. Cooperative economic insect report. Beneficial insects; Insect pests. - 849 - CORN RCXDTWORMS (Diabrotica spp.) - COLORADO - Few D. virgifera adults on corn in Logan, Weld and Larimer Counties. Adult feeding on silks reduced pollination approximately 15-20 percent in some Logan County areas. (Colo. Ins. Sur.). NEBRASKA - D. virgifera adults dominant in corn in southeast; migrating to milo in central and southern areas, with estimated 20-30 per plant in some fields. Adults of D. longicornls dominate in Nehama County corn; as high as 20-30 adults per 10 sweeps in southeast district alfalfa. Sm
. Cooperative economic insect report. Beneficial insects; Insect pests. - 849 - CORN RCXDTWORMS (Diabrotica spp.) - COLORADO - Few D. virgifera adults on corn in Logan, Weld and Larimer Counties. Adult feeding on silks reduced pollination approximately 15-20 percent in some Logan County areas. (Colo. Ins. Sur.). NEBRASKA - D. virgifera adults dominant in corn in southeast; migrating to milo in central and southern areas, with estimated 20-30 per plant in some fields. Adults of D. longicornls dominate in Nehama County corn; as high as 20-30 adults per 10 sweeps in southeast district alfalfa. Small numbers of D. undecimpunctata howardi adults present in corn, milo and alfalfa in all areas checked. (Bergman). CORN FLEA BEETLES (Chaetocnema spp.) - NEVADA - C. ectypa adults ranged 10-40 per corn plant in Moapa and Virgin Valleys, Clark County. (Bechtel, Parker). OKLAHOMA- Populations of C. pulicaria decreasing on late-planted grain sorghum in Payne County, now in whorl and early boot stages. (Okla. Coop. Sur.). DELAWARE - C. pulicaria present in corn throughout State, but below economic numbers. XBiirbutis, Mason) . SPIDER MITES - NEVADA - Oligonychus sp. heavy on field corn in Panaca, Lincoln County. (Bechtel, Parker, Zoller). UTAH - Tetranychus telarlus severe on corn in many Utah County and some Weber and Davis County fields. (Dorst, Knowlton). COLORADO - Populations of T. telarius on upper leaves of corn in Prowers, Bent, Crowley, Otero, Pueblo, Logan, Weld and Larimer Counties. (Colo. Ins. Sur.). HESSIAN FLY (Phytophaga destructor) - KANSAS - The 1960 summer survey in 45 counties showed a lower average percent infestation than for 1959, except in south central area. The average percent of stems infested, by areas, for 1960 compared with that of 1959, is shown on the map below. (Jones).. Upper figure - 1959 Lower figure - 1960 WHEAT JOINTWORM (Harmolita tritici) - KANSAS - Infestations of 2 percent found in single fields in Doniphan, Brown, Bourbon and Crawford Coun
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