I've been using 409 and Isopropyl alcohol for years. Denatured alchol is a
faster kill. People say "Don't use it! period". I've tried it since I'm and
incurable "Try what they say not to do and see what happens". If the plant
is in poor shape from disease or insects you can probably get it to recover
if it's worth it to you. Otherwise toss it and don't worry about the
insects. Wear gloves when using this especially if you're going to do a
bunch. Denatured alcohol is more toxic to man or beast. It's 95% dtinking
alcohol and 5% wood alcohol which is really toxic. If you wear gloves, don't
inhale for periods of time and don't drink it I really don't see much of a
problem. Plants don't seem to object. If you use isopropyl (least toxic of
the common alcohols) go for the 70% in the drug store or big box store. It
might cost a speck more but the kill rate is better for the buck. I mix 1/2
spray bottle of 409 (somewhere around 20 oz I think, I's have to check) with
1 gal of alcohol. That's about 2 oz/ pt bottle of alcohol. It use it for
weekly spot treatment between major blasts 3-4 times/ yr. Good luck.
Gary

"Frank H. Kirchner" wrote in message
...
I am sending best wishes to you all during this holiday season. With so
many stresses in the world, cultivation of our orchids can point to
directions and attitudes that could benefit society as a whole. If only we
could learn the lessons nature has to teach us!

Enough of the quasi-philiosophical and on to the mundane and pragmatic. I
am trying to cut down on the use of chemicals in the greenhouse for
contolling the various pests and critters that so delight in my orchids.
I recall from a long time ago a mix which I never used of Formula 409 and
isopropyl alcohol. Thoughts regarding its efficacy, proportions,
environmental issues would be appreciated.

Thank you in advance and again Happy Holidays!

Frank H. Kirchner