Vol. 16—1962 - NorthEastern Weed Science Society

u
532
3) Those trea.t,mellts which weft, applied 3 time .. , gave little injury,;8nd
controlled signif1~ant1y were A""Un~12at 1 1b,). lb' + WA, 1 1/2 1b, Ans*, '
A-35 at 1 1/211)." ~,1/2 + WAand2.V2 lb. ' 'lc" . .
Two chemicals, Lofts Crabgrass Killer and Void, controlled significantly
but were under 90 percent.
The Niagara 6370 and Starn F-34 at 2 lb and 4 1b per acre gave very' little
contro1..t
.~': ~j
At the :tiJlleof final, crabgra .. counts, no inju:q' was apparent on the ballic
lawn grasses from any of the treatments.
SUmmaryand Conclusions
Because ol~ c~~tinued in:tertJt in crabgrasl\"clmtro1 in turf, the University
,of Rhpde, Island Agricultural ~xperiment Stati1mconducted pre-and
post-.merge~e crabgrass tria1sd!.irip9 1961 to eva1Lllte22 chemicals. The
chemicals were evaluated for effectW.ness in controUing crabgrass and for
sa fety to perenrUa,l. turfgrassehc ,•.rbf.rates of applieations and other specUics
were follQWed according to manuflcwrer,s I reconmendatd.ons or suggestions. ,·rr-hOse
chemicals which showed satisfactory:chemical controlGat one or more rates ate
as followsl
Pre-emergence
1) Trif1uralin
2) DaGtha19~1.~ apd Dacth1l1,W..50
3) Dipr()palin ., '
4) piphenatri1e and Diphenatrl1e
5) Zytron
+ DS~
6) A:VCF-108
7) ,Tricalcium,arsenate
Po~t-emergence
I'" ," .•
1) Ansar A-12.a~f\.n$ar A-3~',
2) ~alGiUQI ac1d methyl arson.te
3) Ammoniummethy1 arsonate
4) Disodium methyl arsonate
.:,
!.
I;::Yf
+
" 5