Response of winter wheat (Triticum aestivum L.) and weeds to tank mixtures of 2,4‐D plus MCPA with clodinafop propargyl

Abstract

Field and greenhouse experiments were conducted in 2004 and 2005 to study weed control and the response of winter wheat to tank mixtures of 2,4-D plus MCPA with clodinafop propargyl. The field experiments were conducted at Yazd and Oroumieh, Iran, with factorial combinations of 2,4-D plus MCPA at 0, 975, and 1300 g ai ha -1 and with clodinafop propargyl at 0, 64, 80, 96, and 112 g ai ha -1 in four replications. The greenhouse experiments further evaluated the effect of these tank mixtures on weed control, where each herbicide mixture was considered as one treatment and the experiment was established in a randomized complete block design with four replications. In the field experiments, the herbicides were applied at wheat tillering, while in the greenhouse experiments they were applied at the beginning of the tillering stage and at the four-leaf stage of the grass and broadleaf weeds, respectively.The results indicated antagonistic effects between 2,4-D plus MCPA and clodinafop propargyl. The best tank mixture with regard to weed control efficacy was 2,4-D plus MCPA at 975 g ai ha -1 with clodinafop propargyl at 96 g ai ha -1 . The wheat grain yield was also increased by the tank mixture of clodinafop propargyl with 2,4-D plus MCPA. Generally, to inhibit clodinafop propargyl efficacy reduction due to tank-mixing with 2,4-D plus MCPA, it is recommended that the application dose of 64 g ai ha -1 should be increased to 96 g ai ha -1 .

The effects of phenoxy herbicide MCPA on non-target vegetation in spring wheat (Triticum aestivum L.) culture

“…It indicates that due to reduced competition with the weeds the crops may produce more grains and this may result in higher yield. The increase in yield of wheat grown under field conditions and in greenhouse was recorded after the application of MCPA and in mixture with 2,4-D (Lisova, 2001;Baghestani et al, 2007). Though during the field studies in Canada, the reduction in wheat yield was observed after the treatment with phenoxy herbicides MCPA had a slight stimulatory effect on the content of photosynthetic pigments (Fig.…”

Risks of Tank Mixing Fungicides with Grass and Broadleaf Herbicides in Spring Wheat Management

“…Pesticides, when chemically compatible, are often tank mixed and applied together to protect crops from a wide range of diseases, weeds, and/or insects. While reducing the cost and time required for pesticide applications, tank mixing can alter the response of the pests and/or the crops to certain active ingredients and the effects can be additive, synergistic, or antagonistic (1,2,9). Over the years, substantial efforts have been made to understand the interactions among pesticides in order to optimize crop management programs, with the majority of the literature devoted to the topic of insecticide‐herbicide interactions (4,9).…”