A recent windstorm has left several South Dakota producers wondering what to do next with their affected soybean fields. Extreme winds combined with dry conditions created a dust storm this past week.
With soybean starting to emerge throughout South Dakota, one of the early season pests to scout for is the overwintering population of bean leaf beetles. We have started getting reports of bean leaf beetles causing defoliation near Mitchell.
There have been reports in recent years that agronomists in states such as Iowa, Nebraska and Wisconsin have observed success when reducing soybean planting populations.
In South Dakota, there are several species of grasshoppers that can have a negative impact on rangeland health. The United States Department of Agriculture’s (USDA) Animal Plant Health Inspection Service (APHIS) conducts an annual survey to monitor grasshopper populations in Western South Dakota.
In 2017, researchers at South Dakota State University completed a grasshopper survey of Eastern South Dakota. The last grasshopper survey to be conducted in Eastern South Dakota was published in 1925.
For most plant diseases, in-season management choices are very limited. In fact, there are no in-season management options available for diseases caused by nematodes, viruses, and bacteria. Careful considerations are therefore needed before planting the crops.
The first pyrethroid resistant soybean aphids were reported in Minnesota in 2015. Since then, pyrethroid resistant soybean aphids have been reported in Iowa, North Dakota, and South Dakota. In an effort to address resistance, researchers from those states have put together a new extension publication.
Starting April 30, 2018 all dicamba products that are not a mixture but instead straight dicamba are restricted use in South Dakota. This will mean all applicators will need to keep spray records of use and place of application.
The prolonged winter conditions this spring have kept the soils too frozen/wet to sample for SCN. However, soil temperatures are now war and it is now a good time to sample fields for SCN, if weren’t sampled in the fall.
Overwintering bean leaf beetle adults will soon start emerging as they do each spring. This overwintering generation is capable of causing serious defoliation injury to seedling soybean plants.