Date of this Version
Insect Science, Plant Disease, & Weed Science, University of Nebraska Cooperative Extension, Institute of Agriculture and Natural Resources 87(17) (July 17, 1987)
In This Issue:
- Wiper and Bean Bar Applications
- Summer Lawn Weed Control
- Stunted Soybeans
Wiper and Bean Bar Applications
Wiper applicators are popular for controlling tall growing weeds in shorter crops. The weeds should be at least 10” taller than the crop. Roundup is the herbicide of choice for wiper applications in sorghum and soybeans. A concentration of 25% Roundup in water is used for control of broadleaf and grass weeds. Shattercane and volunteer corn are very susceptible to Roundup. Roundup concentrations of 20% work well on these plants.
Summer Lawn Weed Control
Crabgrass, yellow nutsedge, spurge, and yellow woodsorrel are among the most troublesome lawn weeds in July and August. Effective control and safety to other plants is often difficult. In a previous newsletter we gave you information on yellow nutsedge and prostrate spurge control. Here's our suggestions on crabgrass and yellow woodsorrel(oxalis).
There have been more than the usual reports of stunted soybeans this year. The primary symptom is stunting of plants. Often, but not always, the herbicide in question has been Scepter. The symptoms aren't clear cut and often there has been some disease involvement. Additionally, problems seem to be more serious in eroded areas within a field. These eroded areas are normally less productive regardless of any other problems. High temperature stress in June caused problems on soybeans in general and may be a contributing factor.