COOLEY SPRUCE GALL ADELGID ( Adelges cooleyi ) continued
Fig. 2. Stem mothers making a cottony wax covering on the undersides of Douglas-fir needles
Fig. 3. Damage to Douglas-fir, caused by adelgid feeding, consists of needle bending and discoloration (yellow spots).
Fig. 4. A newly formed gall on blue spruce
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