)o—Lancaster Farming, Saturday, March 15,1980
Bean beetle outlook tough
NTSWARK, Del. - Start
inning now for Mexican
in beetle control in your
'beans. You’re going to
'■d it.
Overwintering populations
this pest are the highest
iy’ve been in five years,
ports University of
laware extension pest
inagement specialist
ark Graustem. Growers
no don’t take proper
elective action could well
e early, heavy feeding on
air seedling soybeans.
A survey of overwintering
exican bean beetle
pulations in Delaware
iicates pressure will be
eatest from south of the
nal down through Milford
■d Greenwood, with one
olated hot spot down
ound Angola.
In view of this forecast,
raustein advises growers
prepare themselves now
r some form of MBB
ntrol.
They have three alter
tives; plant a snap bean
ip crop; monitor fields
utmely and spray for MBB
ten economic levels of
estation are reached; or
ake an at-plantmg ap
cation of a systemic m
rticide.
I’he pest management
aciahst considers use of a
stemic the least
itisfactory of these
ternatives for several
asons. For one thing,
stemics only last for about
i weeks
This means that though
ey’ll give you early
nlrol (which will be
itical this year), once
ey’ve worn off, your crop
vulnerable to a new in
station With the heavy
assure forecast, you may
ell need to spray later on if
ju go this route.
Another disadvantage to
ystemics for MBB control is
nat though they will control
mps and leaf hoppers as
none of the materials
abeled for this use will
ontrol green clover worm,
rasshoppers, Japanese
■ettles and other defoliators
r pod-feeding worms.
Currently there are three
ystemic insecticides
abeled for MBB control on
oybeans: Thimet, Disyston,
md Temik. Besides early
’ean beetle control, Temic
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will also provide some
nematode and some early
mite suppression, but this
suppression is only tem
porary.
There’s also some
evidence that certain
systemics can aggravate a
mite problem in soybeans
during dry weather, though
entomologists don’t yet
understand why.
Your other two choices for
MBB control in soybeans are
to use a trap crop or to
routinely monitor fields and
spray when beetle
populations reach the
economic level.
The pest management
specialist strongly recom
mends using a snap bean
trap crop because when
handled properly this is by
far the cheapest and most
effective way to achieve
MBB control over the entire
growing season. This
method should only be used
in fields with a history of
MBB pressure or m areas
where the overwintering
population is high as in
dicated by beetle activity
last fall.
The trop crop method
takes advantage of the fact
that the MBB, when given a
choice, prefers to feed on
snap beans rather than
soybeans
The system involves
planting six to eight rows of
snap beans along two edges
of each field at least a week
before soybeans are seeded
so that when overwintering
adult beetles emerge from
the woods and brush bor
dering fields, they’ll be
attracted to the snap bean
foliage As long as there’s
any of this to feed on, they
won’t move into the adjacent
soybeans
Concentrated thus in a
small area rather than
spread out over an entire
field, the beetles are much
easier and cheaper to con
trol.
There are four different
ways to deal with the MBB in
your trap crop. You can
treat it with a systemic at
planting. You can treat it
with a foliar insecticide
when the first MBB larvae
hatch out. You can disk the
trap crop under after MBB
larvae hatch out and
overwintering adults have
started to die off around the
PH 717-299-2571
first week in July. Or you
can use a parasitic insect,
Pediobius, which kills MBB
by laying its eggs in beetle
larvae.
Graustem prefers this last
control in the trap cr
because it’s a biological
method which requires no
chemicals and no extra
energy investment on the
part of the grower.
It also has the advantage
of long-term control Once
the trap crop has been
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defoliated or has matured
and died off, Pediobius will
continue to follow the beetle
and parasitize it as it moves
into the soybeans. And by
this time the crop should be
far enough along to tolerate
some defoliation without
affecting yields.
With the parasite you don’t
run the risk of having late
season economic damage
from MBB something
which sometimes happens
with other systems when
there is heavy pressure from
this pest,
How can Graustem be so
sure the parasite will do its
job? “We’ve been demon
strating its effectiveness
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Goodyear Tires Distributed by P. Übzeiler A Sen Ce., Lancaster
since 1975 in trap crops
around the state,” he ex
plains. The only time it
hasn’t worked is when the
trap crop isn’t managed as
prescribed.
What kind of savings can
you realize with a trap crop’
A one-acre trap crop ef
fective for control of MBB in
a 50-acre soybean field will
cost less than $l5O. This
compares with $5OO or more,
$lO-$l2 an acre, to spray the
entire field, or $4BO, $B-$9 an
acre, to apply a systemic on
the soybean field at planting.
Growers interested m
learning more about trap
cropping can find out how
it’s done from Delaware
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extension bulletin No. E 33.
This is available at county
extension offices in Newark,
Dover and Georgetown.
Graustem is also
preparing a one-page leaflet
which outlines the steps for
planting a trap crop.
If you would like to use
parasites in combination
with a trap crop MBB
control in your soybeans
next summer, let your
country agent know exactly
how many trap crops you
intend to have That way
enough parasites can be
raised now for later release.
Get your order in as soon as
possible—but certainly
before April 15
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