paraquat (Gramoxone)
Rate 0.3 to 0.5 lb ai/A (1.2 to 2 pints/A Gramoxone 2 SL)
Time Apply when crop is mature: at least 80% of pods yellowing and mostly ripe, and no more than 40% (bush-type) or 30% (vine-type) of leaves still green.
Remarks Apply in 20 gal/A of water by ground or in at least 5 gal/A of water by air. Add a nonionic surfactant at 0.25% v/v (1 quart/100 gal spray solution). For vining or bush beans with lush and vigorous growth, use a single application at the higher rate. May also be applied as a split application. May be used on adzuki, black, broad, field, garbanzo, kidney, lima, mung, navy, pinto, rice, snap, and wax beans. Rainfast 15 to 30 minutes after application. REI 24 hr.
Caution A restricted-use herbicide. Applicators, mixers and loaders must wear long-sleeve shirt and long pants, shoes plus socks, protective eyewear (applicator), face shield (mixers and loaders), Category A chemical resistant gloves, chemical resistant apron (mixers and loaders), and a dust mist NIOSH-approved respirator with an N, R, P, or HE filter. Do not use on fava beans or faba beans. Do not make more than two applications or exceed 2 pints/A. Follow all safety precautions on label. Do not harvest within seven days.
Site of action Group 22: photosystem I electron diversion
Chemical family Bipyridilium
glyphosate (several trade names)
Rate 0.77 lb ae/A (22 fl oz/A Roundup PowerMax 4.5SL)
Time Apply at the hard dough stage of the legume seed (30% grain moisture or less)
Remarks Be aware that glyphosate is formulated as 3 lb, 4 lb, 4.5 lb, and 5 lb ae/gal. Take care to ensure using the correct amount of herbicide. Apply in 3 to 20 gal water/A. Apply at least seven days before harvest. Only one preharvest application may be made per year. Observe at least a 30-day plant-back interval between treatment and replanting of any crop not listed on product's label. REI 4 or 12 hr depending on the glyphosate product used.
Caution Do not feed treated vines and hay to livestock. Preharvest application is not recommended for legumes grown for seed, as a reduction in germination or vigor may occur.
Site of action Group 9: EPSP synthase inhibitor
Chemical family Glycine
saflufenacil (Sharpen 2.85SC)
Rate 0.022 to 0.045 lb ai/A (1 to 2 fl oz/A Sharpen 2.85SC)
Time Spray over the top of dry edible beans that have reached physiological maturity (beans have at least 80% yellow/brown pods and not more than 30% of leaves still green for vine-type beans, and no more than 40% of leaves still green for bush-type beans.
Remarks Allow up to 7 days for optimum desiccation effect depending on environmental conditions. REI 4 or 12 hr depending on the glyphosate product used.
Caution Do not apply on dry edible beans grown for seed production. Do not graze or feed desiccation-treated hay or straw to livestock. Do not exceed cumulative amount of 2.0 fl oz/A per season for desiccation.
Site of action Group 14 Protoporphyrinogen oxidase (PPO) inhibitor
Chemical family Pyrimidinedione
flumioxazin (Valor)
Rate 0.096 lb ai/A (3 oz/A Valor 51WDG)
Time When 80% of the pods are yellowing or mostly ripe with no more than 40% (bush-type) or 30% (vine-type) of the leaves still green in color.
Remarks Include a methylated seed oil (MSO) with a minimum of 15% emulsifiers and 80% oil. Use 2% v/v (2 gal/100 gal spray). A spray-grade nitrogen source, such as ammonium sulfate (AMS) at 2 to 2.5 lb ai/A or 28% or 32% urea ammonium nitrate (UAN) at 1 to 2 quarts/A may be added to improve performance. To ensure thorough coverage, apply with 15 to 30 gal/A spray solution. REI 12 hr.
Caution Do not harvest within 5 days after application. Do not use more than 3 oz/A in a season.
Site of action Group 14: protoporphyrinogen oxidase (PPO) inhibitor
Chemical family N-phenylphthalimide