Vol. 15—1961 - NorthEastern Weed Science Society

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295.
Results
The procedure of seeding crabgrass over a 11&ht topdressing resulted
in a uniform population of crabgrass and a high degree of agreement alllOng
replications.
The treatments were rated on Jul;y 25 by One person. as follows:
· " .
TU@IfBN'l NO.CHlMICALRATIRi
IWWUSS
1 Chlordane Poor
2 Ca JXlenatePoor
3 ' paz POor . Least etmtrol of aU chemical.
4 Dacthal Bxc,el.leftt
S Zy-tron Excellent, Sif.ptly better tban No.4
6, Check 11Cl'Ae
7 DSHA(Gr... ) Poor
. 8 AHA'. (Ue. \ 'air; . Deflnite1n furv to fescue •
••••••••••••••••••••• • '~.('.'.""".' ••• ".' t •••• f,_ ••• ., •• ~ ••••••••••••••••••••••
Three people aade independent ratin8s
in mid-September:
:- , . ", . "1;.... -., ,"
•. ~. ~ ,. ~ ,* •• ~ l' i~ '~" ~ _ !'. ~~ •.•• ,' .... _.~ ,. ,*,' ,•••• r* •••••• • • , • ~~ ••• • ••••••••
TUATMDT·. ..... Est! tpCENtC9ftROL . .'. RATINGS
NUMBER CHEMICAL' ABC .A' I C
1 Chlordane ,. 31 . '46. .38 Poor+ Poor Poor
2 Ca Arsenate .32 60 4S POor Poor+ Poor.
3 P. 324.2'. 31 Poor Poor .Very Poor+
4 Dactbal 94 94 ~7 ExceU.ellt GooGt. Good+
5 ZytroD.. 95' 96.. 99 . .' Excel1~nt Excellent Excellent
6 Check' 0 0 0.' .Nona Bone None
1 DSHA(Gx-aa.) , 2646 34, Poor Poor Poor
8 .AHA (Uq.) 44' .48 S1.poor+ . Poor+ Poor
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The followiq observations wre noted at the n': 1meof t~ September rating:
Chlordane, Ca Arsenate, Pax - No indication of injury.
Zytron ....No indictJt lOll of· injury.; grass had .cellent appearallce.
Dacthal - General appearance ~t quite.as g~Gd as Zytron •.
D$MAand A.llCA-loth post"'!'emergence t~eatments,injured fescues. although
considerable recover:rbad takenplace.by tlle middle of
. Septe"ber.
Conclusions
tJader theconditi0n8 of· this •experiment. zytron and dacthal gave
silt is fac tory control of crabgrass in'atiluesrass ...feecue turf. Chlordane
and the two arsenic products did not live satisfactory control.
Both granular and liquid fOlWSof the methyl arsenates. used posteme~DCe.
injured fescues noticeably. Netther form lave satisfactory
control. Lowsoil moisture at certain tt.e. of application probably
contributed to the turf injury.
This experiment was supported by the Massachusetts Turf and LawnGrass
Association.