Vol. 15—1961 - NorthEastern Weed Science Society

120.
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Chemical Weed Control
Charles
in Snap and Lima Beans
J. Nolll
Earlier work at a number of institutions including Penn State
University suggested that lima beans and snap beans respond different4r
to the same herbicides. To further study this difference and to
investigate newer chemicals for the weeding of these crops the
following experiment was conducted •
.Procedure
The lima bean variety.Fordhook 242 and the snap bean variety
Improved Tendergreen were seeded June 7. Each plot consisted of a
single run of 25,feet of l~ beans and 11 feet of snap beans planted
S feet apart. .fre-planting treatments were applied the day before
seeding and incorporated in the soil. All other treatments were
applied either the day following planting or 2 days after planting.
Treatments were randomized in each of 6 blocks.
The pre-planting treatments and the granular herbicides were
applied over the rqw for a width of 2 feet. All other applications
­
were sprayed over the row for a width of 1 foot. Cultivation
controlled the weeds between the rows. An estimate of weed control
was made August lQon a basis of 1 to 10, 1 being most desirable and 10
being least desirable. Snap bean harvest was completed August 8 and
lima beans harvested September 28.
R.esults
The results are presented in tables I and II. All chemicals gave
high4r significant increases in weed control as compared to the
untreated check. Many chemicals gaVe near perfect weed control at all
rates. These include the two pre-planting treatments EPl'C and R-2061
and the pre-emergence treatments !miben, Propazine, Atratone,
Trietazine and Alanap S. other treatments that gave excellent weed'
control were Fenac at 1 1/2 lb. per acre, Zytron at 18 1bs. per acre,
Niagara 5996 at 6 Lbs , per acre and DNBPat 6 Lbs , per acre in a
Fre-emergence treatment.
1 Associate Professor of Olericu1ture, Dept. of Horticulture, College
of Agriculture and Experiment Station, The Pennsylvania State
University, University Park, Pa,