Vol. 16—1962 - NorthEastern Weed Science Society

Table 1. Effeo~ of.Season of ~p~;cation on Crabir!'. Control and Turf ~Pdury
Herbioide
Calcium
arsenate
Rate
aoi.
Ibs./A
'310
740
Chlordane 70
140
Dacthal 7.5
15
"Pax" (8%N) 880
1760
Zytron 15
30
513
Peroentage Percentage
Time of,'):' contri)l of thinni
ApplicathD Crabil;'~~ of tur~
Sept. C::, July 13 Sept. i4
\,~ : ~'Ii' ;.[.
, Oct.-_.... 8503"-- 0 '0-
April 90.7; 0 0
Oct. 98.0 0 0
April 99.3 ' r~ 8 e
Oct. 85.7 ;,) 0 0
April 87.7 0 0
Oct. 89.0'i', 4 0
April 95.3 2 ,0,
,.)
Oct. 86.7 0 0
April 96.0 '~: 5 0-
Oct. 97.3 2 0
April 98.3 )0 5
,;~ ',rLl
Oct. 31.7 0 0
April 46.0 0 0
Oct. 64.3 ' 5 "0'
April 86.0 .'. 2 0
Oct. 87.7 , . ,
0 'G
April 92.3 0 0
Oct. 93.0 0 0
April 96.0 12 ,(),
\;;
L.S.D. .05 9.6 _.,
.01 12.8 'I
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lAverage ratings of two personSio~r three replicates.
At the lower rates of app~cation, zytron, di~penatrile, and chlordane
provided 90 per cent or bet,ter' ~ohtrol of crabgra$~"; whereas calcium pro~yl
arsonate and calcium arsenate proVided about 85 pel; cent control of cra1;lirasl'
(,Table 2) •.. "Pax" at 880 Ibso/A,,anCl,'. dacthal at 7S,;,;LbS./Adid not cont~J,..crabgrass
satisfactorily. These rates of "Pax" and d~P.thal apparently are taolow
for consistent. oontrol of crab~~a~~.·' .
In general, cr~bgrass,contro1.,with zytron, dag;thal, and "Pax" in 196;1.was
similar to that obtained in 19~~. Calcium arsenat$was less effective ~n 1961
than in 1960 and chlordane at 101bs./A in 1961.we, somewhatmore effeotiye
than at 60 Ibs./A in 19600"
In addition to crabgrass, zytron also appeared to control Oxallls spp~
in this test, and both calcium arsenate and "Pax" appeared to control sheep
sorrel (Rumexacetosella).