Re: CULT: Borer, spraying, and the sun
- To: Multiple recipients of list <email@example.com>
- Subject: Re: CULT: Borer, spraying, and the sun
- From: Bill Shear <BILLS@hsc.edu>
- Date: Wed, 4 Feb 1998 06:54:51 -0700 (MST)
>And I would say from experience that if you use liquid dishsoap as a sticker
>and spray a very warm day or in very strong sun you risk burning your irises
>badly and while they will recover, they will be sad plants and sad looking
>plants for a good while. This also holds for spraying them with insecticidal
>Anyone know if pyrethins have any effect against larvae of anything? Or the
>soaps, for that matter?
I've had bad results with insecticidal soaps burning plants both in the
garden and in the greenhouse. I don't use them anymore because they seem
also to be relatively ineffectual against such things as whitefly and
mealybugs, which is what I wanted them to kill.
Pyrethrins natural and synthetic are contact poisons, as are insecticidal
soaps. Pyrethrins have a very short (few days at most) life in the
environment, so are relatively safe. I don't know of any adverse effects
on humans. Raid relies mostly on pyrethrins. I've found their garden
formulation to be good for aphids and whitefly.
Department of Biology
Hampden-Sydney VA 23943