Safflower (Carthamus Tinctorius L.) Response to Drift Rates of Glyphosate

Abstract

The paper presented the field studies carried out in Ankara during 2017- 2019 to established the safflower responses (Carthamus tinctorius L. var. Remzibey-05) to drift rates of glyphosate. The herbicide at the rate of 18, 9, 4.5 and 1.44 g active ingredient (a.i.) ha-1 was applied at a spray volume of 19.2 L ha-1 to safflower seedlings at 2-4 true leaf stage using a CO2 pressurized knapsack sprayer. Crop injury and yield reduction caused by the herbicide was determined at 28 days after treatment (DAT) and at harvest. As the drift dose of glyphosate increases, the phytotoxicity occurring in the safflower plant also increases and reached to 68.75-73.75% 28 DAT. Yield reduction caused by the lowest drift rate of glyphosate was limited, 13-25%, compared to the nontreated control. At the highest drift dose, the plants could not produce spike and seeds.