Vol. 15—1961 - NorthEastern Weed Science Society

113.
fndothal as a pre-planting incorporated treatment provided very
cisappointing weed control, in contrast to the excellent results obtained with this
application method in 1958. This herbicide applied pre-emergence has always been
ineffective at ottawa. The addition of TCAto the pre-emergence application of
endothal provided excellent control of annual grasses, this was presumably due to
the effect of TCA.
The EPI'Canalogues R.2060 and R.2061 were less harmful to beets than EPl'e,
but R.2060 was not a satisfactory herbicide at the rates used, while R.2061 injured
the beets.
Carrots Red Cored Chantenay carrots were planted on May 12, 1960. Chemicals
were applied immediately after planting or post-emergence on June 2, when the
carrots were in the first true leaf stage and the weeds were 2 to 3 in high. The
weeds presented in the control plots were commonlambsquarters, barnyard grass,
commonpurslane, redroot pigweed, and shepherdspurse. Table 2 contains the marketable
yield of carrots and fresh weight of weeds which were obtained from 25 ft of
the middle row in each plot on August 11 and 12.
Table 2. Mean mar~etable yi~ld Qt carrots (lb/25 ft of row) and mean fresh weight
of weeds (lb/25 ft of row) following treatment with different herbicides.
Rate
Rate
Herbicide (lb/A) Carrot Yield Herbicide (lb!A) ileed 1?t
___
iii
,",
Amiben (L)6 4 28.6
Amiben (G) 4 25.0
Solan 4 (ii)7 22.9
Dieryl (L) :3 (ii) 20.0
CIPC 6 19.6
Solan 3 (ii) 18.9
Dicryl (L) 4 (u) 18.1
Varsol 80 gpa (ii) 17.4
Daethtil 8 14.5
CIPC 4 13.8
Zytron (G) 15 12.6
Dicryl (G) 4
Prometone 4
,Control BC
---
Amiben (L) 4 2.0
Amiben (G) 4 2.4
Prometone 4 3.8
Dicryl (L) 3 (ii) 6.5
Dicryl (L) 4 (ii) 6.6
Solan
4 (ii) 10.2
Varsol 80 gpa (ii) 11.5
CIPC 6 12~3
Zytron (G) 15 14.4
Dacthal 8 15.8
Solan 3 (ii) 17.8
CIPC 4 23.3
Licryl (G) 4 32.8
Control BC 41.8
R(L) liquid formulation, (G) granular formulation.
7(ii) che~ical applied post-emergence, other treatments applied pre-emergence.