Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00001745
11/12/99
Crimson Erineum Mite
Crimson erineum mites are closely related to bladder gall
mites. Silver maple is most commonly affected but so are
Norway maple and boxelder.
The mites overwinter in protected places on the bark of
tree trunks. In the spring they move to the developing
leaves. The mite begin to feed causing the formation of
red, felt-like patches (Vis. 1) on the undersides of leaves.
Eggs are laid in the galls and the resulting offspring move
to unaffected leaves and cause more galls to form. The
mites stop infesting new leaves in mid-summer.
Leaves closest to the overwintering sites are most heavily
infested. Control measures are usually not needed.
This information is for educational purposes only. References
to commercial products or trade names does not imply
endorsement by MSU Extension or bias against those not
mentioned. This information becomes public property upon
publication and may be printed verbatim with credit to MSU
Extension. Reprinting cannot be used to endorse or advertise
a commercial product or company.
This file was generated from data base ZZ on 01/19/00.
Data base ZZ was last revised on 11/12/99.
For more information about this data base or its contents please contact
heatley@msue.msu.edu . Please read our
disclaimer for important
information about using our site.