Submitted to: Washington State Weed Conference Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 9/1/2002
Publication Date: 11/1/2002
Citation: BOYDSTON, R.A., MILLER, T., YENNISH, J. PEA TOLERANCE AND NIGHTSHADE CONTROL WITH FLUMIOXAZIN AND SULFENTRAZONE. PROCEEDINGS OF THE 52ND ANNUAL WASHINGTON STATE WEED CONFERENCE, P. 32. 2002.
Technical Abstract: Nightshade berries can contaminate processing peas reducing quality and increasing processing costs. Nightshade control in peas is erratic with currently labeled herbicides. Flumioxazin and sulfentrazone were tested separately, each at five rates and in combination with pendimethalin or metolachlor for PRE nightshade control in two pea varieties, Snake and Genie. The trial was located on a Quincy sand soil containing 0.5% organic matter near Paterson, WA. Pea emergence was delayed with all herbicide treatments except the lowest rate of flumioxazin (0.03 lb ai/a) and sulfentrazone (0.094 lb ai/a). Both herbicides caused stunted growth and leaf necrosis at higher rates. Pea injury was greater when flumioxazin or sulfentrazone was tank mixed with metolachlor. No treatments containing flumioxazin reduced pea yield, but sulfentrazone above 0.125 lb ai/a reduced pea yield. Most herbicide treatments delayed pea maturity compared to untreated checks. Both herbicides controlled hairy and black nightshade, pigweed, and common lambsquarters well.