in pre-emergence, without causing damage to the peanut cultivar IAC OL3