Aceria tenella on Carpinus betulus

Aceria tenella on Carpinus betulus

Observation - Aceria tenella on Carpinus betulus - UK and Ireland. Description: I keyed these out with Redfern & Shirley (1st Edn). These galls on 3 leaves looked rather different from each other, but I think they are probably all caused by the mite A. tenellus. I could not see any mites, but neither were there any larvae which rules

I keyed these out with Redfern & Shirley (1st Edn). These galls on 3 leaves looked rather different from each other, but I think they are probably all caused by the mite A. tenellus. I could not see any mites, but neither were there any larvae which rules out the dipteran Zygiobia carpini which creates similar looking galls, I believe.

The photos are scans that I flipped so both sides of each leaf can be compared. The detailed pic was taken at X 100 mag with a USB microscope.