What is in this article?:
- Itâ€™s time to scout soybeans for insect problems
- Problem near field edges
• Insects of particular note to watch for are three-cornered alfalfa hopper and kudzu bug.
It’s probably a good idea to scout full-season soybeans sometime this week.
Insects of particular note to watch for are three-cornered alfalfa hopper and kudzu bug.
Possible critters that are out in the system right now that can reduce stands or chew parts of plants in seedling soybeans, are slugs and grasshoppers. For pests that may reduce stand levels, try to ensure that the stand stays above Jim Dunphy’s recommended densities for a replanting decision.
These are 50,000 plants per acre or more of May-planted soybeans or 75,000 plants per acre of June-planted soybeans. He also recommends replanting stands of lower densities only if the grower can get seed of an equally acceptable variety.
Slugs like to harbor in fields with lots of residue. They feed at night or on cloudy days and are favored by lots of moisture.
During the day, their presence can be indirectly detected by shiny slime trails. These can be washed off by rain, so dig around in the residue to look for them.
Insecticides are ineffective against these pests, so our best recommendation is a product called Deadline M-P’s. A trial in Mississippi showed this product could provide excellent control.
Scott Stewart, University of Tennessee, recommends an evenly spread distribution at 10 lbs./A, as this product is relatively expensive. Also, he mentioned that it is not often in stock at the local dealer.
Slugs are generally an early season phenomenon, as warm and dry weather is not favorable for their development. Under good growing conditions the plants should be able to outgrow this injury.
Grasshoppers can reduce stands by clipping seedling plants, but can also eat a lot of foliage. These are more of a problem later in the year, but by this time, plants should be large enough to tolerate the feeding injury.