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Di-Syston is a systemic insecticide that has been registered for years for use on a number of different vegetables but I don't think it is...
It could be winter leaf drop. Have you had a lot of sunny days lately? The sun will warm the leaves to a higher temperature than the air...
In addition to humidity and wind, there are a other differences I can think of between indoor trees in containers and outdoor trees in the ground...
I have wondered about this too. I don't have the answer but I wonder if wind plays a role. When the sun shines on leaves indoors the leaf...