How To Identify And Control Garden Pests On Grapes And Roses


[MUSIC PLAYING] – I’m John White. Today, we’re going to be talking
about some garden problems that we’ve run across,
and one of them is, with grapes, there is a
little insect that’s active right now in at least the
southern part of the state and that’s the Western
grapeleaf skeletonizer. And the way you find
this little critter is by looking for evidence
of leaves that are beginning to lose their green. So they just become basically a
skeleton, or just what is left is basically the
veins of the leaf, and a lot of the green
foliage has disappeared so to speak almost overnight. When you flip the leaf
over, a lot of times you’ll find the
little caterpillars on the underside of the leaf. They’re yellow with kind of
a blue stripe across them. Usually less than
half an inch in length and they’re usually in
fairly large numbers. So they’re kind of
congregations of them. And they just strip a leaf. The adult is a little
blue-black moth that flies around and lays its eggs. So it can be kind of
periodic or scattered as far as where the damage
shows up on the plant. But as the eggs begin to
hatch and the populations begin to grow, they are
pretty heavy feeders and they will work
their way across a vine. And as they start working
on the vine, a lot of times within just a few
days, they can actually strip a vine of most
of its green foliage. So it is an insect that you want
to get under control before it does a lot of damage. Most of the insecticides
do a good job on it. There are several
of them that are labeled for Western
grapeleaf skeletonizer. If you can catch them early
enough, a lot of times just mechanically
pulling the leaf off that has the worms on it and
just disposing of that leaf. If you can catch
them early enough, that’s really one of the
easy ways to control it. But if it’s really
hit the vine, you may need to come in and
use an insecticide on it. So there are a couple of
different ways to approach them but that is Western
grapeleaf skeletonizer. Very common insect
problem on grapes so we want to be on
the lookout for them. Now let’s go take a look
at some other problems that we have here in the garden. One of the other things we’re
seeing in gardens right now, especially in the
southern part of the state with it being kind of hot
and dry, is spider mites. And beans are notorious for
having spider mite problems. We also see it on maybe
tomatoes and some other plants, but what we want to
look for is what we call a stippling of the leaf. And you can see
these leaves here, how they’ve almost
turned white, and that’s because the spider mite
has a sucking mouth part, and every time he goes
to feed on the leaf, he pulls out the green
chlorophyll tissue and leaves the white stipule. And if all those
stipules come together, the leaf basically
turns white because it’s lost all the chlorophyll in it. And so this is a
leaf that is heavily infested with spider mites. If you look on the
underside of the leaf, you can see a little bit of
the characteristic webbing. And if you take it and bang it
out on a piece of white paper, you can knock some spider
mites off and find them. With our hot, dry weather,
this is the problem, so we’re trying to
build up some moisture. Spraying with plain water. Soap and water mixes will help
to try and keep the spider mites down and keep the
leaves, but if the leaves go into a real severe
chlorotic look where they’ve lost
most of the color, that is going to affect the plant
as far as its production, so we do not want that
to happen to this extent. So we want to get it under
control before this happens. Also, they will attack
the beans themselves, so some of these
small beans, the mites are hitting also and
taking the green out. So again, you aren’t going
to have as flavorful a crop and probably as large a
production as you should. So again, spider mites, we
do want to get under control. There are some insecticides
that can be used but I do want to give
you caution to make sure that you follow the harvest
schedule so that you aren’t spraying insecticide
at the same time that you’re needing to harvest. So you want to watch those
intervals real close. But again, soap and water
does a pretty good job on controlling this. So keep your eye out
for spider mites, not only on vegetables but a lot
of other plants in your garden. Another problem we get a lot
of calls on– and this is kind of state-wide– and this is the little
half-circle cuts out of leaves. And this is on a rose. And this is one of the
most predominant plants that we find this problem
on but you can also find it on some of the
ornamental pears and some of your ornamental
shrubbery around the yard. And this is caused
by a leaf cutter bee. And the leaf cutter bee
is a beneficial insect. It’s a good pollinating insect,
about the size of a housefly. Will come in and cut that
little semicircular piece out. It takes it to its nest, where
it makes a larger enlargement of the nest where it can
go ahead and lay its eggs and develop its young. So it really doesn’t
eat the foliage, it just uses it for
nesting purposes, so insecticides
do not work good. So basic tip here is just, you
know what it is, let it go. It’s next to impossible to
try and kill this insect, and since it’s a beneficial
pollinating insect, there’s not really
a reason to kill it. But just so you can recognize
what the problem is. It doesn’t kill the plant
so there’s not really a need to control it. But again, that’s
the leaf cutter bee. [MUSIC PLAYING]

4 thoughts on “How To Identify And Control Garden Pests On Grapes And Roses

  1. Nice photo's of insects. Talks about effects of insects – visuals good too. Not thorough. Alot of talking but a nice voice – could read this. Pleurotic? Bean pests effects. Harvest schedule. Some of these products esp petroleum based stay in the vegetable.

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