No-till crop production in South Dakota is on the rise. Marestail is a native plant to the United States and is considered either a winter annual or biennial species that is often difficult to identify at the rosette stage. In the Dakota’s, the Marestail population will germinate in the fall and bolt in the spring.
Kochia is a problem in row crops in North Central South Dakota. New Post-emergent options in corn and soybean have helped alleviate Kochia competition from many fields, but these herbicide options shouldn’t be completely relied upon for a long-term plan for control.
September 30, 2019
Fall is the time to control tough perennial broadleaf lawn weeds. Good moisture in most places in August will have set up good fall growth of perennial weeds.
This week we received a report of insects infesting a soybean field. However, they weren’t insects that we generally think of when the term "soybean insect pests" comes up.
Southern rust was found in a few corn fields scouted last week. This rust is developing very late in the season and therefore its impact on corn yield will be minimal.
Fall weed control can give the best weed control, but it also can be a poor time. If the noxious weeds were sprayed or clipped earlier this summer and there is good weed growth now, this would be a excellent time to spray these weeds and get a good kill.
Some portions of soybean fields may show clusters of plants yellowing while the rest of the field is still green. One of the factors that could lead to soybean plants showing early yellowing in clusters is soybean cyst nematode (SCN).
During 2019 we have received varying reports regarding grasshopper populations. Many reports have indicated that grasshopper numbers are down. However, we have also received reports of very large grasshopper populations in some areas of South Dakota. So why such a difference?
Winter wheat planting will soon be starting and a number of decisions will have to be made for a successful winter wheat crop, including: the time of planting, the choice of variety to be planted, disease and pest management decisions and crop insurance.
Although many soybean fields are behind schedule, so are the soybean aphid populations. In many reported areas, there are hotspots within a field where a few soybean plants may be heavily infested.