Vol. 16—1962 - NorthEastern Weed Science Society

530
Prior to each chemical application the area was watered to assure sufficient
moisture for growth and~~ q~plywith the4'~ections for the application
of the dry materials. . ,
The first chemi~al appl1cat1gns were made on~JulY 18 at which time the
crabgralls>s:>lant¢.,we:qein the 2-3l;d stage. The~'Ywas clear and the ail-temperature
was 85OF. The second ~p~lication was m~!July 28. The air ttlllperature
at time of application was 82Of. The third application of chemicals was
made on AU9J.I~t 10. The air ttJllP8J:8ture on this dill was 85Op.
Table II shows that some chemicals
)
were applied only once while others
we~e,applie(t:twoor three times. Certain chemical."or rates of various chemical
s , causeif serious injury to the turf afterth,()fiI.~st application. 1llese
treatment~ were not ,repeatecl. Candn other trea1lllents controlled crabgrass
satisfactcirilywith'two applications so these chemic;a}.swere not applied a
third j:lm,. The third applicatioQ}V8s made only wtw.nit appeared necessary for
safe a~ a~equa~e control. :
,Throughout the, ,growing seasol1 soil moisture .' ,not limiting for any prolonged
period of time even thou~,.~etest area r~ived no irrigation except
on :t;reatment dates.
i"·:'
F01,!ril')jury ratings on the' ba;sic grasses were.:,Jl;a~en during the season with
the final ones, plus plant counts, on September, 19.;
An analysis of variance was run on these plan\counts and the percent
control over the checks was calcVl~ted.
Tl1elJlat~ri~lsincluded, the ,rates used and ttMt;companies supplying the
chemicals are as follows: .'
, , " :"
, 1) Niagara 6376 (exper"ime\'ltal) at 6 lb. Ni*ra Chemical Division, Food
> Machinery and ,Chemical Corporation.;i
, 2) StainP;"34 (3,4-dichloroprepionanilide) a~~,and 4 lb. ChipmanChemical
Company,' Inc. ' >' ' , , ' 'Jl
,3) Ansar A:"l2. (organic arseJ'lcill, As 44.3% ,byiVIt.) at 1 ~ 1 + Wetting
Agent, 1 1/2, 2, 2 + WAand 4 lb. Ansul Chemical~pany.
, 4) ,Ansar A~~(organic 8rs.n19a1, As 24.~,l;2yr:Wt.)at 1 1/2, 1 1/2: + WA,
21/2, 3 1/2, 3 112 + WA, and ,5,lb. Ansul Chemical! C:QJlItlany. "
5)'Super,C;rab-E-Rad (Ca191U1l!acid methyl ara~1;e) at 21.5 lb. Vineland
Chemical CO!IIpimy., ":! ,,': r
6) Methar 80 (Dis odium methyl arsonate H,xah~rate) 7.2 lb •. W. A. C.leary
Corporation.
'
7) Super Methar (Ammoniummethyl arsonate) 16.1 lb. W. A. Cleary
Corporation •
. ' ,8). Lofts C 7abgrass KilleJ:, (Pi~odiun methYl ,,~oRate Hexahydrate) at ,
2.85 lb. ,Pe