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Plant NameTypeDescription 
Leaf gallKinnikinnickDiseaseLeaf gall of kinnikinnick is caused by the same fungus which causes leaf and flower gall of azalea. Initially, infected plant parts show a thickening and then gradually become fleshy in appearance. Infected leaves and flowers thicken into greenish to pinkish galls. As the galls mature, they become covered with a dense white coating of fungal spores. Galls finally become brown and woody. Healthy plants can easily tolerate considerable amounts of galling without serious damage.
Leaf spotKinnikinnickDiseaseLeaf spot is a fungal disease. Symptoms include development of brown, necrotic spots on leaves. The fungus most likely overwinters on infected leaves and possibly on twigs. The disease is favored by cool, wet conditions and is spread by splashing water.
RustKinnikinnickDiseaseKinnikinnick rust is a fungal disease of the leaves which requires an alternate host (spruce) to complete its life cycle. Symptoms of rust on kinnikinnick are seen in late spring, when the undersides of leaves develop an orange to brownish powdery coating of spores. Severe infections can cause leaves to drop. This rust fungus also causes a broom rust of spruce. Infected spruce trees develop large golden yellow witches'-brooms which may reach up to two yards in height.
Aphid (Manzanita leafgall aphid)KinnikinnickInsectThe manzanita leafgall aphid feeds on the leaves of kinnikinnick and other manzanita species (Arctostaphylos spp.). The aphids are grayish or greenish in color and prefer new growth. Aphid feeding causes the leaves to thicken and form bright red galls. Older galls turn brown. Severe infestations may slow the growth of the plant. Non-gall-forming aphids may also be seen occasionally on kinnikinnick. They are greenish, soft-bodied insects that may feed on leaves or stems. Honeydew, a sweet, sticky material, may be associated with aphid feeding. It may attract ants or become covered with a growth of dark sooty mold. Severe infestations may result in leaf and twig dieback.