. Cooperative economic insect report. Beneficial insects; Insect pests. - 160 - percent opposed to percent in the southwest district, but represented a decrease of percent from the 1963 average. Cape Girardeau County, in the southeastern area, was the only newly infested county recorded in Missouri during 1964. Southwestern corn borer was present in OKLAHOMA this season but caused little damage. DISTRIBUTION OF SOUTHWESTERN CORN BORER. Southwestern corn borer infestations were heavier in ARKANSAS during the 1964 season than they were in 1963. Fall survey showed percent stalk lodgi
. Cooperative economic insect report. Beneficial insects; Insect pests. - 160 - percent opposed to percent in the southwest district, but represented a decrease of percent from the 1963 average. Cape Girardeau County, in the southeastern area, was the only newly infested county recorded in Missouri during 1964. Southwestern corn borer was present in OKLAHOMA this season but caused little damage. DISTRIBUTION OF SOUTHWESTERN CORN BORER. Southwestern corn borer infestations were heavier in ARKANSAS during the 1964 season than they were in 1963. Fall survey showed percent stalk lodging compared with percent in 1963, and lodged stalks per acre were 528 in 1964 compared with 180 in 1963. Moths from overwintering larvae became active in mid-May in the southern part of the State, and pupae of first-generation larvae appeared about June 20 in this area. Moths, which gave rise to third-generation southwestern corn borer larvae, appeared about August 15, and some second- generation larvae were still girdling stalks and going below ground level as early as August 22 in southern Arkansas. In LOUISIANA, infestations by first- generation southwestern corn borer larvae ranged 4-17 percent on corn in the Shreveport area of Caddo Parish during May. Second-generation populations were much lighter than expected, apparently as a result of drought, and infested less than 10 percent of plants. Southwestern corn borer was reported from 11 new counties in ALABAMA during 1964, extending the range of this pest in the State eastward from the 15 counties known to be infested in 1963, In combination with SOUTHERN CORNSTALK BORER (Diatraea crambidoides), southwestern corn borer caused considerable damage to corn in northern and northwestern sections of Alabama, especially to mid and late-season corn and sweet corn in home gardens. South- western corn borer, European corn borer and southern cornstalk borer were the most serious pest combination on sweet corn in the northwestern c
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