Vol. 15—1961 - NorthEastern Weed Science Society

294.
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A TEST or CHEMICALSroa C~lWS CONrllOLIN TURri '
John a. Hav1l 2
. .
'The area chosen for this test hael been seeded to a fairway.mtxture
about fifteeD ye~• .,re.iou.aly. It had' receiVe .. ~it~le :0'1' Do fertilizer,
and va mOwedwith ••• ickle· bar th1:ee or fourtu.s a year. ,The grasse.
were a mixture of bluegra.s and fescues. Miscellaneous weeds ,were present
but very little natural crabgra8s.
During the last two weeks of April, 1960, the graSI in the are. to be
u8ed was mowed to 1 11.2 iaches in height, fertilized witb 15 pounds of,
10..6-4, and aU .. ht top.clr:e8s~ng of 80U ~as' ~p,lied. the uea was then
seeded with 4 pounds ofweeel eeeell bavi:q a biah perce.taae of crabgrasl.
The area, 20 by 80 feet, was divided into 32 plots 5 by 10 feet in dze.
Thts provided plots for 8 tre.bIents, including a check plot, repU.cated
fOUr tl... ' .'. .' , .
;, t . ~ , '.
Five pre-emeraence herbicides were appUed May S at rate. accordiq
to labeldir~c~io~ 8s;fol1owe:
Granular 231 :chloidal18 at 6 lb. Per 1,000sqUare feet
Pelleted 73~ tricalciU1ll arsenate at 12 lb. per 1,000 .quare feet·
Pax-combination of arsenicals + _. sulfate at 20 Ib~ 'per 1,000 8q. ft.
Granular 2.3%. dactbal at 10 lb. per 1,000 square feet :
Granu1ftr, 8'&zytron at 6 lb. per 1,000 square feet ,.
These app1icati~8 were made leIS than three week. before the' first
'crabgrass seedlings could be identified on Hay 23.
., Two.treatments of post-emergeace herbicidel were included :tn the':: ,
:experf.Mn:te: ','
Granular 3'&JJSMAat3 lb. per 1,000 equat'e feet wal
appli.ed five tiMs • June 21, Ju11 S, July 8, July 12, aDd JUly 28.
Liquid 16'&AHAat IS oz. per 1,000 square f.et wa.
applied two time. - JuDe 20 and July' 28 • '
• L,
Irripticmwa. oot availa~1e fot ~bf.8' exp~rfJlllln( • Appt'oximately two
'inches of rairafell. in ·die week of Mal • to~'t5. whiGh va. between the time
of 'the pre';;eMr8enc. appliculoaa and "'r8eace 'of crebp'asi~ The rainfall
.pattern for the reMinder of tbe 8eaeon WAI ravorable for satisfactory growth
'ot'turf, except fOl\.tbe period JUae is to, '0~nt" soil became' quite
dry. A second application of fertilizer'~•• ".. de at the end of June.
Tbe test area wa.~4 weekly. ',' .
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