On Jun 7, 7:47�am, wrote:
I have seven birch trees about 10 years old and 20 ft high planted in
two groups of threes and one single. �They are planted in Mississauga,
Ontario. �In spring the tree leaves emerged normally and all was
well. �About four weeks ago the trunk about 5 feet from the top of the
trees started to bend quite severely. �This happened to one after the
other and all seven are now bent. �The leaves on the lower portion of
the tree are fine. �On the upper portion where the trunk is bent the
leaves appear to be fine as well however their development is about 3
weeks behind the lower leaves. �The leaves do not appear to have any
sign of bugs or other symptoms. �Other birch treees in the
neighbourhood are fine and not bending.

Any help would be appreciated.

Tom

Sounds like the trees were affected by a sudden frost just as the buds
were opening... the entire north east experienced the same weather
condition and many fruit trees were damaged. Birch would be affected
by a sudden frost especially if a particularly wet spring and if
planted in a wet spot. You may lose the very top branches of those
trees (the thinner upper branches suffered frost bite) but those trees
should make a full recovery... I have birches that experienced the
same here in NY's Catskill region.