Cover Crop And Herbicide Combinations For Session Long Weed Control In Dry Beans

Download or read book Cover Crop and Herbicide Combinations for Session-long Weed Control in Dry Beans written by Ryan T. Johnson and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Herbicides remain an important weed management tool in dry edible beans but reducing reliance on herbicides through integrated weed management practices is important. The objective of this study was to evaluate the effect of cover crops in combination with herbicides for weed suppression in dry bean (Phaseolus vulgaris). Field studies were conducted in 2021 and 2022 near Lingle and Powell, WY. Three small grain cover crop (winter wheat) treatments were planted in March (early), or in April (late), with a control treatment of no cover crop. Pinto beans were planted in early June and the cover crop was terminated with glyphosate on the day of bean planting. Each cover crop whole-plot was divided into four split-plots consisting of the following herbicide treatments: no herbicide, preemergence (PRE) herbicide application only (pendimethalin + dimethenamid-P), postemergence (POST) herbicide application only (bentazon + imazamox), and sequential PRE and POST herbicide application. Spring-planted winter wheat cover crop combined with herbicides had a beneficial effect on dry bean yield in 3 out of the 4 studies. Weed control failure in all treatments occurred at Lingle, 2022 due to presence of herbicide-resistant kochia. For the other three sites, POST herbicide had a greater impact on protecting dry bean yield than PRE herbicides or cover crops. Cover crop helped to reduce kochia and lambsquarters density but was even more consistent at reducing the aboveground biomass of these two weed species. The wheat cover crop failed to reduce hairy nightshade density, but this weed species was controlled by either PRE or POST herbicide application. POST herbicide application contributed the most to protecting dry bean grain yield, followed closely by PRE herbicide, and lastly by the cover crop.