Tree Rain following up on the question by Jay- I observed in
my yard last night a tree that appeared to be raining - catalpa tree.
This was at the end of the day and I watched for over 30 minutes as the
sun was shinning behind the tree and it looked like a light rain or
someone had turned the sprinlker on. this continued until the sun went
down and I could no longer see the rain - so I went and stood under the
tree and could still feel it - but it was not sticky as sap or as
honeydew , it was like water. This tree had just been deleafed by the
catalpa worms. My husband thought I was crazy until he came and saw it
It does sound like herbivory damage resulting in sap raining down
from the injuries.
Anthony R. Brach, PhD
Missouri Botanical Garden
c/o Harvard Univ. Herbaria
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Update: June 2012