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Common Insects & Mites
Aphids
Asian lady beetle
Bark beetles
Brown marmorated stink bug
Brown soft scale
California gallfly
Conifer aphids
Cottony camellia scale
Cutworms and loopers
Earwigs
Eriophyid mites
Exotic longhorned beetles
Fall webworm
Inchworms
Leafhoppers
Leafminers
Leafrollers
Lecanium scale
Oystershell scale
Pamphilid sawflies
Pear slug
Root weevils
Sapsucker damage
Shothole borer
Skeletonizers
Slugs
Sowbugs, pillbugs, and millipedes
Spider mites
Spotted wing Drosophila (SWD)
Tent caterpillars
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Caption: California gallfly "oak apples"
Photo by: R.S. Byther
Common Insects & Mites : California gallfly
(revision date: 4/30/2013)
Use Integrated Pest Management (IPM) for successful plant problem management.
Biology
The gall of this cynipid wasp larva is the largest and most conspicuous of the galls on oak. It is a twig gall that is often called 'oak apple'. It starts out green and gradually becomes red on the sunny side. Later in the season, the gall turns brown or grayish just before the adult wasps chew their way out. The gall does no apparent damage to the tree and is easily removed without harming the twig. The gall is generally round and sometimes kidney-shaped. During its development, the gall may host up to a dozen larvae.
Management Options
Non-Chemical Management
Hand remove where practical.
Select non-chemical management options as your first choice!
Chemical Management
IMPORTANT:
Visit Home and Garden Fact Sheets for more information on using pesticides
None recommended.
Images
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Caption: California gallfly "oak apples"
Photo by: R.S. Byther