European Red Mite (Panonychus ulmi)
Another “warm season” species, this mite attacks deciduous trees and shrubs. It is especially common on flowering fruit trees such as apple/crabapple, cherry, pear, plum, hawthorn, and serviceberry. European red mites overwinter as bright red eggs laid in clusters on branches, limbs and trunk, often in such great number that the bark seems to be covered with red brick dust. Eggs of subsequent generations are laid on the foliage, usually on the lower leaf surface. Following spring egg hatch, there may be several generations per year. Development from egg to adult varies from about 3 weeks at 55 degrees F to less than 1 week at 77 degrees F. All life stages (eggs, immatures, and adults) are brick red. The presence of the overwintering eggs on the bark makes the use of dormant oils an effective control measure (see “Controlling Infestations” section below).