File:Forest insect and disease conditions in the United States 1979 (1981) (20353347828).jpg

Title: Forest insect and disease conditions in the United States 1979
Identifier: CAT31125142 (find matches)
Year: 1981 (1980s)
Authors: United States. Forest Service; Pronos, John, 1944-; Hoffard, Bill
Subjects: Insect pests United States
Publisher: (Washington, D. C. ?) : U. S. Dept. of Agriculture, Forest Service
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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741 acres of scattered/ps kill were also aerially detected 10 miles north- west of Kiana along the Kobuk River. Cottonwood leaf beetle, Chrysomela scripta F. Leaf beetle populations were low in southeast Alaska. No visible defoliation was detected from the air; however, several homeowners in the Men- denhall Valley north of Juneau reported moderate defoliation of or- namental cottonwoods. Cedar mortality. Small patches of dying Alaska yellow cedar and western red cedar were readily ob- served throughout the central third of southeast Alaska. While growing site, root disease, and possiby Phloeosinus bark beetles are suspected as interacting causes of cedar mortality, the problem will be evaluated in greater depth during 1980. Currently, the most severely affected areas are the Stikine Area, the northern part of the Ketchikan Area, and Peril Strait in the Chatham Area. Willow leaf miner, Rhynchaenus rufipes (LeC). In 1979, aerial sur- veys detected 3,894 acres of defoli- ated willow along the Innoko River, due eastof Anvik. Ground inspec- tion of the affected area showed that a small weevil was responsible for the defoliation. The weevil was iden- tified diSR. rufipes, a new State record for Alaska. This species oc- curs from Newfoundland to Aklavid, Northwest Territory (now to northern Alaska). Larvae mine leaves of willow, elm, alder, apple, cherry, and birch. SiM*iice budmoth, Zeiraphera sp. In 1979, aerial surveys detected 2,805 acres of heavy white spruce defolia- tion approximately 81 miles north- west of Dillingham between Lake Kulik and Grant Lake. A ground check of the affected area revealed an undetermined species of Zeiraphera. All the white spruce new growth and portions of the old growth were defoliated in all age classes. Spruce budworm, Choristoneura sp. Similar to last year, ground sur- veys detected visible budworm damage to white spruce in many resi- dential and park areas of Anchorage. The results of pheromone trapping indicated spruce budworm distribu- tion as far north as Fairbanks. However, no visible signs of defolia- tion were observed outside of Anchorage. Spruce budworm life history studies were undertaken throughout the 1979 field season. Preliminary results indicated a species complex; 5 percent of the population being C. biennis Free, and the remainder possibly being C.fiimiferana Free. Efforts will be continued to delineate the budworm species and the impact of this defoliator complex. Large aspen tortrix, Choristoneura conflictanaCWlk.). For the second year, tortrix populations remained high. In 1979, surveys detected almost total defoliation of quaking aspen of 26,771 acres; an increase of 5,651 acres(21 percent) over the area defoliated in 1978. The ma- jority of the infestation is still located
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Willows defoliated by willow leaf miner. 70

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