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Overstreet: I have been seeing more rootworm damage the past few years in northwest Indiana, but still not like it was in the past. Nature of Rootworm Damage. “Particularly in corn-on-corn acres, we saw some of these populations just explode. For a second year in a row, corn rootworm abundance is lower than expected in Iowa. However, scouts and farmers have noticed rebounding populations of adult corn rootworm in the landscape now, especially noting root injury to first-year corn by northern corn rootworm. The root injury illustrated demonstrates how the Node-Injury Scale quantifies progressive feeding by corn rootworm larvae. The corn exhibited goosenecked and lodged stalks, the telltale signs of corn rootworm damage. Corn pollen is an important food source for newly emerged beetles. The potential for economic damage by corn rootworm larvae for the following year can be estimated by counting the number of adults on corn plants. Node-injury scale to evaluate root injury by corn rootworms (Coleoptera: Chrysomelidae). Identifying Corn Rootworm’s Damage Plants Affected. Western corn rootworm adult. It is not too early to … Root damage by corn rootworm (CRW) larvae weakens plants and may cause lodging or “goose-necking.” Severe lodging greatly complicates harvest and reduces yields by stunting the plant and reducing the ear size. Join the club for free to read now. Western Corn Rootworms, Diabrotica virgifera, and Northern Corn Rootworm, Diabrotica barberi. “Western corn rootworm numbers were higher in 2020 compared with recent years,” says Ron Beyer, a Golden Harvest agronomist who works with farmers in northwest Iowa. Short field video about digging for corn rootworm CRW damage: Dig a 6-7 inch ball of roots and pressure wash all the soil off to expose damage. To quantify root damage use the Nodal Injury Scale developed by J. Oleson, Y. For reference, a rating of 0.5 (one half of one node pruned) is considered unexpected damage to a pyramided Bt corn plant , and could be evidence of resistance. “Particularly in corn-on-corn acres, we saw some of these populations just explode. However, it will also damage other root crops, which include squash, clover, alfalfa, and cucumber. Journal of Economic Entomology 98: 1-8. I would definitely use the hybrids with resistance in corn after corn and corn after wheat. It also affects flowers, grass, and weeds. The main host plant of this pest is corn. Northern corn rootworm adult. Table 1. The corn exhibited goosenecked and lodged stalks, the telltale signs of corn rootworm damage. This is an excellent rating system. This is a wyffels insider article. Park, T. Nowatzki and J. Tollefson at Iowa State University. Northern corn rootworm adults are about ¼-inch long with pale green to yellow coloration. Symptoms. Understanding the risk of corn rootworm damage in your specific fields will help you make the best management decisions to manage risk and maximize profit in 2021. Start scouting three weeks after pollination and continue once per week until silks are dry and brown. Pay attention to the following signs, which will give you a warning that corn rootworms are present: It’s enough that we still need to consider it a major pest to think about. This is due, in part, to exceptionally wet spring conditions in 2014. “Western corn rootworm numbers were higher in 2020 compared with recent years,” says Ron Beyer, a Golden Harvest agronomist who works with farmers in northwest Iowa. Measuring rootworm damage in a field is critical to assess whether or not a resident rootworm population might be resistant to a particular Bt trait package. 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