Japanese beetles appear to be coming out in full force again this year. From what I have observed thus far, they are staying mainly in the corn crop as opposed to soybean.
According to UK entomologists, the economic threshold for Japanese Beetle defoliation is 35% in the vegetative stages.
Click here to learn about Japanese Beetles in Kentucky soybean.
Much more information can be found about insect damage in the Kentucky Integrated Pest Management Manual for Soybean.