Posted 31 October 2016. PMN Crop News.
Fall Weed Control in Wheat and Barley
Consider a fall herbicide application on your small grains if winter annual weeds are a problem
Source: Penn State University Press Release. agsci.psu.edu
University Park, Pennsylvania (October 12, 2016)--Dense populations of winter annual weeds can compete with wheat and barley in late fall and early spring and slow the rate of crop development potentially reducing yield. If winter annual weeds like common chickweed, henbit, winter annual grasses, and others emerge with the small grain and are left unchecked, the potential impact on yield could be great. In these situations, it may make sense to kill these weeds in the fall rather than early spring.
Harmony Extra is the most broad spectrum herbicide for broadleaf control, but resistant populations of common chickweed are becoming evident in parts of the state. In addition, there are several herbicides labeled for grass control in wheat and fall is typically the best time to make an application. Make sure to include the necessary spray adjuvants. Remember that cool (less than 50 degrees F) cloudy days can reduce herbicide activity. Also, if you plan to frost-seed or drill a companion crop such as red clover in early spring it may be best to make a fall herbicide application to avoid certain issues with herbicide residuals affecting their establishment. However, even if products such as PowerFlex HL, Osprey, Glory and others are applied in the fall, their recrop restrictions still prevent seeding next spring. This table summarizes some fall herbicide options for small grains. Check a current herbicide label for the latest use information.