The 2018 Eastern South Dakota grasshopper survey has indicated that there a few counties that are at an increased risk for grasshopper populations that could cause severe defoliation to current crops as well as fall emerging winter wheat. Although many areas of the eastern side of the state actually have lower grasshopper abundance than 2017, there are still hotspots.
The SDSU Extension WEED Project will be at the fair to answer your questions again. This year the feature is Wormwood sage or Absinth wormwood. There is a lot of concern on control of this weed in pasture range and no-till fields.
Bacterial leaf streak disease (BLS) of corn has been found again this year in the south east part of the state. In one field, BLS was wide spread but the severity was low. BLS symptoms may be confused with gray leaf spot, a fungal disease, as the symptoms look very similar.
We have received a few reports of conventional corn fields being affected by first-generation European corn borer feeding. How do we know that European corn borer was causing the issues?
Crop Producers, agronomists, gardeners, homeowners and anyone else who is thinking about taking soil samples this fall or next spring need to be aware that South Dakota State University no longer offers commercial testing. (Effective Oct, 2011). Below is a list of nearby state or private laboratories that can be used for crop production fields, gardens and lawns. The private laboratories are not necessarily recommended or endorsed, however many will give university recommendations when asked. Crop producers, agronomists, gardeners, and home owners with questions on sample submissions, analysis charges and recommendations should contact the laboratory of interest.
Dakotafest 2018 is less than a month away (August 21 – 23), and SDSU Extension entomologists will be there again to answer any and all insect related questions. We will be located in the SDSU Extension tent on the Northwest side of the grounds with insect displays and a lot of helpful handouts regarding major insect pests.
SDSU Extension has received calls from producers and agronomists observing possible crop damage from herbicide off-target movement. Some of these cases have been confirmed through tissue sampling.
Tissue sampling is a good tool for monitoring plant health during the growing season. However, it is important to note that tissue sampling is typically not a good indicator of potential response to in-season rescue applications.
While scouting corn fields last week we came across a few plants that had a unique pattern of holes on the leaves. The holes were all uniform in size and were in a perfectly straight horizontal line on the leaf. So what insect is capable of feeding so precisely?
Last week we noticed emergence of northern corn rootworm adults in South Dakota. Typically, the emergence of these primarily underground corn pests is simply an indicator of what population levels are and what the potential for future root injury might be.