Vol. 15—1961 - NorthEastern Weed Science Society

PRE-EMERGENCEWEEDCONTROLTN ceRN
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,i'he,1960 pre-~mergl1ln~~, :weed control treat mant s were 13imi la r
to tile plots es tab:lt s:h~d,ln the, lat e .f art 1 es and early ft f t i as
b e ca use of the int,erest in granular 2, 4-D.
i'he first 2i 4-D pre-emergence weed control in corn in the
United states was done by J.C. Anderson and D.E. Yolf in New
Jersey in 1946. ~he 2, 4-D was applied just before emergence.
From 1947 to 195" many investigators in the northeast applied
2, 4-D at planting time and also just before emergence of the
corn. Since 19',. very little work has been done with 2, 4-D
at planting time because of the chances of more injury to the
corn.
The corn, in 1960 wasp'lanted with a four row planter. The
center two rQ~S w~re treated and the edge rows left as checks.
fhe results given fn Table I were obtained by counting weeds in
the treated rows and adjacen. untreated rows to obtain the per
cent control. There was a goad s'tend of broadleaf weeds in all
areas, but grass population was scattered.
The tr~atments marked:e~riy were~pplied the day of
planting. All other treatments were applied just before Pcoma
up" of the corn ..
Granular 2, 4-D and liquid 2. 4-D reacted in a very similar
manner.. The corn in these plots was slightly stunted when
the plants were 4-, inches't"al1, later in the season you could
see n o' injury. r r you 'did not have nontreated rows next to the
treated area, you could not see the stunting.
Atrazine and sim~zine were outstanding in controlling both
broadleaf and: grassy weeds~ Granular s1mazine was somewhat
poorer than simaz1ne 80W.
1. pr(}f~ssor at AgrCJn"my. Penn str:ite TJnivers1ty.