In the absence of this parasite there can be large increases of aerial colonies and woolly aphids may be found in the calyx of the apple. Outbreaks of woolly apple aphid are most common following the use of pyrethroids, which destroys its natural enemies. The delayed dormant application should control woolly apple aphids. Foliage treatments may be necessary for young trees with severe infestations. 4EC Label rates .
Applications made during the foliage season are harmful to beneficials.
Do not apply within this many days of harvest. Permit required from county agricultural commissioner for purchase or use. The Regents of the University of California. All rights reserved. For noncommercial purposes only, any Web site may link directly to this page or photo file.