It will be a bit risky even if you use an oil specifically formulated for
during the growing season, sprayed in the evening of a not-so-hot day. I'd wash
it off the next morning, not wait a whole day. The oil only works on insects it
covers, and has no residual effect.
Better you should use an oil spray next year early in the season, and figure out
why your tree is so attractive to pests (overdosed with nitrogen fertilizer is
possibility, water stress another).
Regular blasts of water, followed by foliar sprays of seaweed might be a safer
Pat in Plymouth MI
Any technology distinguishable from magic is insufficiently advanced.
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.
Austin, Tex <-- where it definately gets over that 90o mark
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