Vol. 15—1961 - NorthEastern Weed Science Society

112.
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Tab1~ 1. ~ean marketable yield of beets (lb/20 ft of row) and mean frGsh weight of
weeds (lb/20 ft of row) following treatment with diiferent herbicides.
Rato
Herbicide (lb/A) Beet Yield Herbicide
-----------_._---------------------­
Control H914
CDEC
R.2061
R.2060
R.2060
R.20b1
CDEC
Endothal
Endotha1
Endotha1
Endotha1
Endothal + TCA
Control BC 5
TD-62
2
15.1 1
8 13.9
6 (i) :3 10.1
6 (1) 9.9
4 (i) 8.1
4 (d ) 7.8
5 6.0
12 3.7
8 (1) 2.8
8 2.4
12(1) 2.2
8 + 8 1.3
O.?
8 0.6
Control HIT
R.2061
R.2061
CDEC
CDEC
R.2060
R.2060
Fndotha1
Endotha1
Endotha1
Endothal
TD-62
Endotha1 +
Control BC TCA
Rate
(Ib/A)
6 (L)
4 (1)
8
5
4 (L)
6 (1)
8 (1)
8
12
12(1)
8
8 + 8
~oed o:;;t
1.1
5.3
5.4
8.0
12.5
12.8
13.8
15.4
16.1
16.8
18.9
19.1
25.5
TIjth the exception of CDECat 8 Ib/A, all treatments resulted in marketable
beet yields significantly lower than the hand weeded control. Some stunting
of beet seedling growth was observed, but this did not influence final yields
obtained. Previous trials at Ottawa have indicated that CDECprovides questionable
commercial weed control. Nevertheless, of the herbicides evaluated to date, CDre
has provided the most effective control of annual broadleaved weeds.
2Treatments that
using Duncanls
are
test.
grouped by vertical lines are not significantly different,
3{i) Chemicals
pre-emergence.
incorporated with a rototiller prior to planting, other chemicals
4HW- hand weeded
SBC- band cultivated