We are starting to get more reports of spider mites damaging corn and soybeans in Nebraska. Because many other things can cause similar discoloration, it is important to check leaves closely to make sure mites are actually causing the damage.
Recommendations for managing spider mites in corn and soybean, including treatment thresholds, insecticides as well as discussions on the potential impact of beneficial insects, diseases, and insecticide applications.
Corn is progressing near the five-year average with 61% silking, while soybean is progressing ahead of average with 75% blooming and 31% setting pods. Both crops declined slightly in condition since last week according to the USDA’s National Agricultural Statistics Service. The winter wheat harvest is progressing ahead of average at 79% complete.
Fungicide use in corn has become increasingly popular for many farmers for a number of reasons. But, it becomes a more difficult decision when corn prices are low and some producers are looking for ways to reduce input costs when profit margins are narrow.
Southern corn rust was confirmed on corn leaf samples from Fillmore, Nuckolls and Johnson counties in southern Nebraska this week. Warm, humid conditions may favor disease development, so fields in this area should be monitored frequently in the coming weeks.
Prior to storms July 8-9, plants were nearing tassel, a critical time for photosynthesis and pollination. These storms resulted in “flattened” corn from lodging/leaning in addition to bent and snapped plants. "Recovery" depends on a variety of factors.