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Forest Pests of North America
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Table 4. –
Comparison of Needle Problems of Douglas-Fir.

Disease Symptoms Location Fruiting Bodies Description Fruiting Season Needles Shed
Rhabdocline Needle Cast Red-brown banding Underside; either side of midrib Tan with flaps of epidermis Fall and spring 12-15 months following infection
Swiss Needle Cast General chlorosis or red-brown tips Underside, emerging from stomata in line on either side of midrib Round, black, tiny Year round 1-4 years following infection
Insect     Appearance Season present  
Douglas-Fir Needle Midge Yellow to red spots with swelling Within galls inside needles Tiny, yellow, legless maggots Spring to late summer Late summer
Cooley Spruce Gall Adelgid Yellow spots, kinked needles Upper surface new growth White tufts of wax cover adult adelgid; tiny black crawlers in spring Spring to fall  

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University of Georgia The Bugwood Network Forestry Images   The Bugwood Network and ForestryImages Image Archive and Database Systems
The University of Georgia - Warnell School of Forest Resources and
College of Agricultural and Environmental Sciences - Dept. of Entomology
Last updated on Tuesday, July 02, 2002 at 11:40 AM
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