. Cooperative economic insect report. Beneficial insects; Insect pests. 931 - NEW YORK - Found in silks and whorls in Hudson Valley, but not in alarming numbers. May have been responsible for destroying field corn in eastern Dutchess County, ( Wkly. Rpt., Aug. 3). VERMONT - Newly emerged third-generation larvae reported in Franklin County where first infestations detected July 9-10; no injury noted, however. Continuing problem dependent on weather conditions. Fields checked July 31 showed 10-40 percent pupation and 15-25 percent of larvae parasitized. (Aug. 3). Third-brood diminishing'rapi
. Cooperative economic insect report. Beneficial insects; Insect pests. 931 - NEW YORK - Found in silks and whorls in Hudson Valley, but not in alarming numbers. May have been responsible for destroying field corn in eastern Dutchess County, ( Wkly. Rpt., Aug. 3). VERMONT - Newly emerged third-generation larvae reported in Franklin County where first infestations detected July 9-10; no injury noted, however. Continuing problem dependent on weather conditions. Fields checked July 31 showed 10-40 percent pupation and 15-25 percent of larvae parasitized. (Aug. 3). Third-brood diminishing'rapidly August 10, (MacCollom). EUROPEAN CORN BORER (Ostrinia nubilalis) - ILLINOIS - Egg laying heavy on sweet corn in Peoria County, central district; egg masses on late field corn ranged 20-110 (average 58) per 100 plants. Few First-Generation European Corn Borer Populations in Illinois - 1964 Borers per 100 plants Iftiper fig. I96I+ Lower fig. 1963, 27 47 eggs noted on late field in northwest district; moths abundant in grass and weeds around edges of early corn fields and more numerous than usual in soybeans. (111. Ins. Rpt.). MICHIGAN - Early stage, second-brood larvae active in Shiawassee County; moderate adult numbers continue at blacklight traps in Lower Peninsula. (Newman, Snow). WISCONSIN - Pupation ranged 27-69 percent with 15-80 percent of pupal cases empty in Grant, Lafayette, Richland, Trempealeau, Rock, Dane, Vernon, La Crosse and Pepin Counties. Freshly laid egg masses common in some fields; 11 noted on 25 plants examined in one Spring Green; total of 4 egg masses noted on 25 plants of field corn examined near Janesville. Should high temperatures continue, emergence and egg laying will be completed in very short time. (Wis, Ins, Sur.), MINNESOTA - Percent development, by district, as follows: Southwest - 69 fifth instar, 11 pupae and 20 emerged; south central - 17 fifth instar, 50 pupae and 33 emerged; central - 25 fifth instar, 75 pupae and trace emerge
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