Document Type : Pest Management
Authors
Abstract
A set of field and greenhouse experiments were conducted in 2004-2005 to study antagonistic effects of 2,4-D plus MCPA with clodinafop propargyl in wheat. The field experiments were conducted in Maybod and Oroumieh, where tank mixture of 2,4-D plus MCPA at 0, 975 and 1300 g ai ha-1, with clodinafop propargyl at 0, 64, 80, 96 and 112 g ai ha-1 in factorial arrangement and four replications per treatment. Hoary cress (Cardaria draba (L.) Desv.), littleseed canarygrass (Phalaris minor Retz.), haresear mustard (Conringia orientalis (L.) Dumort.) and downy brome (Bromus tectorum L.) were the dominant weed species in the field experiments. Greenhouse experiments further evaluated the efficacy of these tank mixtures on prostrate knotweed (Polygonum aviculare L.), littleseed canarygrass and poison ryegrass (Lolium temulentum L.). In the field, herbicides were applied at wheat tillering while in the greenhouse the herbicides were applied at the beginning of tillering stage and at four-leaf stage of grass and broadleaf weeds, respectively. The most satisfactory tank mixture was 2,4-D plus MCPA at 975 and 1300 g ai ha-1 with clodinafop propargyl at 96 g ai ha-1. Yield increased when tank mix of clodinafop propargyl with 2,4-D plus MCPA was applied on wheat. To prevent clodinafop propargyl efficacy reduction due to tank mixing with 2,4-D plus MCPA, the application dose (64 g ai ha-1) should be increased to 96 g ai ha-1
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