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Ornamentals and Turf |
Recently we received a plant sample containing oak spider mites. Occasionally the oak spider mite becomes very abundant and cause bronzing and possible defoliation by mid summer. The oak spider mite is in the same genus (Oligonychus) as the southern red mite and the spruce spider mite. Apparently a number of coincidentally-occurring factors made this a good year for the oak spider mite. This mite will not feed on the twigs or stems of oak, only the green leaves. It evidently overwinters as a nonfeeding hibernating stage or as eggs on the fallen leaves and on the twigs. There is probably more damage to the lower leaves. Relatively humid weather encourages entomopathic fungi (Neozygites) to destroy these mites. On a small or specimen tree, insecticidal soap or horticultural oil may be applied in June or while mites are still active. Be sure the tree is not in sun during treatment and not under drought stress. With a widespread infestation, there is probably not much to be done on such a large scale. Hopefully, it will not reoccur next year and damage to the tree will be minimal. These pesticides are good for commercial application also. Nurseries may use optional miticides, if desired.
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Last modified on June 28, 2004 by Stephen J. Toth, Jr.
