C2B—Lancaster Farming, Saturday, April 18,1981
COLLEGE PARK, Md - Let
tuce growers can increase profits
with a new method of fungicide
application which uses less pes
ticide and, at the same time,
improves yields
Profits for lettuce growers
usually can be increased by $3OO to
$4OO per acre, Peter B Adams said
Friday at a meeting of the Poto
mac Division oi the American
Phytopathology Society.
His research shows that lower
ing the amount of a commercial
formulation of metham (32.7 per
cent active ingredient) from 75-100
gallons per acre (as recommended
by the manufacturer) to 25 gallons
of the product per acre, reduced
losses due to lettuce drop to two
percent. This contrasts favorably
with 19 percent losses in untreated
fields, reported Adams, working at
USDA’s Science and Education
Administration.
The higher amount of metham
application is very costly for use
on large areas. And Adams, in co
operation with J. Kirkun, a visiting
scientist from Israel, found that
the lower concentrations of
metham (sodium methyldithio-
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How to boost lettuce profits
carbamate) were even more eff
ective in destroying the fungus that
causes lettuce drop, Sclerotima
minor.
The tests were first done in lab
oratories at the Beltsville Agri
cultural Research Center. Then
field tests were performed in New
Jersey, with the assistance of S
A Johnson and J F. Carpenter of
Rutgers Research and Develop
ment Center. In this second phase,
Adams and colleagues demon
strated that by mixing metham
with irrigation water and satur
ating the fields, less fungicide was
needed to improve yields.
“Lettuce drop can be a problem
wherever lettuce is grown in the
United States,” said Adams. The
fungus Sclerotima minor attacks
and blocks the stem at ground
level, preventing water and nutri
ents from reaching the lettuce
leaves They wilt and the plant
literally drops to the ground
Since the fungus thrives on let
tuce, plowing disease plants into
the field can increase the number
of disease-producing organisms
in the soil. Therefore, lettuce
growers minimize losses by plant
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vnr»v v„ i r> *. , , competition must meet
YORK - York County’s dairy followinsreauirements
industry is seeking the young lady '
who will be crowned their first lady . th . . f y ’ f .
of milk promotion, the 1981 York fa^er to g fSn manS
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Prmcess crown will take pJrt'm d “™ g ‘ h f e current th year ’ or the
. . .Vj . owner of more than one dairy
SLS?’£wSK anunal pmr to May 1.1981;
Hall. The winner will represent -have completed her junior year
York County at the state pageant °1 school, but not reached her
in Harrisburg on September 21 and 22m* birthday by December 31,
22. 1981 ;
Fnl'vnt- ... the Y ■'’ounty -must be single and never
/ !
V
...
ri i
i.
“MHL"
mg lettuce in the same field only
once every three to five years
Growers also fumigate lettuce
fields two weeks before planting
to kill any fungus that remains
in the soil. A gaseous fungicide
like DD mixture (a mixture of
chlorinated three-carbon hydro
carbons) is “shanked-m”-pumped
into the soil through an eight-inch
spike or shank that is dragged
through the field.
The new method of fungicide
i y A < ms
York County seeks princess contestants
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is efficient and low m
cost, but it requires a good water
supply. Any type of conventional
sprinkler irrigation system can be
used to apply the fungicide, said
Adams.
“Simply mix metham into the ir
rigation water and saturate the soil
until it is wet to a depth of eight
inches. This usually takes about
four hours, ” he said.
Because it is simple, the new
method will undoubtedly be used in
greenhouses to apply metham to
produce disease-free seedlings,
Adams noted.
Research plans for metham
ipplication by irrigation include
studies of its effectiveness in con
trolling other plant diseases such
as Verticilhum wilt of potatoes,
damping-off fungi, and white rot
of onions, as well as controlling
other pests, like weeds and nema
todes.
married; cannot marry during her
reign;
the
-must have her parent’s or
guardian’s consent;
-must attend the training
seminar July 13 to 15,1981;
-former local winners are not
eligible;
-must give a one to three minute
presentation or radio spot at the
pageant.
Entry forms are due May 1, and
can be obtained from June Boyer,
110 Biesecker Road, York, or by
calling 717/225-5240.
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