. Cooperative economic insect report. Beneficial insects; Insect pests. - 1323 - CEREAL AM) FORAGE INSECTS CORN ROOTWORMS (Diabrotica spp.) - MINNESOTA - Larvae collected in 14 southwestern counties during past summer. Larvae kept separate by county; 298 larvae collected and recently determined as to either D. virgiiera (western corn rootworm) or D. longicornis (northern corn rootworm). This done as additional check on adult~ survey conducted during August. (See CEIR 15(36):1030 and 15(35):993-994). Larval collections and adult survey percentages, although not exactly same, compare very favora
. Cooperative economic insect report. Beneficial insects; Insect pests. - 1323 - CEREAL AM) FORAGE INSECTS CORN ROOTWORMS (Diabrotica spp.) - MINNESOTA - Larvae collected in 14 southwestern counties during past summer. Larvae kept separate by county; 298 larvae collected and recently determined as to either D. virgiiera (western corn rootworm) or D. longicornis (northern corn rootworm). This done as additional check on adult~ survey conducted during August. (See CEIR 15(36):1030 and 15(35):993-994). Larval collections and adult survey percentages, although not exactly same, compare very favorably. Differences in few county percentages probably due to smaller sample size of larval collections. The following table shows results of larval determinations by county: County Rock Nobles Jackson Martin Pipestone Murray Cottonwood Watonwan Lincoln Lyon Redwood Brown Yellow Medicine Lac qui Parle Percent D. longicornis 41 92 75 40 80 98 50 83 100 71 83 75 100 100 Percent D. virgifera 59 8 25 60 20 2 50 17 0 29 17 25 0 0 (Minn. Ins. Rpt.) SOUTHWESTERN CORN BORER (Zeadiatraea grandiosella) - MISSOURI - Fall survey for 1965 completed; 29 counties surveyed. Girdled stalks averaged percent in Southwestern Corn Borer Survey in Missouri - 1965. southwest and percent in southeast districts, compared with 10 percent in southwest and percent in southeast in 1964. No new counties were found infested in 1965. Accompanying map shows percent girdled stalks in counties surveyed. (Houser, Thomas). OKLAHOMA - Averaged 1 live larva per 100 stalks in corn checked in Bryan County. (Okla. Coop. Sur.). ALABAMA - In southern Tuscaloosa County and northern edge of Bibb County, 20 girdled cornstalks con- tained 20 overwintering larvae; survival 100 percent (McQueen). GREENBUG (Schizaphis graminum) - KANSAS - Remains low in most areas. No damage reported. (Simpson). OKLAHOMA - Counts increased to 120 per linear foot in wheat in Perkins area, Payne County. Ranged 3-25 per linear foot in Ma
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