Vol. 15—1961 - NorthEastern Weed Science Society

275.
Table 5. Effect. of preemergence materials on crabgrass
control expressed as average plants survival per square
foot and percent reduction b~sed on control plots.
Treatments applied ¥~ 5, 1960; data recorded October 10,
1960. .
liateria1
Dac G-l~.
Rate
10 a.i.I.A
20 a.i./A
Crabgrass (Diro*taria slt0)
. -;--
Aveo Plants/Sqt,Ft.* %Reduction
0
100
0
100
H
Dac 1150
10 a.i.I.A
20 a.i./A
0.1
0
99.5
100
rae {Rid) 10~~
20ft!
Chlordane G-IO 60 a.i.I.A
120 a.i./A ..
0.6
0.4
4.0
0.2
97
98
.
ao
99
Chlordane
(Ortho)
72 EC
60 a.i.//!
120 a.i./A
Chlordane (Halts) 6f!i
12ft;
Zytron 1'1-1329
/
13 a.J..I.A
26 a.i./A
Zytron ·1.i.1662 13a.i.I. A .
26 a.i ../A
Ca. Arsenate G-73
.
l~l!i
30/E
9.7
2.2
6.7
3.8
1.4
0.2
0.5
0.1
0.6
0.4
Control
-
20.0
-
.,
51.5
89
66.5
81.
93
99
97.5
99.5
97
98
* Ave. 10 Sq.Ft. quadrate counts per plots, 3 replications
;:.* ;t reduotion based on 6 control plots