Vol. 15—1961 - NorthEastern Weed Science Society

-298.
CONTROLOF SEEDLING GRASSES IN TURF
WITH DI~&NYLACETONITRILE, ,AND A SUBSTITUTEDDINITROANILINE
-', ' . ' ',' 1 1
E. F.Alder, fl-.L. Wright. and Q. F. Soper.:::t
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Introduction
Over the course of two seasonaa to,tal of .32 turf field tests
containing over 1,00 plots were conducted in order to evaluate two
herbicidal materials for their selective action against 'seedling
grasses in turf. The first of these materials is diphenylacetonitrile
which was coded aa L-l.3489 .ndilowhas the tentative
generic name diphenatrile. The second is N,N-di(n-propyl)-2,6.
dinitroaniline which was coded as L-.31864. No generic name has
as yet been coined for this material, and it will continue to be
ref$rredto here as L-.31864. ,
Procedure
,Fie.ld tests were placed in areas known to be heavily intested
with seedling weed grasses 'the preoeding year. In one test location
the turf was disturbed the preceding tall in order to leave
open areas for weed grass infestation the following spring. Smooth
crabgrass (Digitaria isohaemum) was the dominant weed grass in most
plots. Hairy crabgrass (D. sanguinalis), yellow and green foxtail
(Setaria lutescens and ~. viridis) and goosegrass (Eleusine indioa)
were present in several of the plots. In each test all treatments
were replicated tour times in a randomized block design. Turf
plots were four by six feet. Two-foot buffers were lett between
plots and four-foot bufters between replications. The seedling
grasses in four foot-square quadrats in each plot of the tour
replications were counted and averaged. In test areas of low weed
infestation, entire plot counts were made. The tinal oount was
taken 60-100 days atter treatment in the first of the test seasons,
and 120-140 days after treatment in the second test season.
Eli Lilly and Co., Agrioultural Research Center
Greenfield, Indiana