Pa. Braces For Tree Pest Onslaught
WARREN (Warren Co.) was nearly four times greater than street » causing a s hot-hole effeoAs they
They hatch during mid- to late thatof its better-known cousin, the adult of elm spanwonn mature, they eat all leaf material
May. them begin to devour die gypsy "J oth - is a powdery white moth with a between the major veins,
leaves of hardwood trees. In 1993, Unlike the gypsy moth, the wingspan of one to one-and-a-half Hoover said property owners
they defoliated Pennsylvania elm spanwotm is a native spe- inches . In m i d -summer. the can take steps to protect their
landscapes and forests to the tune c jes, said Greg Hoover, exten- females lay an average of 250 frees. “You should monitor your
°f more thanl.2 million acres. tatC S oblong eggs in compact masses on landscape from mid-May through
If the pest that comes to mind is C°»ege of Agricultural Science, the underside of twigs or branches early June for signs of elm span
the gypsy modi caterpillar, think .It has been epidemic pcruxhcally or on tree trunks. The eggs are w °rm larvae.” he said. "Where
again. The elm spanwonn has m Pennsylvania since 1931, but bright yellow.,™ whe n first Possible, prune small twigs that
become the blest major threat to «J*y for more than one year at a m but dull u are infested with egg masses and
the state si woodlands. The notice- frme. In the past, it was best or bn)wn in win destroy the eggs by burning or
able defoliation it caused in 1993 known as a major pest of urban After they hatch in the Spring, buiying them. 8
_ /''v the destructive larvae grow to “If necessary, a registered
apring L/D6II about two inches long and mimic insecticide can be applied when
1 ° » twigs. Most are dull or slate black l arv ae are small. Homeowners
TTai-pa QL n A ‘ with a rust-colored head. Some of may want to contact a professional
riOrSC iJIIOW |3o¥ the larvae may be light green with arborist to apply an insecticide,
yellow heads. especially on large trees.”
DALLAS (Luzerne Co.) —The On Sunday, the show begins at fecdona large varie . The current elm spanworm out-
Ninth Annual Spring Classic 8 a.m. with English classes for all ty of haidwoods and shade trees break began in 1991. when the
Open Horse Show will be held on ages. A wide variety of hunter although they prefer elm hickory’ P est defoliated 65,000 acres.
May 7-8 at the Luzerne County classes, including pleasure and oak, red and sugar maple Ameri- mostl y Elk and McKean coun-
Fairgrounds on Route 118 in over fence classes, will be held. and j,,’ ties. In 1992, it spread to Potter
, 1U . e • I s^a^ C l P !. C^ urcCla i S ’ feeding on’the underside of leaves. County and defoUation increased
The show will begin on Satur- ic will be held both days and a to more than 300,000 acres,
day at 8 a.m., featuring a variety Super Horse Award will be given
of western classes. Events include at the end of each day to the horse
western pleasure, reining, trail and accumulating the most points
gymkhana for all ages. throughout the day.
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By 1993, the outbreak extended
across the northern third of Pen
nsylvania from Sullivan and Brad
ford counties in the east to Warren
and Forest counties in the west.
The damage reached as far south
as Somerset County. Defoliation
was visible from the air in 15
counties.
Entomologists are looking to
the elm spanworm’s natural ene
mies to help control the pest
“There are two tiny parasitic
wasps that are known to suppress
the elm spanworm in the egg
state,” said Hoover. “If the para
site population increases enough,
these small beneficial insects can
destroy 80 percent or more of the
elm spanworm and cause a collap
se of the outbreak.
“But until the parasite popula
tion catches up with the pest, it
looks as though damage from the
elm spanworm may be severe in
1994.”
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