Colaspis beetles: Injury and damage

Iowa colaspis beetle injury to soybean: Iowa colaspis beetle, Colaspis crinnicornis, injury to soybean. Leaflet injury of 10.8 [left], 13.5 [center], and 14.1% [right]. (Photos Marlin E. Rice)Iowa colaspis beetle injury to soybean: Iowa colaspis beetle, Colaspis crinnicornis, injury to soybean. Leaflet injury of 10.8 [left], 13.5 [center], and 14.1% [right]. (Photos Marlin E. Rice)

Adult colaspis beetles leave irregular and sometimes elongate holes on soybean leaflets.

Economic damage to soybean from adult colaspis beetle feeding has not been documented. However, substantial injury to soybean leaflets is evident when beetle populations are large. They may also transmit Bean pod mottle virus (Giesler et al. 2002). Currently, the effect of this feeding activity on soybean yield has not been determined. Larvae can also feed on soybean root hairs, but this is not known to impact soybean. However, soybean apparently can support economically important populations to corn when rotated from soybean. That is root-feeding of larvae on soybean is not important; however, this same activity can have a negative impact on seedling corn.