Vol. 15—1961 - NorthEastern Weed Science Society

280.
PRE-RJIERGENCa:CRABGRABSCONTROLON TURFGRASS'
R. E. Engel, R. D. Ilnicki and R. N. Cook l
Good pre-emergence crabgra~s control has been given by
calcium arsenate, chlordane, dacthal, and zytron for one or
more seaaone at··New·Brunsw1ok, New Jersey. Promise w1th
these .cl;lemicalshas .eneouraged additions:! study at this
station and other locati.ons·1n the ·state. This report
.;gives 1960 results with these and tour addit:lonal herbicides.
Maximumlevel of performanceobta1ned and'best results for
three dit-ferent dates or spring application are given.
Materials
and Procedure
Calcium arsenate, chlordane, dactha1 (dimethyl 2,3,5,6­
tetrach1oroterephthalate), L-13489 (diphenylacetonitr1Ie),
L-31864 (N,N-di(n-propyl)-2,6-dinitroaniline), lead arsenate,
an arsenical complex (Pax), and zytron (O-(2,4-dichlorophenyl)
-O-methyl isopropylphosphoramidothioate) were used for preemergence
crabgrass control. Calcium arsenate (73%), lead
arsenate, and the arsenical complex were applied in their
standard form~ Zytron was applied w1th a vermiculite carrier.
Chlordane, dactha1, L-13489, and L-31864 were formulated
with granular clay.
With the exception of lead arsenate (hand applied),
treatments were 'made with a 3-foot lawn fertilizer spreader.
Plots were 3 x 20 feet and each treatment was in triplicate.
The test was conducted on lawn turf which was predominatly
Kentucky bluegrass. The turf area was overseeded with
crabgrass seed in the fall of 1959 and received a moderate
application of natural organic fertilizer. The stand of
crabgrass developed slowly because of insufficient rainfall
in late spr1ng. However, the turrgraE~es never experienced
severe heat or drought during the remainder of the season.
lprofessor 1n Turf Management, Assoc1ate Research Specialist
in weed Control and Research ASSistant, respectfully,
Department of Farm Crops, Rutgers--the State University
o£ New Jersey, New Brunswick, N. J.