NEWARK, Del. Soybean
farmers should scout their fields
regularly now for signs of insect
opts. During warm weather,
(filiations can increase rapidly.
University of Delaware Ex
tension pest management
specialist Mark
Graustein says frequent walks
through fields can help catch
problems early when controls are
most effective.
“If extremely warm conditions
persist, we expect spider mite
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Scout soybean fields regularly for insects
problems to increase,’* he says.
Early mite infestations generally
begin around field margins.
Symptoms -are yellowing or
bronzing of leaves.
When these symptoms are found, fields, scout at least 10 locations
farmers should check their fields and estimate the number of larvae
immediately for spider mites, and adults per 3-row-feet at each
Quick action is essential. If mites " location. Need for treatment is
are detected early and if they’re determined by insect counts and
limited to field margins, only those plant maturity. Control is
infested parts of the field should recommended under the following
need treatment, the specialist Plant maturities and average
says. If control is called for, he beetle counts per 3 feet: seedling
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recommends either Trithion or
Cygon4oo.
Mexican bean beetle populations
are currently low to moderate m
most parts of the state. To check
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state - 3 or more (adults); pre
bloom - 20 or more (adults & lar
vae) ; bloom -16 or more (adults &
larvae); pod set - 16 or more
(adults & larvae).
If control is needed and
beneficial parasite "mummies”
are not present, Graustein
recommends treatment with one of
these materials: Sevin, Cythion,
Larmate, Nudrm, Trithion, Perm
cap M, Cygon 400 or Orthene.
Other insects which may now be
present in some fields are
.»
Lancaster Farming, Saturday, August 7,1982—A17
Japanese beetles, green clover
worms, silver-spotted skippers,
grasshoppers and leafrollers. If
any of these appear to be causing
serious damage, farmers are
urged to call their county extension
office.
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