Table 1. Preliminary root-rating results for corn rootworm trial, July 13, 2000, Urbana, Illinois.1
1Plots were planted on April 28, 2000, in a field that had been planted to a trap crop of corn in 1999.
2Iowa State University 1-to-6 root-rating scale used: 1 = no visible damage or only a few minor feeding scars, 2 = some roots wit feeding scars but none eaten off to within 1.5 inches of the plant, 3 = several roots eaten off to within 1.5 inches of the plant but never the equivalent of an entire node of roots destroyed, 4= one node of roots destroyed or the equivalent, 5 = two nodes of roots destroyed or the equivalent, and 6 = three or more nodes of roots destroyed. See issue no. 15 (July 7, 2000) of the Bulletin.
3Furadan 4F was applied on May 26, 2000, to coincide with corn rootworm larval hatch.