Vol. 16—1962 - NorthEastern Weed Science Society

516
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and decthal. The best control ot crabgrass was obtained with zytron at the
2-inch cutting hei~ht. This test reemphasi,zes:bhe need for proper turf
management'.in. cr~b.8r~~_~~t~l, at!)· ~r, ,,~_thollt~:M'herbi cide. .
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Table 4. Effects ot 1'1owi~ Heights and Herpic:ide Treatments on nrabg,..~
ContrOl in a tuM' Nurse1"1 .'
Treatment
Untreated
Mowing
heiJ.h.t
~
1
2.
Zytron 1
151bs./A 2'
Dacthal
1l.a5nil./4 J,.
2·
Vis!1al estimates
Percqp.tage
area
covered bY
orab¢ass l
OI'abgrass counts
69 0 32.7 0
25, 64 12.4 62
4.3
0.2'
94
99.7
0.9
0.3
97
99
1.,..' »,
11 .- 84 r3lil&n :88
1,.9 97. ~Q" 97
.
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l~'
liS
,:"
L.S.,P.' .0$' (
"~,, _ \.. :. 0, J ,.J
-; -:,-",T'- - r,,-l'~ -:!-; -:-- - ~ -'-lrTi - 7'-~-- - ~:'-lr"r;'.-,-'!-·'- -.- -.'- -"~[',:'
l.Aver2ges over eleven turt grasses grown alone or in oombinat10n~ ';.,.,.;'
2Peroentage control based on compl'r;son with untreat"q. HJ.0ts at 1" cut1i~~ .
.height. . ,..... ' , .' ..::";.:.~:":"'::. .. .... .~,- ~(~.:.:._) : . " '. ';~':
3.Average~ ;of to~~~naom 'Cl.tt.,' ~aJilples'in~ao~,~ol~~v~ turf 3ras~s.imixtures.
. ,
Although the interaotion betw&en ohemicalssdtllllOWing height wasnpt
statistically signUicant becauSe 'Of smeUamoUiiWf"of,crabgrass in some' grass
bloCks",it appears that zytron '"elfless atteoted':b!fout'ting height than daothal.
;It the l-inch cutting height, control of crabgrass wasuna:'atfsfacrtory in SOII1ll
of the dacthal plots. It is clear 'that slow' ou't'fjUbjects these herbiCides to
a more severe test, than a hiiJh·Out. lI'urther wcii'ktfloUld reveal how oth.eJ'
materials are affected by mowingheight. ~r~ .
I '~, ".'.: '_ " _" , . , , .",' , _ .:~" -"! .t. -.' . _i:' -'. ': ,', ' :
Residual trtectspfherbic. j.@es:s.~,Q'l:,.abgrasJL,.' ~~,nd., ',Pl,"ots i,n NewHevep.i::,','
treated to!,th"pre-emergence e;r .~. es inApri-r:-~i we:re part:i.ally ,r~ated
on April 29, 1961. ''l'he only cihanges were sli]ht increases in the rates, ~ "
chlordane and "Pax" in 1961. The results are shown in Table 5.
A~ ~~" .o.,lson.
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lAhr.,en...s',. J., r..'.aP,d,.i
,~..JJt, ap.~1P..aria .01'll!l .J. , r}~ ~."'.',lI\IilrgenceHerbiCiQeS,for
Contro], of ~.~gras.s ~ Proc; ~1l.'j'IqQ :lli:~7.6-~.!9~(1pjp,). '" .""j r. "
1 • -~, ,. T,' • ~;-,r.' [;j r.""''"-~ (j ,;.. . . '::l; ,-.- r'.
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