Uso de safener associado a clomazone para manejo de plantas daninhas infestantes da cultura do trigo

Abstract

In the wheat crops in Southern Brazil are common infestation of the crop by weeds, turnip (Raphanus raphanistrum e R. sativus) and ryegrass (Lolium multiflorum). These weeds are managed in drying or post-emergence normally for herbicides inhibitors of acetolactate synthase (ALS), 5-enolpyruvylshikimate-3-phosphate (EPSPs), acetyl-coenzyme A carboxylase (ACCase) and the inhibitors of auxins. Intensive and repetitive use of these mechanisms of action in areas cultivated with wheat selected turnip population resistants of the ALS and the ryegrass for EPSPs, ALS and ACCase. However, the objective was to evaluate the work phytotoxicity and the effectiveness of the clomazone herbicide with or without the dietholate applied to wheat. The experiment was installed in a greenhouse, in a completely randomized design (CRD), arranged in a factorial design (5 x 4) + 3. The factor was allocated to dietholate doses (0, 120, 240, 360 and 480 g per 100 kg seed) and in B clomazone doses (0, 198, 396 and 594 g ha-1). Additional treatments were a control without weed and applying post-emergence of iodosulfuron-methyl (5 g ha-1) and pyroxsulam (18 g ha-1). The dietholate showed no ability to protect the whet from phytotoxic effects of the clomazone herbicide. The clomazone herbicide even at lower doses causes excellent control ryegrass. Among the herbicides tested the pyroxsulam was more selective culture, with excellent action on turnip and satisfactory control of ryegrass.