Table 7. Herbicides for weed control in min-till small grain in crownvetch

Information About:

Mailing Address:

Dept. of Crop & Soil Sciences 116 ASI Building University Park, PA 16802-3504
Phone: +1-814-865-6541 Fax: +1-814-863-7043 David Sylvia, Department Head

Cover Crops and Conservation Tillage for Soil Erosion Control on Cropland

Table of Contents

See specific product label to determine correct rate for the soil type and weed species found in individual fields.
Don’;t plant a small grain into crownvetch until it is well established (3–4 yrs. old) and can tolerate Roundup or Touchdown or some form of minimum tillage.
Min-tillage will suppress the crownvetch sufficiently to get the small grain established, but herbicide treatments will usually be necessary to suppress the crownvetch regrowth.

23242526

Table 7. Herbicides for weed control in min-till small grain in crownvetch.
Herbicide	No.	Product/A	lb ai/A	Remarks	Weeds Controlled
Harmony Extra plus nonionic surfactant	0.33 to 0.66 oz. plus 1 qt/100 gal.	0.014 to 0.028 lb label rate	Read the label. For use on fall-seeded wheat and barley (growth stage 1 to 7) or oats (growth stage 2 to 5). If applying in liquid fertilizer, reduce surfactant to 0.25 – 0.5 qt/100 gal liquid fertilizer to reduce injury potential to small grain.	Excellent wild garlic and broadleaved weed control with some crownvetch suppression.
MCPA amine — Use only on crownvetch that is more than 2 to 3 years old.	0.5 to 1 pt	0.25 to 0.5	Read the label. Apply in the spring after small grains are well-tillered (growth stage 3 to 6), in 5 to 10 gal water. Use low-pressure (10 to 20 psi) or flood-jet nozzles. May be used at temperatures between 60° and 80°F.	Annual and winter annual broadleaved weeds in all small grains in established crownvetch.
MCPA - amine or ester — Use only on crownvetch that is more than 2 to 3 years old.	0.25 to 0.5 pt	0.12 to 0.25	Read the abel. Apply in spring; (growth stage 3 to 6), in at least 10 gal water when weeds are small. Use MCPA amine when temperatures are between 60 and 85°F. Use ester formulation between 50 and 70°F. Add dicamba at 0.12 pt/A for hard-to-kill weeds and greater crownvetch suppression.	Canada thistle, mayweed, corn chamomile, pigweed, corn cockle, wild buckwheat, smartweed, knawel, and crownvetch suppression.
Buctril (bromoxynil) May be applied with liquid fertilizers. Use only on crownvetch that is 2 to 3 years old.	1 pt	0.25 Apply when air temp. is above 60°F.	Read the label. Apply fall or spring; when weeds are in 2- to 4-leaf stage, in 10 to 20 gal carrier. Kills species resistant to 2,4-D and MCPA.	Winter annuals such as corn chamomile, mayweed, groundsel, henbit, and knawel.