In the spring larvae move upwards in the soil seeking plants. Because soybeans and lespedeza are rotated with rice in the midsouth, grape colaspis larvae often have only rice on which to feed. Some larvae complete development on rice. However, rice is not a host plant that adults use for oviposition. Damage and Symptoms Larvae feed on roots and the portion of the plant stem between the germinated seed and the soil surface.
Damaged plants become yellowed, stunted, and wilted.
Under water-stress many damaged plants will die. Plants with two or less above ground leaves are very susceptible to damage by colaspis larvae. None to moderate densities are often found in rice following soybeans. No formal sampling plan is available for scouting grape colaspis. Often the damage is completed before the above ground symptoms become obvious to growers or is altogether ignored or not seen.