File:Cooperative economic insect report (1963) (20073559214).jpg

Title: Cooperative economic insect report
Identifier: cooperativeecono139unit (find matches)
Year: 1963 (1960s)
Authors: United States. Bureau of Entomology and Plant Quarantine; United States. Plant Pest Control Branch; United States. Plant Pest Control Division; United States. Animal and Plant Health Inspection Service. Plant Protection and Quarantine Programs
Subjects: Insect pests Control United States Periodicals
Publisher: Washington, D. C. : U. S. Dept. of Agriculture, Agricultural Research Administration, Bureau of Entomology and Plant Quarantine
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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- 151 - Converse Counties. Platte County had the largest populations in Wyoming, 10 to 20 per corn plant, but little damage was found. After the first heavy frost, 700 to 800 beetles per 100 sweeps were found in alfalfa adjacent to corn fields. In MONTANA, western corn rootworm causes heavy damage where chemical control or rotation is not practiced. Infestations of economic importance are still confined to Yellowstone County. Populations of western corn rootworm were high in Montrose County, COLORADO, with 5 to 7 adults per 100 plants and controls used in some fields of corn. In northern and northeastern Colorado, the western corn root- worm has continued to be a problem requiring control at planting time in those fields where corn is planted year after year. Western corn rootworm was found again in Rock and Pipestone Counties, MINNESOTA. and in Nobles County for the first time. Populations were extremely low and accounted for only a small frac- tion of the rootworms present in the State. Western corn rootworm was recorded for first time in Cherokee, Pocahontas, O'Brien, Lyon and Plymouth Counties, IOWA, and in Atchison, Holt, Nodaway, Worth, Gentry, Andrew and De Kalb Counties, MISSOURI, during 1962. Typical northern corn rootworm damage was less apparent in MINNESOTA than in 1961. This may have been due to increased use of soil insecticides and/or extremely wet weather. Larvae of northern corn rootworm stunted 20 percent of the corn plants in one out of six fields in west-southwest ILLINOIS, June 10-15. Adults were common and larval damage evident in many corn fields in the northwest, west and west-southwest districts of Illinois July 22-27. During July 30-August 3, adults were observed in 55 percent of the corn fields in northeast and 33.3 percent in the east district. They were commonly observed feeding on silks and ear tips throughout the northern half of Illinois August 12-17. In late August, adults were abundant in clover and alfalfa throughout the northern half of the State.
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Distribution of Western Corn Rootworm

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