Will SEVIN kill web worms in trees?
Kathy Brunetti -- see sig
> My trees have web worms all thru their branches, will sevin work on
> them?
>
Yes, but...
Sevin (carbaryl) is a contact poison that works well against
caterpillar-type creatures.. It must actually contact the worms.
So if your worms are deeply embedded in the webs, it might not work unless
you figure out some way to open the webs.Carbaryl is also toxic to a wide
array of beneficial insects. You don't want to control your webworms, only
to have some other pest explode because you wiped out its natural
enemies. If you decide theat carbaryl is what you want ot use, apply it
early in the morning, when temperatures are cool & beneficials are less
likely to be active. Once the spray has dried, you are less likely to
impact beneficials, although some will still be affected.
--
Kathy Brunetti
The From is a fake, courtesy of my ISP. Try this one that humans can read:
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Ford
them?
Thank you!
m&v
Yes, and the birds, and tree frogs...You can effectively kill the
webworms with BtK. Mix it up into a sprayer and spray the foliage. The
worms will eat the leaf and die of disease. This is called a biological
control and will only effect the target pests, not birds or other
wildlife. If you go buy it, make sure you get a wetable form. It
comes in powder and liquid, but not all the powders are wetable. If
you can only get a powder which is not wetable, you can put a
tablespoon of insecticidal soap in with it to break the leaf surface
tension, and at the same time you are adding a surfactant making the
dry material, wetable. Buy both at a garden center, not the home
centers. Home centers usually don't carry BtK. One brand name is
Dipel.
Victoria
Myrth
It's a lot safer to use for you and the environment. Most home centers and
nurserys in the US carry it under one name or the other. Just read the
directions and apply as they tell you.
Nick LaRocca
m&v <ani...@ix.netcom.com> wrote in article
<6q9gf1$i...@dfw-ixnews6.ix.netcom.com>...
> In <35C7A8B8...@ameritech.net> Ford <rf...@ameritech.net> writes:
>
> >
> >My trees have web worms all thru their branches, will sevin work on
> >them?
> >
> >Thank you!
> >
> Yes, and the birds,
This is partial misinformation. There is no evidence that carbaryl (the
active ingredient in Sevin) is particularly toxic to birds. The LD50
(which is the scientific indication of toxicity) for carbaryl would
indicate just the opposite.
Carbaryl is very toxic to BEES (not birds) and should not be used on a
widespread basis or at times when bees are active.
Carbaryl is also toxic to aquatic life and should not be applied in or
around waterways.
The label should indicate these contraindications.
> and tree frogs...You can effectively kill the
> webworms with BtK. Mix it up into a sprayer and spray the foliage. The
> worms will eat the leaf and die of disease. This is called a biological
> control and will only effect the target pests, not birds or other
> wildlife.
Again, this is partial misinformation. It is important to provide a
balanced view. Bt is indeed a biological control, but it does have side
effects. Bt has proven toxic to non-target insects, especially other moth
and butterfly larvae. Some endangered /threatened species have
unfortunately been found susceptible. Although Bt may persist for only a
short time, the already low populations of these species are cause for
concern.
Bt has also produced indirect effects on bird and mammal species (including
reduction in young) because of reduction in arthropods that serve as their
food supply.
Both Bt and Sevin should be treated like any other artificial controls and
only used where and when needed, preferably as part of an overall IPM
approach. They should not be used as a general cover spray or in areas
where desirable larvae and other non-target species are feeding or may be
present (which could include almost all naturalized areas and some
cultivated ones as well).
--
Nick - NJ - Zone 7a
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"Everything should be made as simple as possible, but not simpler"
- Albert Einstein
CricketRAH
other than earthers) and removed them from my young maple and cut the branches
on my flowering plum and burned them.
Cricket
Upstate NY/VT line
FarmerDill
Amen: It is about time some of us stared defending butterflys like polinator
does bees. Dusts of any pesticide are more difficult to precisely target than
sprays. Spraying is preferable, try to compesate for known hazards. (use Sevin
in late evening after bees quit working) Don't let Bt drift into your neighbors
butterfly garden. Use only what is absolutely necessary to to remove the
targeted pest........
Dill
Eric White
>Nasty aren't they? Can you remove them by hand? I donned gloves (hate worms
>other than earthers) and removed them from my young maple and cut the branches
>on my flowering plum and burned them.
Mechanical removal is desirable for more than one reason, not the least of
which is aesthetic. Applying either chem or organic controls still leaves the
ugly webs in the tree.
If your trees/webs are within reach of a ladder and extension "lopper", by all
means use that approach. The caterpillar infestations are relatively
localized to individual branches, whereas sprays are at their most useful in a
wide coverage or broadcast situation.
Got a metal bucket? Wet the cuttings down with a bit of BBQ charcoal lighter
and flame on! Recommend against roasting marshmallows in the result...
I also recommend against walking the branches indoors to your fireplace.
Spousal units tend to get excited at the potential for a trail of wigglers
through the LR.
If you're interested, look for the egg case on the branch. It's too late to
do anything about it, as they've already hatched, but once you see one you'll
know what it is for the future. It's valuable info for a young tree that you
can inspect thoroughly in the spring, and which needs its energy.
Look for a brownish putty-like band about 3/8" wide on a branch where it's
about the diameter of your little finger. In this case (no pun intended), the
surface will look porous since the individual eggs have been burst open.
You'll have to envision what that looks like with all of them still closed.
The case is easy to peel off with your fingernail.
Happy hunting!
EW
Eric
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