Sap beetle traps are sometimes used, but there is no convincing evidence of their effectiveness and they are not a replacement for proper sanitation. Sap beetle traps are placed outside the field, between field margins and wooded areas. This is to intercept beetles on their way to the crop. Any container of fermenting plant juices will attract sap beetles. Common baits include stale beer, molasses and water with yeast, vinegar, and overripe fruit from the field.
Beetles fall into the container and drown.
Sprays for sap beetles are available but difficult to use because they are applied to a crop that is ready for harvest. Therefore, selecting an insecticide with a short harvest interval is essential. Sprays should be applied only if absolutely necessary. Label directions should be read and followed carefully. Slugs Slugs range from yellow to black and may be several inches long.