File:Forest insect and disease conditions in the United States 1979 (1981) (19920414133).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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status of Insects - Hawaii Eurasian pine aphid, Pin ens pini Koch. Aphid populations declined sharply on Molokai and Maui, and pine plantations began to recover. A Chamaemyiid predator, Leiicopis (Neoleucopis) obscura Hal., was in- troduced from France in 1976 and appeared to be responsible. It also became established on Kauai, but the aphid remained confined to its original urban infestation site and did not spread to pine plantations 23 miles away. Eucalyptus longhorn beetle. Phorancantha semipunctata Fabr. Beetle activity continued despite im- proved growing conditions. The in- sect had been a significant factor in the mortality of drought-stressed Eucalyptus robusta and E. saligna in older stands planted for watershed improvement, but extensive losses have not occurred in commercial plantations. Koa moth, Scotorythra paludicola (Butler). The outbreak of 1977 sub- sided, and stands on the infested 19,000 acres were in various stages of recovery. Subsequent mortality rose from 30 to 50 percent in young stands, top kill deformed most of the remaining trees, and efforts to pro- duce high-quality native koa were greatly set back. Formosan subterranean termite, Coptotennes formoscmus Shiraki. This termite was responsible for unexpected failures of Norfolk Is- land pine and Australian kauri in ur- ban areas and parks. Lack of exter- nal indicators made detection of weakened trees a major problem. Status of Diseases - California Dwarf mistletoes, A rceuthobium spp. The dwarf mistletoes were again very prevalent and damaging to all commercial conifers in California ex- cept incense-cedar. Vegetation management in many recreation areas has been overlooked in the past, and as a result, numerous campgrounds have serious dwarf mistletoe problems in both overstory and understory trees. Annosus root disease, Heterobasi- dion annosum (Fr.) Bref. ( =Fomes annosus (Fr.) Cke.) was again the most serious and common root pathogen affecting all conifer species on land managed for recreation or for timber production. More than one-third of the requests for pest evaluations on National Forest land
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F-7023H5 Dying Jeffrey pine on the margin of ex- panding annosus root rot center. 36

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