Vol. 15—1961 - NorthEastern Weed Science Society

242.
THE EFFECTSOF SEVERAL CARR!ERSdF'2,4-D AND ITS
.FORMuLATIONSON WEEDCONTROLAND ON THE RESPONSE OF CORN
Richard D. Ilnicki l and C'. Fred· Everett 2
. ABSTRACT
The use of 2,4-dichlorophenoxyacetic acid: (2,4-D)' for the
control of weeds in corn has become an accepted practice. Corn
is classified as being moderately resistant to injury from this
herbicide. Generally, post-emergence applications of 2,4-D are
sate; however, pre-emergence applications on light soils, followed
by excessive rains may cause severe injury. Since the advent
of the granular carrier considerable interest has been given
to granular preparations of herbicides in order to increase herbicidal
activity and/or to reduce crop injury.
The objectives of this study were to measure herbicidal
activity and the response of corn to several formulations, carriers,
and concentrations of 2,4-D. The following comparisons
were made: liqUid vs. granular preparations of both esters and
a~1ne8; a 10% vs.-a-20% ester granule; and slow vs. fast disintegrating
granules of the parent acid. Rates of-rand 4 pounds
per acre of the acid equivalent were applied the day after planting.
The follOWing observations were made: in general, granular
preparations, both of the esters and amines, produced slightly
better weed control but effected greater injury to corn than the
liqUid preparations; the 10% granular ester preparation gave
better weed control with slightly more injury to corn than the
20% granular ester; better weed control with less corn injury
was obtained with the liqUid ester than with the 20% granular
ester preparation; and" the slow disintegrating granule was
superior to the fast disintegrating granule, however" yield
reductions were less with the latter.
lAssociate Research Specialist in Weed ContrOl, New Jersey
Agricultural Experiment Station, Department of Farm Crops,
Rutgers--the State University, New Brunswick" New Jersey.
2aesearch Assistant" Department of Farm Crops, Rutgers.