For how long do systemics remain within a plant? Does it depend upon =
the plant, weather, etc? I am having (for the first time ever) a =
terrible time w/ jap. beetles on my "spicy lights" Northern lights =
azalea. The beetles don't bother any other azalea, just this one. =
Spraying w/ a systemic did not help at all -- the little buggers just =
kept on eating. I tried the old can of soapy water and flicking them in =
bit but it's too much all the time and I thought a systemic would work =
(usually I don't like to use chemicals)
Any ideas? TIA
graf@northnet.org
-- All truth passes through three stages:
First, it is ridiculed; second, it is violently opposed; third, =
it is accepted as being self-evident.
=
--Schopenhauer
-- Don't arrange your life so that you're all alone in the middle of it.
-- Why is it we must oppress others so that we may live in certainty?
.
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Just an observation. I use a systemic insecticide on my roses and still have to
hand pick japanese beetles twice a day. This is not definative proof that they
are immune, I might have to pick even more if I didn't use them, but it sure
doesn't solve the problem completely. They especially like yellow and white
roses.
Esther
Stephen Graf
Please respond to Gardens & Gardening
To: GARDENS@LSV.UKY.EDU
cc: (bcc: Esther Czekalski/US/BULL)
Subject: systemic insecticides
For how long do systemics remain within a plant? Does it depend upon the plant,
weather, etc? I am having (for the first time ever) a terrible time w/ jap.
beetles on my "spicy lights" Northern lights azalea. The beetles don't bother
any other azalea, just this one. Spraying w/ a systemic did not help at all --
the little buggers just kept on eating. I tried the old can of soapy water and
flicking them in bit but it's too much all the time and I thought a systemic
would work (usually I don't like to use chemicals)
Any ideas? TIA
graf@northnet.org
-- All truth passes through three stages:
First, it is ridiculed; second, it is violently opposed; third, it is
accepted as being self-evident.
--Schopenhauer
-- Don't arrange your life so that you're all alone in the middle of it.
-- Why is it we must oppress others so that we may live in certainty?
.
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Thanks Esther. I guess that's the problem. A picking I will go.
Date: Monday, July 19, 1999 6:38 AM
Subject: Re: systemic insecticides
> Just an observation. I use a systemic insecticide on my roses and still
have to
> hand pick japanese beetles twice a day. This is not definative proof that
they
> are immune, I might have to pick even more if I didn't use them, but it
sure
> doesn't solve the problem completely. They especially like yellow and
white
plant,
> weather, etc? I am having (for the first time ever) a terrible time w/
jap.
> beetles on my "spicy lights" Northern lights azalea. The beetles don't
bother
> any other azalea, just this one. Spraying w/ a systemic did not help at
all --
> the little buggers just kept on eating. I tried the old can of soapy water
and
> flicking them in bit but it's too much all the time and I thought a
systemic
is
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On Sun, 18 Jul 1999 14:28:34 -0700 Stephen Graf
wrote:
> For how long do systemics remain within a plant?
It depends primarily on the type of systemic, in other words it's a
chemical issue. The two most commonly used foliar systemic
insecticides, dimethoate (Cygon) and acephate (Orthene) last about 14
to 20 days in foliage. They do not translocate far from their point of
absorption thus any new growth after application is unprotected. The
newest and very heavily used systemic, imadicloprid, (Merit) is a root
absorbed system and last up to six months or longer. Perhaps the most
widely used systemic of the past was aldicarb (Temik). It was also
root absorbed and lasted about six months or so. It was very toxic and
its label has been withdrawn for most crops.
Does it depend upon > the plant, weather, etc? I am having (for the
first time ever) a > terrible time w/ jap. beetles on my "spicy lights"
Northern lights > azalea. The beetles don't bother any other azalea,
just this one. > Spraying w/ a systemic did not help at all -- the
little buggers just > kept on eating.
The systemic may have worked on those beetles feeding on the foliage
but this doesn't stop new hoards of beetles from arriving and
continuing to feed. If there is a very large population of pest
insects chemical pesticides are not very effective on a single plant.
You kill many but more keep coming. Better is to barrier off the plant
with fine mesh netting or window screening. Many greenhouses here in
Maryland are beginning to use screening as a form of pest exclusion.
We have a very small population of Japanese beetles this year here in
my area, probably due to our dry summer last year which prevented a lot
of the grubs from surviving. Still, we are not out of the woods. Our
hot, dry weather has meant problems with mites, leafhoppers and thrips.
If it ain't one bug it's another. :-)
---------------------
Bob (always buggy) Stewart
Southern Maryland (USDA Zone 7)
rs72@umail.umd.edu
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Thanks for the info, Bob.
Date: Monday, July 19, 1999 5:43 PM
Subject: Re: systemic insecticides
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