NEWARK, Del. - Delaware
experienced its first sizable out
break of gypsy moths last spring.
'lbis came as.no surprise to en
tomologists and state foresters,
who have been monitoring the
spread of this insect.
Strategy meetings were held
early in the season for represen
tative of local governments,
agencies and communities likely to
be affected by the outbreak. Their
well-laid plans failed, however,
when citizens panicked and started
using a wide variety of control
methods, many of which were
useless because the pests were too
mature, or the procedures used
were simply ineffective.
Gypsy moth caterpillars will be
chomping on tree leaves in some
parts of northern. New Castle
county again next year. According
to those who predict such events,
Delaware’s gypsy moth population
has been growing for several
years. Three hundred acres
reportedly were involved in 1981.
Feeding caused complete
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Del. anti-gypsy moth campaign gears up for ‘B2
defoliation in some cases.
“One defoliation usually doesn't
kill most trees,” says University of
Delaware Extension pesticide
specialist John McDaniel. “But if
it occurs two years in a row, some
may" die.” Reduced tree vigor
seems to be the important factor in
losses caused by this pest.
The insecticide most commonly
used against the-gypsy moth is
Carbaryl better know by its
trade-name, Sevin. “This in
secticide is reasonably - priced
and is effective if appliations are
made at the proper stage of worm
development,” the specialist says.
The best time to apply Sevin is the
first few days after caterpillars
hatch.
'ln December of 1980 the U.S.
Environmental Protectum Agency
completed a thorough study Sevan
and its effects on human beings.
The study probably involved more
research reports than similar
studies on some medicines, since
Sevin has been around longer than
some of them, McDaniel says.
As a lesuu or this very detailed
scrutiny of Sevin, the EPA con
cluded that "the overall weight of
evidence does not raise prudent
concerns of unreasonable risk to
human beings.” It’s hard to con
sider the EPA as soft on pesticides.
Sevin was introduced over 20
years ago and is labeled for use on
more than 100 crops in the U.S.
This chemical is readily
biodegradeable. That is, it quickly
breaks down to become harmless
substances. It is widely used to
control pests on dogs, cats, and
other animals.
Sevin will kill honeybees if they
come in contact with it soon after
application. Beekeepers have
reported losing large numbers of
bees as a result of spraying fields
which were in bloom when
treated. Kills of other beneficial
insect species have also been found
under similar circumstances.
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Much of this adverse effect can be
eliminated by not spraying plants
while they are blooming.
“As is often the case,” says
McDaniel, “we have a product
which works well and presents no
unreasonable hazard to man when
used properly, but which has the
ability to harm local honeybees if
misused.” Pollination by bees is
essential to crop production in
many cases. People enjoy honey.
And beeswax is a unique and useful
product. So it behooves us to take
steps to protect this valuable insect
when treating for insect pests.
The simplest way to avoid injury
to bees is to spray when the trees
timmm
Ingenious Wogd/Coal Boilers
used as food' by gypsy moth
caterpillars are not in bloom. Most
species have finished flowering
before the gypsy month becomes a
problem and treatment is called
for.
Plans are now being made to
hold several meetings in New
Castle and Kent counties later this
winter in order to coordinate 1982
control efforts. These meetings,
which will be jointly sponsored by
the Cooperative Extension Service
and the Delaware Department of
Agriculture, will be used to
publicize the problem and to ad
vise on what basis control
decisions should be made.
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