In article , "lbbs"
wrote:

I have a bad case of aphids on my plum tree. Would it be bad for the tree
if I spayed oil on the tree to kill them and then a day late, spray the tree
with a water gun to wash off the oil. I tried insecticide soap, but did
not help much.

Have you tried squirting the tree with the hose yet? Try it. It'll knock a
lot of the
aphids off. Then decide if you need to resort to other things.

Jan