. Cooperative economic insect report. Beneficial insects; Insect pests. - 195 - Corn and Sorghum Insects: The spread of EUROPEAN CORN BORER (Pyrausta nubilalis) was much more limited during 1959 than during 1958. During 1959 only 13 counties in 7 states reported its presence for the first time, compared with 58 counties and parishes in as many states during 1958. The report from Bowie County, Texas, during 1959, was the first record for that State. A distribution map of the species is included Distribution of Eiiropean Corn Borer European corn borer damage in North Dtikota was generall
. Cooperative economic insect report. Beneficial insects; Insect pests. - 195 - Corn and Sorghum Insects: The spread of EUROPEAN CORN BORER (Pyrausta nubilalis) was much more limited during 1959 than during 1958. During 1959 only 13 counties in 7 states reported its presence for the first time, compared with 58 counties and parishes in as many states during 1958. The report from Bowie County, Texas, during 1959, was the first record for that State. A distribution map of the species is included Distribution of Eiiropean Corn Borer European corn borer damage in North Dtikota was generally light except for a few scattered pockets in southeastern counties. The overwintering population, the highest ever recorded in the State, produced a slow-developing first brood. Weather conditions and slow plant development during June hampered egg laying and borer survival. Infestations ranged 0-60 percent by August 7, with an average of 11 percent of plants infested. First-generation pupation in North Dakota ranged 0-40 percent August 19. Weather conditions again interferred with moth flight and egg laying and no economic second generation was produced. Spring surveys in South Dakota indicated winter survival percentages of approx- imately 82 in northeast, 76 in east central and 70 in southeast areas, for European corn borer. Pupation began the first week of June in the southeast, with a very small amount of emergence by June 19. The first-brood population was light. Second-brood moth emergence occurred in mid-August, with the second-brood population being higher than the first. Overwintering European corn borer numbers in Minnesota were the lowest in many years, overwintering mortality averaging 27 percent. The first generation in 1959 was low, as expected, except in the southwest district. Only small niimbers of second-generation eggs were foxind; however, the fall abundance survey showed s larger population than expected. In Wisconsin, winter survival ranged from 91 perce
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