This research aimed to evaluate imazapic selectivity for two peanut cultivars (Tatu Vermelho and IAC) with and without sugarcane straw. The experimental design was completely randomized arranged in a3x2 factorial scheme with four replicates. The experiment was set in plastic pots and the treatments consisted of a combination of three rates of imazapic applied in pre-emergence (0, 98, and 140 g ha-1), and two levels of sugarcane straw (0 and 15 ton ha-1). The straw layer retained the herbicide, mainly under little precipitation or irrigation periods; under these conditions, peanut plants showed fewer intoxication symptoms. However, without the straw,the plants showed larger visual injuries and reduction in height, aerial parts and root dry mass for both peanut cultivars and herbicide rates.
injury; straw density; physical barrier
