Vol. 16—1962 - NorthEastern Weed Science Society

weeding of Lima Bean. With Chemical Herbicides
Char1el J. No1l 1
The weeding of lima beans is tBportant in reduoing the cost of production
of this crop. DRBPhas been commoolyu.ed but the .earch continues for a >
better and le .. expensive chemical. The expertBent :reported in thi. paper>18
a continuation of work started a-few years ago.
PROCEDURE
The seedbed was prepared and pre-planting treatmente made June 1. Tha.e
treatments were t.corporated in the .oi1 with a roto~i11er .et .ha11ow. The
following day the lima bean varlety rordhook 242 wal leeded. The pre-emel'lence
treaenent. were applied from 1 to 6 days after planting. Post-emergence treatments
were made 10 day. after planting. Individual plot. were 27 feet long
and 3 feet wide. Treatments were randomized in each of 6 blocks.
The chemicals were applied with a small sprayer over the row for a width
of 12 inches. Cultivation controlled the weed. between the rows. An e&timate
of weed control was made Auguat 24 on a baais of 1 to 10, 1 being moat>.
desirable and 10 being leaat desirable. Bean harvest wes completed September 29.
RESULTS
The result. are pre.ented in table 1. All chemical •• ignificantly increaaed
weed control a8 compared to .the untreated check. There were aignif~
caat differencea in wee' control between the treated plota but the higher >
rate of treatment of most chemicals gave sufficient weed control. The 8t~nd
of plants waa unaffected by the treatments. All treatment. except U-4513
at the 1.'8er rate re.ulted in significant increa.e in weight of beans.
CONCLUSION
Taking into consideration weed control, 8tand of plant8 and yield no
chemical treatment was superior to DNBPapplied post-emergence. Many
chemicals did a good job of weeding lima beans without injury to the
stand aad with increase in yield _ compared to the UQtreat.ed·aback
plot. Someof the mo.t promi8ing of the8e are Atramatryne, Trietazine,
Herb. 326 and Hercules 7531.
89
1 A.eociate Profe,80r of 01erlcu1ture, Department of Horticulture, College of
Agriculture.and Experiment Station,Penn8y1vania State Univer8ity, Univer.ity
Park, Penn8y1vania.