Eficiência do óleo de citronela (Cymbopogon winterianus) em mistura com Glyphosate no controle de plantas daninhas

Abstract

The present study aimed to evaluate the efficiency of essential oil of citronella as a potentiator of the herbicide glyphosate, control of invasive plants. The experiment was on Hope Farmhouse, in the municipality of Jandaia do Sul-PR, qualifying, in percentage, the dead plants and those that suffered symptoms by the action of the treatments. The experiment was DIC, with four treatments and four replications, where: T1-2, 8 l Glyphosate. ha-1 + 0, 75 Mineral oil. ha-1; T2-Glyphosate 2, 8 l. -1 + Citronella Oil 0.5 ha l. ha-1; T3-Glyphosate 2.8 l. ha-1 + Mineral oil 0.38 l. ha -1 + Citronella oil 0.38 Lha-1; T4-2.8 L for -1 Glyphosate. The application was performed with the aid of costal spray, with CO2 cylinder accumulating pressure 40 PSI and nozzle type range. Were conducted five evaluations submitted to three, six, ten, fourteen and twenty days after application of the treatments. According to the results obtained, there were no statistical differences among treatments. The weeds in the area identified in the experimental area suffered as herbicide action, yellowing and necrotic tissue, however, the acerbic (Digitariainsularis) and Horseweed (Conysabonariensis), have been shown to be tolerant to glyphosate.