Hannah C. Lindell, Misha R. Manuchehri, Emi Kimura, Todd A. Baughman, Nicholas T. Basinger
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引用次数: 0
Abstract
In Oklahoma, downy brome and cheat are difficult-to-control winter annual grasses. In the past, cheat infested most of the winter wheat hectares harvested in Oklahoma. Biotypes cross-resistant to acetolactate-synthase-inhibiting herbicides have left growers with minimal management options in conventional and herbicide-tolerant systems. Field trials at Lahoma, Oklahoma in 2019-20 and 2020-21 evaluated integrated management of cheat and downy brome using three strategies: planting date (optimal, mid-, and late), cultivar selection (high- and low-competitiveness), and herbicide choice (no herbicide, sulfosulfuron at 35.2 g ai ha-1 and pyroxsulam at 18.4 g ai ha-1). Visual control, weed species (spp.) present, wheat biomass at heading, and grain yield data were collected. In 2019-20, eight to nine weeks after treatment, visual control increased 15% with mid-planting compared to optimal planting date and 14% with late planting compared to mid-planting. In 2020-21, similar control (∼99%) was recorded for mid- and late plantings with 23% greater control than the optimal timing. Due to a lack of weed coverage, weed biomass in 2019-20 had no response to planting date, cultivar, or herbicide treatment. Downy brome biomass during 2020-21 was ∼90% lower with mid to late planting than optimal. In the same year, downy brome and cheat biomass were low (≤ 0.4 and 0.2 g m-2) and 98% less after an herbicide application than nontreated. Wheat grain yield at the optimal planting date was greatest compared to mid- and late planting date for 2019-20. A delay in planting from the optimal date to mid- or late timings decreased wheat yield 14 and 21%, respectively. In 2020-21, late planting reduced wheat yield 57% compared to optimal planting. Delaying planting date and the use of a common herbicide can suppress cheat and downy brome., but a decline in wheat yield may occur.
期刊介绍:
Weed Technology publishes original research and scholarship in the form of peer-reviewed articles focused on understanding how weeds are managed.
The journal focuses on:
- Applied aspects concerning the management of weeds in agricultural systems
- Herbicides used to manage undesired vegetation, weed biology and control
- Weed/crop management systems
- Reports of new weed problems
-New technologies for weed management and special articles emphasizing technology transfer to improve weed control
-Articles dealing with plant growth regulators and management of undesired plant growth may also be accepted, provided there is clear relevance to weed science technology, e.g., turfgrass or woody plant management along rights-of-way, vegetation management in forest, aquatic, or other non-crop situations.
-Surveys, education, and extension topics related to weeds will also be considered