Luca expounded:

I have planted a little cherry about a month ago. The tree seems
healthy, only in the last couple of days I noticed several tiny
(4-6mm) green caterpillars (if that is what they are), happily chewing
away some of the new leaves. Some even smaller black spots /dots are
always very close to the area that is being eaten.
These worms seem to like being snug either in a new leaf that still
has to unfold, or in between two adjacent leaves stuck together.
So far the damage to the tree is very small, however, like they say,
better safe than sorry. :-)

Get thee to a store quickly and buy some BT spray (it's bacterium
thuringensis (sp?) a biotoxin that'll give the little canker worms a
stomach ache and kill them). Spray every two weeks for three or four
cycles. If you don't, they'll strip your poor little tree bare within
days.

--
Ann, Gardening in zone 6a
Just south of Boston, MA
********************************