Brown almond mites reside on woody portions of their fruit tree hosts, from which they make excursions to feed on leaves only during favorable periods of the day. Changes in temperature and possibly in sunlight greatly affect their migrations back and forth on almond trees. Their excursions for food introduce serious errors in sampling whenever attempts are made to compare different populations on a basis of mites counted in samples of plucked leaves.
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Summers et al. (1952) studied this question.
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