Snow Molds - Field Guide to Diseases and Insect Pests of Idaho and Montana Forests

Snow Molds

Herpotrichia coulteri (Peck) Bose, Herpoirichia juniperi (Duby) Petr.

From: Field Guide to Diseases and Insect Pests of Idaho and Montana Forests, USDA Forest Service Northern Region, Publication Number R1-89-54

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.

Image Unavailable

Figure 104 - Snow Mold produces a
thick mat of brown to black mycelium on
foliage which was buried under snow.

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.

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