|Pest: Bean Leaf Beetle|
Your Soybean Checkoff.
Scouting for the Bean Leaf Beetle
|Bean Leaf Beetle.
Note the prominent black triangle at the front of the wing covers. This is the most reliable diagnostic feature of the bean leaf beetle. The marking is always present and it distinguishes the bean leaf beetle from other beetles in soybean.
Photo credit ISU Entomology Image Gallery.
Also see: Bean leaf beetles and others: correctly identifying the pest,
Iowa State University:
Start scouting early in the season. Kevin Steffey, entomologist at the University of Illinois, recommends sharpening your scouting skills for bean leaf beetles in seedling soybeans. Experienced scouts have learned that bean leaf beetles tend to "play dead" and drop from seedling soybeans to the ground when they are disturbed. So approach your sampling area quietly.
Examining plants by hand is the easiest method for seedling soybeans. As the plants grow, use of a beat cloth may help you assess numbers of bean leaf beetles per foot of row. Remember to scout in several areas of a given field to obtain a reasonable assessment of bean leaf beetle density for the field.
A few high counts are offset when several areas of a field are not infested, lowering the average number of beetles per plant. There's no need to treat an entire field and spend more money than necessary if the field average of bean leaf beetles is lower than economic thresholds.
Drop cloth method
Sweep net method
New Concept for Bean Leaf Beetle Management
Wai-Ki F. Lam, Marlin Rice, Larry Pedigo, and Rich Pope
Integrated Crop Management Newsletter , Iowa State University