Diseases and Pests in Michigan (MI)

Honeylocust Plant Bug

Honeylocust plant bugs injure the tree by feeding on the sap, which results in distorted and deformed leaves. More…

Honeylocust Spider Mite

The honeylocust spider mite is a warm season mite that causes a bronzing discoloration on honeylocust trees by feeding on the underside of the leaf surface. More…

Japanese Beetle (Lawn)

The Japanese beetle spends much of its life in the soil underneath your lawn as a grub where it feeds on lawn roots. Where their numbers are large, turf grass can be killed. More…

Japanese Beetle (Tree)

Japanese beetles are skeletonizers, which mean they eat the “meat” of leaves, leaving only the veins behind. They also feed on both flowers and fruit. More…

Lecanium Scale

Lecanium scale represents a group of common soft scales that infest a wide range of tree species. They attach themselves to the leaves and twigs of trees and shrubs and feed on the plant nutrients. More…

Oak Wilt North

Oak wilt is a vascular wilt disease caused by the fungus Ceratocystis fagacearum. This fungus grows in the water conducting vessels of the tree, which kills the tree. More…

Pine Needle Scale

Pine needle scale is a small armored scale that feeds on the sugars contained in the needles of pines, spruce and fir. The insect attaches itself to the needle and produces a hard waxy shell to protect itself from predators and environmental conditions. More…

Pine Wilt

Pine wilt is a fatal disease of pine caused by the pine wilt nematode. Nematodes are microscopic, worm-like organisms that grow inside the tree’s water conducting tissue causing rapid death. More…

Rhizosphera Needlecast

Rhizosphaera needlecast (Rhizosphaera kalkhoffii) is a fungal disease of spruce trees that affects trees growing outside of their native range. Rhizosphaera starts on the inner and lower growth and progresses upward through the tree. More…

Spruce Spider Mite

Spruce spider mites (Oligonychus ununguis) are among the most devastating pests of common varieties of spruce trees and other conifers. This pest is most active in the cool spring and fall when it feeds on the needles of conifers, causing a bronze or rust coloration to the needles and potential leaf drop. More…

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