. Cooperative economic insect report. Beneficial insects; Insect pests. 155 - FOREST TENT CATERPILLAR (Malacosoma disstria) - MINNESOTA - This pest has caused heavy defoliation on broadleaf trees Forest tent Caterpillar Defoliation Prediction in Minnesota - 1967 since 1964 in the north-central area. Since that date, infestation has spread very slowly. The 1967 defoliation pre- diction is illustrated on accompanying map. This predication is based on 3 surveys: An aerial defoliation survey in early July 1966, a light trap survey for moth distribution during entire month of July and an egg mass s
. Cooperative economic insect report. Beneficial insects; Insect pests. 155 - FOREST TENT CATERPILLAR (Malacosoma disstria) - MINNESOTA - This pest has caused heavy defoliation on broadleaf trees Forest tent Caterpillar Defoliation Prediction in Minnesota - 1967 since 1964 in the north-central area. Since that date, infestation has spread very slowly. The 1967 defoliation pre- diction is illustrated on accompanying map. This predication is based on 3 surveys: An aerial defoliation survey in early July 1966, a light trap survey for moth distribution during entire month of July and an egg mass survey conducted from October 15 to January 1. (Minn. Ins. Rpt.). EASTERN TENT CAPERPILLAR (Malacosoma americanum) - KENTUCKY - A statewide egg-mass survey was conducted in portions of Letcher, Morgan, Menifee, Powell, Bath, Montgomery, Marion, Taylor, Casey, Green and Adair Counties. Intensity of damage may increase compared with 1966. (South. For. Pest Rptr., Feb. Sum). CALIFORNIA OAKWORM (Phryganidia cali- fornica) - CALIFORNIA - Larvae heavy on oak trees at St. Helena and Yount- ville, Napa County. Larvae about one- third grown. Early occurrence of larvae indicates another year of severe defoliation unless virus diease cur- rently present in some specimens becomes effective. (Cal. Coop. Rpt.). AN OAK LEAF ROLLER (Croesia semipurpurana) - VIRGINIA - Some 5,000 acres of scarlet oak trees on the James River District of the George Washington National Forest were infested during 1966. Recently completed egg surveys indicate that extensive damage may occur in 1967. (South. For. Pest Rptr., Feb. Sum.).. A WHITEFLY (Aleuroplatus gelatinosus) - CALIFORNIA at Fresno, Fresno County. (Cal. Coop. Rpt.). Nymphs heavy on oak trees MAN AND ANIMALS COMMON CATTLE GRUB (Hypoderma lineatum) - OKLAHOMA - Counts per head averaged 5-8 on yearlings and cows in Payne and Noble Counties, 2-8 on cows in Dewey County, 1-12 on 30 percent of cows in Marshall County. Light to moderate in Mayes and Clevela
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