. Cooperative economic insect report. Insect pests Control United States Periodicals. - 162 - scattered and at times very localized. Soil insecticide treatments were applied to more than one million acres planted to corn in 1964. This was the first year organic phosphate insecticides were used to any extent for controlling soil insects in Minnesota and results were very erratic. DISTRIBUTION OF WESTERN CORN ROOTWORM. A survey for western corn rootworm was conducted during the 1964 season in Minnesota to determine spread in the State. This pest of corn was first found in the State in 1961 in Ro
. Cooperative economic insect report. Insect pests Control United States Periodicals. - 162 - scattered and at times very localized. Soil insecticide treatments were applied to more than one million acres planted to corn in 1964. This was the first year organic phosphate insecticides were used to any extent for controlling soil insects in Minnesota and results were very erratic. DISTRIBUTION OF WESTERN CORN ROOTWORM. A survey for western corn rootworm was conducted during the 1964 season in Minnesota to determine spread in the State. This pest of corn was first found in the State in 1961 in Rock and Pipestone Counties, and during 1962 and 1963 had spread eastward to the Minnesota-Wisconsin State line and northward in Minnesota to Pope County. Western corn rootworm increased in importance in the south- western area where it appears to have replaced northern corn rootworm in many fields. D. virgifera is of prime importance in the southwestern part of Minnesota, overshadowing D. longicornis in 5 or 6 counties and comprises a lower, but still important, percentage of total rootworm,populations in 8 or more counties. The survey revealed the rapid movement of western corn rootworm into other areas of Minnesota from 1961 to 1964. A potential for problems during the 1965 season exists in Rock, Nobles, Jackson, Pipestone, Murray and Cottonwood Counties. In the surrounding counties of Lincoln, Lyon, Redwood, Brown, Watonwan and Martin, scattered fields can be expected to have problems during the 1965 season, and there is the possibility that individual problems with western corn rootworm will develop in fields well outside of this area. To broaden the potential in Minnesota, any fields where 4 or 5 beetles were found per plant in 1964 problems may be expected in 1965. Western corn rootworm was found for the first time in WISCONSIN in the River Falls area of Pierce and St. Croix Counties during the 1964 season. In ILLINOIS, one adult of western corn rootworm was found in a fie
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