. Forest insect and disease conditions in the United States 1979. Insect pests United States. Table 16. —Northeastern Area gypsy moth defoliation — 7979 state 0-30° c 31-60°c 61-100°c Total 1978 Total Connecticut 234 468 3 835 Delaware 10 10 Maine 4,290 16,760 2,130 4 1 ?n Massachusetts 125 805 226 260 63 04? Michigan 100 100 New Hampshire 1,120 725 New Jersey 56 035 74,910 62,755 193 700 204 330 New York 76,450 162,275 Pennsylvania 8,552 Rhode Island 105 550 655 Vermont 10,925
. Forest insect and disease conditions in the United States 1979. Insect pests United States. Table 16. —Northeastern Area gypsy moth defoliation — 7979 state 0-30° c 31-60°c 61-100°c Total 1978 Total Connecticut 234 468 3 835 Delaware 10 10 Maine 4,290 16,760 2,130 4 1 ?n Massachusetts 125 805 226 260 63 04? Michigan 100 100 New Hampshire 1,120 725 New Jersey 56 035 74,910 62,755 193 700 204 330 New York 76,450 162,275 Pennsylvania 8,552 Rhode Island 105 550 655 Vermont 10,925 Total ,990. Peninsula. In northwestern Wiscon- sin, heavy to severe defoliation oc- curred on 15,000 acres with light to moderate defoliation on another 15,000 acres. This outbreak is ex- pected to increase and spread east- ward next year. Populations declined this year in Minnesota and are ex- pected to do so again in 1980. Moderate to heavy damage occurred on 15,500 acres this year. Status of Diseases VMiite pine blister rust, caused by the fungus Cronartium ribicola Fischer, was the most damaging dis- ease of white pine in the North- eastern Region. However, with proper site selection and the use of rust resistant planting stock, white pine can be grown successfully. In 1979, 12,000 rust resistant seedlings were planted on two National Forests in the Lake States and at least twice that number are scheduled to be planted in 1980. Vascular wilts. Dutch elm disease, caused by Ceratocystis w/m/'(Buism.) C. Mor., is present throughout most of the Northeastern Region and, in 1979, continued to kill elms where they still existed. Integrated control programs, which may include sur- veys, sanitation, root graft control, chemical injection, and pruning of affected limbs, enabled communities to reduce their annual elm mortality. In communities without such programs and in the forest where Jack pine bud worm infestations. Other insects (R-9
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