Vol. 15—1961 - NorthEastern Weed Science Society

29~.
7. Cacodylic acid (100%) .at 0.5 ~ound per acre.
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8. PI'~ 2,4-D (6.77% phenylinercuric acetate and 4.44% 2,4-Lichlorophenoxy
acetic acid) at 0.8 pou~d of actu~ ma~erial per acre •
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9. F W734 (25% emulsifiable concentrate of 3,4 dichloropropionanilide)
at 0.5 pound and 1 pound of ~ctual per acre.
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10. Void (3.15%disod1{m me'thyl usonate hexahydrate), at Sc()tts spreader
setting 8 (4.12 pounds of actual DYJAper acre).' .
The 2 pound rate of the SD 6~23 was tested with single and double applica ...
tions; the 4, 6, and 8 pound rates otthis material were applied only once. All
other materials were applied 3 times.
. The first applicat;i.on of ai::J,~terials:was,madeon JUne 29, 1960. The
n1aXimum air temperature on, that da!e. was' 87OF. at the 3-inch level. The pl()ts
receiv~ng a second. a~p::J,icatlon were treated on July 7, Jiith, a maximum temperature
.of' 86 of. at the 3-inch leveL··'ftle third. application lias made. on July ::J,9,
'with arna.Jd.mum3-inch temperatur, of 85°F. All three treatments were made on
clear, bright days, during periods of dry weather~ The total precipitation
from June thro~gh. SePtember was 14,9 illcbes (aQ9ut noX'D;la1)but August was a dry
Jrlonth~and Septem~r ,a wet one ,
The dry formulations, Clout and Void, were applied with a Scotts spreader
set at the manufacturer ~s suggestion. All other materials were ap-plied in water -­
with a low~pressure hand-pump sprayer at a rate of 270 gallons of water per acre.
. Di~coloration readill&E3.1feJ;'etakeQ. on July 5, July 11, and July· 22. Perman­
.ent injury ratiDgs and ane$t1Ill&t;e of control were taken on August 31. , The
final