I'm still spraying with Neem Oil every couple of weeks and haven't had any
problems. The horticultural formulas available at Lowes (but not HD...at
least not mine) is what I'm using...but I guess since the oil simply
smothers the aphids, the type of oil probably isn't all that important.

I spray after the sun goes behind the other houses so there is no direct
sunlight and the air has started cooling off but before it goes down and I
can't see anymore.

First time I used it, 1,000's of aphids were dead dead dead when I checked
the plant the next morning.

John
Austin, Tex -- where it definately gets over that 90o mark

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"lbbs" wrote in message
...
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.