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This year a greyish white deposit appeared on my three Cypress trees.* At first*I thought it was as a result of Red Spider mites but after spraying with water for a few days which usually takes care of that problem I observed that it was not the case.* The trees looked OK but somewhat darker where the greyish deposits had been.* I had to leave home for a week and upon return and after a very strong wind which occured during our absence the greyish deposits were again present in larger quantity on the windward side of the trees.* I have been spraying them daily with high pressure hose water and they remain green and in some places redish color No other trees* in the area have this problem and there are many in the vicinity.* Any thoughts?