Vol. 15—1961 - NorthEastern Weed Science Society

238.
Comparisons of Spray and Granular Applications of Certain Herbi­
. cides for Weed Control in Corn !!l ­
Frank B. Springer, Jr.lfO d
Richard H. Cole -
MUchhas been written in popular periodicals concerning
the virtues of gratwlar herbicides vs liquid herbicides for
use in controlling broadleaf weeds and grasses in corn. It
is agreed that several herbicides previously available only
in the liquid state or wettable powders are effective in controlling
both broad leaf weeds and grasses when applied in
either pre-emergence or post emergence applications but the
effectiveness of their counterparts in the granular form is
presently being evaluated.
Procedure
In 1960 three herbicides applied in solution were compared
with the granular formulation of the same herbicides
and then a comparison of these was made with an effective
herbicide and an untreated control plot.
Pre-e~rge~ce treatments of 2,4-D butyl ester solution a,d
, ,granular' (2,4~dichlorophenoxyacetic acid butyl ester), CDAA! 3/
(a·Chloro-N-N~diallylacetamide) solution and granular, CDAA-T_
(a-Chloro-N-N dlallylacetamide and trichlorobenzyl chloride)
solution and granular, and atrazine (2-chloro-4-ethylamino-6­
isopropylamino-S-triaz~n~)were evaluated at Newark and Georgetown,
Dela-wsre; at '~ates indicated in Table 1. The soil in
the experimental areas:was a Matapeake silt loam at Newark and
a NorfQlk sandY10am-atGeorgetown, Delaware. The plots consistedof
4'J:;ows,each18ft. long and spaced 3 ft. apart.
The hybrid was Goon.. ,870,· planted :May11, 1960, at Georgetown
and May 19, 1960, 'at Newark~ Herbi~ides were applied the day
following planting •. 'Amodified bicycle type experimental
. plot' sprayer was 'used for those chemicals applied in solution.
The low concentration of each herbicide applied in solution
was applied in 20 gal. of water per acre and the double con­
,centration was applied in 40 gal. of water per acre. The
double concentration was applied by spraying the designated
..._-_ .-­
1/ Assistant Agronomist and Assistant Professor, University of
2/
- Delaware.
CDAAapplied as Randox, courtesy of the Monsanto Chemical
Co., Organic Chemicals Division, St. Louls, Mo.
11 CDAA-Tapplied as Randox-T, courtesy of the Monsanto Chemi­
cal Co., Organic Chemicals Division, St. Louis, Mo.
'.i/ Misc. Paper No. 374, Del. Agr. Exp. sea,