Q: Ins. soap harming plants?

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Q: Ins. soap harming plants?

Post by Jeff Hugh » Tue, 14 Jun 1994 23:51:28



After reading this newsgroup I thought I would try insecticidal soap to rid
my flowers from unwanted pests.  I bought the Safers Insecticidal Soap ready
to use.  After spraying it on several plants including glads and roses all
of them started to wilt wihtin a couple of hours.  Is this normal?  I took
a hose and washed them all down and they are doing better but the edges of
the flowers have curled.  I also noticed this after making my own soap a few
weeks ago.  Any suggestions?

Also I noticed Safers Insecticidal Soap does not mention it can be used in
the Garden on my veggies.  In fact it says not to use on foodstuff.  If I
recall correctly some earlier posts suggested doing that.  Any comments?

One last question on a different matter.  My crooked neck squash plants have
started to bear several times and each time the squash will get 3 or four
inches long then turn black and fall off.  Does anyone know why this is
happening?  

Thanks in advance for the help.

--

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Q: Ins. soap harming plants?

Post by Piri » Fri, 17 Jun 1994 10:09:47


Quote:

> After reading this newsgroup I thought I would try insecticidal soap to rid
> my flowers from unwanted pests.  I bought the Safers Insecticidal Soap ready
> to use.  After spraying it on several plants including glads and roses all
> of them started to wilt wihtin a couple of hours.  Is this normal?  I took
> a hose and washed them all down and they are doing better but the edges of
> the flowers have curled.  I also noticed this after making my own soap a few
> weeks ago.  Any suggestions?

> Also I noticed Safers Insecticidal Soap does not mention it can be used in
> the garden on my veggies.  In fact it says not to use on foodstuff.  If I
> recall correctly some earlier posts suggested doing that.  Any comments?

> One last question on a different matter.  My crooked neck squash plants have
> started to bear several times and each time the squash will get 3 or four
> inches long then turn black and fall off.  Does anyone know why this is
> happening?  

If you haven't seen this already....

In my experience, Safers is too strong a concentrate. I'd dilute it
just a bit more. Also you should not spray soaps on to plants in full
sun, they can burn pretty easily. Do it in early morning or when
it's a bit overcast.

I haven't had any problem using insecticial soaps on veggies
(although, I haven't used any soaps this year as I have quite a few
ladybug tenants).  The particular smell of Safers soaps is a turn off
to me, I never liked using it just before harvest.

Your squash may need better pollination.  I had that problem last
year, the weather never perked up enough to get male and female
flowers to open at the same time. Hand pollinate if you don't see
bees around (ie if its cool or rainy).  Get the pollen from the male
flower and rub it all over the female flower insides. You need to do
this while its still "Daylight" and the flowers are still open, as
the female flower starts to die by the end of the day and will not be
receptive to any kind of flirtation or seduction after that point.

A weeding I will go...
--------------------------------------------------------------  
Ngai Kwan

                <<If you see a loose marble, it's mine.>>

 
 
 

Q: Ins. soap harming plants?

Post by Mucky » Sat, 18 Jun 1994 07:15:06


Glad to see SOMEONE reads labels!  Insecticidal soap works by
dissolving the exoskeleton of the soft-bodied insect and that causes
them to dry up.  The problem is that the cellulose cell wall of plant
cells closely resembles cutin, the material that makes up the
exoskeleton of insects.  Both are waxes.  In some plants,
inseciticidal soap will dissolve plant cell walls; therefore the
crisp edges you noticed.  We in the trade call it marginal burn.  
The label states some of the plants that suffer from an application
of insecticidal soap, but no manufacturer can test all cultivated
plants....we'd be paying many more $$ than we do if they tried to do
that.