Vol. 16—1962 - NorthEastern Weed Science Society

All treatments produced si~1f~c~tly higher y1e~ tqan the check
except for 2 po~dlof.Atrazine ~t~~',~~ 2." d'.[ ': .'. .
. : -, ,,_. ' : • '~"J _ '.- '. .
1961 - As indicated in Table 5, this' was an excellent year for Nutgrass control.:
The pre-planting treatments of EPTC,Tillam, and R-1870 all gave good control
of nutgrass for the entire season. The £PTeat 6 pounds, however, significantly
lowered the yield of corn. All other ~terials significantly increased the
yield. On the basis of yield and lffl~dlcontrol it woul~,.appear that R-.1870Jls
the most prOll\idngc!hemical in th1~.~o~p.. • . .
TABLE5. Ratinls.of Nutgrass contr()r'~dyield of cci~:for 1961.
Rate :.'j Date of Rattms * yield
Treatment Ibs/acre '1'1;-.: @W /'JJ!L.abu/acre
_;_. t
)(·S
EPTC' 3 pre':'}!f~t, '8 9 84.1
,EPTC 6 Pte~~~~t 8 7 ,10 49.6
, _..... J
Tillam 3 Pte-plant 8 2 3 86.2
THlam 6 Pre-plant 10 9 7 89.6
R-1870 3 Pre-plant 6 8 7 91.4
R-1870 6 Pte-plant 9 10 8 87.1
....~..,....•..........•............. '.....•...•...•.. ....
Atrazine
0-34162
4
4
Pre-em
Pre-em
............•........••...•.•.••....
10
10
10
7
10
10
, ........•...........
91.8
80.7
Atrazine 3 Post-em 9 10 98.4
Atrazine· 4 •Post-em 10 10 ;00.0
Atrazine 5 Post-em 10 10 86.9
Check 0 0·· 0 69.0
LSDos •
14..5
L5D Ol = 19.6
.• Ratings on a scale of o • no control, 10 • complete kill
32;
'The pre-emergence treatment of.Atrazine at 4 pounds provided good control
'--" and resulted in a significantly higher yield than the checl~. Another Geigy
material (G-34162).at 4 pounds per acre tave good nutgraa. '~ontrol but there
"'ascorn in1urv evi.d..n~ in.,""" 'l'll"foa U_._. __ ~t. _ _ .J.'J u'