How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle

Brown mites overwinter as eggs. Eggs are red and spherical but do not have a stalk arising from the tops, as do eggs of the European red mite. They are laid in masses under bark scales and at the base of buds, and hatch at the same time the leaf and flower buds open, usually 1to 2 weeks before European red mite eggs hatch. Hatch is completed before full bloom.

Immature mites feed mainly on underleaf surfaces. During the warmest part of the day, adult brown mites rest and reproduce in woody parts of the tree. When temperatures cool off, they move onto the leaves and feed on both upper and lower leaf surfaces.

Adult females live 2 to 3 weeks and reproduce without mating; there are no males. Brown mites are not active during hotter periods of the summer. Eggs laid during hot weather will not hatch until the following spring, and populations generally decline in midsummer. Usually two or three generations of brown mites occur between February and early June.

Eggs of the brown mite
Eggs of the brown mite

Brown mite nymph
Brown mite nymph


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