Japanese beetle adults are beginning to emerge in eastern Nebraska and have been reported feeding in corn and soybean. Here's how to differentiate them from the look-alike sand chafers and treatment thresholds to determine when treatment is recommended.
Populations of immature grasshoppers are being reported in areas bordering crop fields in several parts of eastern Nebraska. If these grasshopper species are one of the four major species that are likely to infest cropland, control may be warranted. Check here are scouting guide and treatment thresholds and recommendations.
Accumulated degree-days offer a proven means for estimating when to scout for insects, including the western bean cutworm. Here's how to estimate insect growth and recommended dates to start scouting for WBC at 14 Nebraska sites.
Growers are noting shot-hole feeding from European corn borer in non-Bt corn. Nebraska Extension offers several resources to monitor moth activity and determine when treatment is necessary.
Common stalk borer eggs have hatched throughout Nebraska and scouting should begin when 1300-1400 degree days have accumulated (Figure 1). This is when larvae start moving into corn and other crops. Stalk borer growth is based on accumulated degree days since January 1, using a base of 41°F.
Potato leafhoppers have been reported in alfalfa in southeastern and northeastern Nebraska. This is somewhat earlier than usual and growers should be alert to potential damage and protecting their alfalfa where numbers indicate treatment thresholds would be met.
Guide to identifying and managing alfalfa and clover leaf weevils in alfalfa. While research in northeast Nebraska has shown that clover leaf weevil larva feeding does not cause yield reduction to first cutting alfalfa, alfalfa weevil feeding can cause severe losses to yield and quality of the first cutting. This is why it's important to correctly identify the type of weevil feeding causing damage.
