2005 Weed Control Guide
April 14, 2005
E1. Navy bean generally is less tolerance to herbicides than other dry beans types or soybean. Rotary hoe before crook stage or after emergence up to 1 to 2 trifoliates.
E2. Basagran (bentazon) applied in sequential treatments provides improved broadleaf weed control compared to a single application. Basagran at 1 pt/A plus petroleum oil applied before weeds are 0.5 to 4 inches tall with repeat application 7 to 10 days later will control cocklebur, lambsquarters, annual smartweed, Venice mallow, and wild mustard. Common ragweed, kochia, pigweed, and sunflower may be partially controlled. Refer to label for information on weed sizes at application. NDSU research has shown greater control of lambsquarters, redroot pigweed and kochia by applying Basagran as split treatments either twice each at 1 pt/A, 3 times each at 0.67 pt/A, or 4 times each at 0.5 pt/A as compared to one application at 2 pt/A.
E3. Eptam (EPTC) at 2.3 to 3.5 pt/A or 11 to 15 lb 20G/A plus Prowl, Sonalan, or trifluralin controls many grass and broadleaf weeds including wild oat and common lambsquarters. Incorporate at a 4 to 6 inch depth immediately after application. Do not use Eptam on soybean.
E4. Intrro (alachlor) only PPI at 2 to 3 qt/A, metolachlor or S-metolachlor PPI or PRE at 1 to 2 pt/A, or Outlook (dimethenamid) PPI, PRE or EPOST up to the third trifoliate at 1 to 2 pt/A controls annual grasses and some broadleaf weeds. PPI may provide more consistent weed control since rainfall is essential for activation. Outlook can be applied in sequential treatments for improved nightshade control in dry bean. Outlook PPI or PRE provides greater nightshade control than Dual or Lasso but may degrade in the soil before nightshade emergence ceases. Apply Outlook EPOST alone or with Basagran up to third trifoliate dry beans to reduce late nightshade emergence.
E5. Prowl/Prowl H20 (pendimethalin), Sonalan (ethalfluralin), and trifluralin are discussed under the soybean section.
Trifluralin, Prowl and Sonalan applied PPI controls annual grasses, redroot pigweed, and common lambsquarters. Adjust rate for soil type and incorporate in the top 2 to 3 inches of soil within 2 days of application.
Sonalan 10G at 7.5 to 12.5 lb/A 10G applied in the fall or spring suppresses foxtail in dry edible bean and sunflower grown in reduced tillage systems. Apply in the fall between October 10 and December 31, or spring PPI before planting. Apply to tilled land or standing or chopped stubble. Incorporate twice 2 to 3 inches deep using a V-blade undercutter or other implements such as a rotary hoe that leave a maximum amount of crop residue on the soil surface. The first incorporation should be performed within 48 hours after application. The second incorporation should be performed at an angle to the first incorporation and must be delayed at least 14 days after the first incorporation. Sonalan 10G applied in the fall should be incorporated once in the fall and the second time in the spring before planting. Refer to label for application rate according to soil type. The higher rate should be used in high crop residues and heavy weed populations.
E6. Pursuit (imazethapyr) at 2 fl oz/A or Pursuit DG at 0.72 oz/A or 10 acres per water soluble packet applied PPI, PRE or POST controls many broadleaf weeds including wild mustard and nightshade in most dry bean types, field pea. Pursuit can be applied ONLY PPI within 1 week of planting or PRE up to 3 three days following planting to chickpea/garbanzo bean and lentil at rates listed above. DO NOT apply POST to chickpea/ garbanzo bean or lentil. Do not apply after crop has begun flowering. Reduced crop growth, yield, and/or delayed maturity may result from application. Do not apply if planting is delayed, or cold and/or wet weather are present or predicted to occur within one week of application. Do not apply to Domino variety black turtle bean. Pinto varieties UI-111 and Olathe are more sensitive to injury than other Pinto varieties. Apply with NIS at 0.25% v/v to dry beans with at least one trifoliate leaf. DO NOT use oil additives or liquid fertilizer. Refer to the Raptor paragraph in the soybean section for additional information on application use and restrictions. See Pursuit under the herbicide residue section for information on crop rotation restrictions. User assumes all risk of liability for injury.
E7. Raptor (imazamox) at 4 fl oz applied POST controls or when preceded by a soil applied grass herbicide registered in dry bean controls many annual grass and broadleaf weeds with limited crop rotation restrictions. Raptor control nightshades and may control or suppress wild buckwheat applied PPI. Refer to the Raptor paragraph in the soybean section for information on application, adjuvant use, and restrictions.
E8. Reflex (fomesafen) may be labeled through ND Section 18 emergency labeling for control of several broadleaf weeds including nightshade and common ragweed. Apply Reflex POST at 0.75 pt/A with NIS at 0.25 to 0.5% v/v or oil adjuvant at 0.5 to 1% v/v. Oil adjuvant may increase weed control but also increases risk of dry bean injury. Refer to the Flexstar paragraph in the soybean section for information on application and adjuvant use and restrictions.