Vol. 16—1962 - NorthEastern Weed Science Society

w.l.th 3 and 4 Ibs. ot Randox per acre respectively, wb-1J.e 85 to 95%control
was obtained at Far:m.S. Increasecl yields otpotatoe. were obtained with
contrOl'dt ba~d grass and some :1alDQsquarlercontro-l at location 8,
Table?
179
Table :I.- Eftect or Granular Fonn~tlons ot COM, and. Daiapon Applied at
. ~ on Control ot Hig.h Popu.la.t1on of Crabsre.ss and on Yield or
Katahdin Potatoes - F&1lIlG - Connecticut 1961
.CrabFaelS Control
Active Rate ...L21Ch~
Yield 1/
%of Chegk
CDAA 20G
(Randox)
it lbe/A sAO =722
3
4
95
100
85
95
121
125
Dalapon lOG 4 (All 70 ?/
5 wilted) 95 l24
, t
1/ Yield, on s:1ng~ plots 2 rows x 50 feet, in percent ot adjoining check.
2/ Adjoining checkcl&Iaged by spray tracks. .
~ 2! DalapotH In a field with a heavy popuJation or crabgrass the use
or Dalapon at 5 lbs."per acre resulted in nearly 95%csbntrol"and was far'
superior to the 4 lb. rate. Control or crabgrassw.l.th 5 lbs. Dalapon resulted .
in a 24%irorease in yields of potatoes over yields on untreated plots, Table 1.
The crabgrass tleedlings on treated plots grew 3 to 4 inches in height befar~
death occu1'!'ed. ,,'
Moderate control or barnyard grass was obtained with Dalapon at 4 and
5 lbe. per acre and resulted in ihorea8ed yield of potatoes at two locatione
where this grass was the JI':l.maryproblem, Table 2.
Table 2 - Effect or GranuJar "Formulations of CDAAand Dalapon Applied at
La,y-by to Potatoes, on J3a~rd Grass and Ytit-ld8 of Katahdin
Potatoes, Connect1cut - 1961
Farm D
Farm S
CDAA 20G
(Randox)
Dalapon lOG
Active Rate
)bs/A
Barnyard Yield 1/ Barnyard Yield 1/
Grass % ot· Grass % at
Control Check: Control Check
9/22 9/22
% % %
3 60 2/ . 85
4 75 2; 95
4
5
50 1123/ 70
75 99 4! SO
%
III
21
1284;1
107 5
1/ Yield, 2 rows x 50 feet, in percent of yield of adjoin:ing check.
\....... 2/ No adjoining check for cOlllJ:'B-rison
3/ Average of 3 comparisons 4/ single comparisons 5/ average 2 comparisons