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Madrone (Arbutus)-Madrone leafminer Marmara arbutiella See: Common Pests of Nursery Crops Pest description and crop damage The adult is a moth. Larvae of this leaf- and twig-mining moth blaze sinuous, serpentine mines across the undersides of leaves. Alth ...

Maple (Acer)-Aphid Includes Norway maple aphid (Periphyllus lyropictus) See: Common Pests of Nursery Crops Pest description and crop damage These aphids are black, soft-body insects on leaves; sticky secretions on leaves and under trees. Management-chemic ...

Maple (Acer)-Cottony maple scale Pulvinaria innumerabilis See: Common Pests of Nursery Crops Pest description and crop damage Mature cottony maple scale are small, flat, oval, brown insects 0.25 to 0.375 inch in diameter. The "cotton" is really ...

Maple (Acer)-Maple bladdergall mite Vasates quadripedes Pest description and crop damage The maple bladdergall mite is a tiny eriophyid mite that feeds on the underside of leaves. Infested leaves initially develop small depressions which soon grow into br ...

Maple (Acer)-Maple shoot moth Proteoteras aesculana Pest description and crop damage Maple tip moth, Proteoteras aesculana Riley, also known as maple shoot borer and maple twig borer, is an occasional pest in nursery production in the Pacific Northwest. T ...

Maple (Acer)-Western flower thrips Frankliniella occidentalis Pest description and crop damage Adults are yellow to yellow-brown, 0.05 inch long, narrow, with wings. Larvae are smaller and wingless. Both stages feed on developing growth causing leaf disto ...

Mountain ash (Sorbus)-Aphid Several species See: Common Pests of Nursery Crops Mountain ash (Sorbus) Aphid ...

Mountain ash (Sorbus)-Pear leaf blister mite Eriophyes pyri Pest description and crop damage The leaf blister mite is a very tiny, white, sausage-shape eriophyid mite. They are seldom visible to the unaided eye. Eriophyid mite feeding on the underside of ...

Narcissus (Narcissus)-Narcissus bulb fly Merodon equestris Pest description and crop damage The adult narcissus bulb fly is about 0.5 inch long and closely resembles a small bumblebee. The larva is yellowish-white and 0.75 inch long. The maggots burrow in ...

Oak, Garry (Quercus)-Leaf and twig gall Includes Andricus californicus Bassettia ligni Besbicus mirabilis Neuroterus saltatorius Pest description and crop damage Leaf galls are caused by the feeding of several species of oak gall wasp larvae. Typical gall ...