Snow Molds
From Bugwoodwiki
Hagle, S.K; S. Tunnock; K.E. Gibson; and C.J. Gilligan. 1987. Field Guide to Diseases and Insect Pests of Idaho and Montana Forests. U.S. Department of Agriculture, Forest Service. State and Private Forestry, Northern Region. Missoula, Montana. Reprint 1990. Publication Number R1-89-54.
Contents |
Hosts
H. coulteri: Pines – H. juniperi; Grand fir, subalpine fir, juniper, Engelmann spruce, western hemlock, pines.
Distribution
High elevation sites.
Damage
Foliage which is covered with snow is infected and killed resulting in branch death and occasional death of seedlings.
Identification
Needles are matted together by thick growth of gray, black, or brown mycelium on portions of the tree which were covered by snow (fig. 104). The appearance is unique and easily recognized.
Similar damages
The dark mat of mycelium should readily separate snow molds from other types of foliage damage.
References
- Anonymous. 1982. For. Insect & disease identification and management. USDA For. Serv.,Northern Region; Idaho Dept. of Lands, Insect and Disease Control; Montana Dept. of State Lands, Division of Forestry. 192 p.
- Bega, R. V. 1978. Diseases of Pacific Coast conifers. USDA For. Serv. Ag. Hndbk. No. 521, 206 p.
- Funk, A. 1985. Foliar fungi of western trees. Canadian Forestry Service, Pacific Forest Research Centre BC-X-265, 159 p.
- Hepting, G. E. 1971. Diseases of forest and shade trees of the United States. USDA For. Serv. Ag. Hndbk. No. 386, 658 p.
