Vol. 15—1961 - NorthEastern Weed Science Society

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Table 1. Yield of Silage Corn and Quackgrass Stand Counts, 1959.
Interval of
treatment
after planting
Immediately
'Chemica.l
, used ,
Fenac
Check
:; days Fenac
Check
6 days Fenac
Check
9 days Fenac
Check
,
, Rate/A.
,lhs. A.E.
2
3
4
6
0
2
3
4
6
0
2
3
4
6
0
2
3
4
6
0
'Average yield/A.
'Shoot Counts
r Tons of silage't"If qua.ckgrass
7510moisture 'October, 1959 ,
19·39
20·33
20.12
16.77
17.97
21.18
19.43
18.65
19·99
18.04
21.29
20.74
19.14
21.58
19.05
18.13
17.89
15.15
15·99
15.69
680
434
374
402
48:
404
368
414
289
374
487
468
503
367
367
534
550
619
447
535
367.
The chemical treatments were particularly effective in reducing the
broad-leaved and annual grass problem. The stand counts (3 - 2 sq. ft.
qua.drats) per plot showed effective control of the following species
at all rates used.
Wild Mustard (Brassiea kaber)
Lamb's-quarters (Chenopodium album)
"Red root" l;"igweed (Amaranthus retroflexus)
Yellow Foxtail (Setaria leutescens)
Yellow Rocket (Barbarea vu¥ariS)
Wild Carrot (Daucus carota
Smartwood (Pollionum pennsylvanicum)
The effect of the treatments on the yield of silage corn and their
effectiveness in reducing the number of shoots of quackgrass are shown
in Table 1. The stand counts which were made:in mid-OctobeJ. do not reflect
the differences observed during the growing season. They do refleet
the actual control of qua.ckgrass on the plots.
Fenac at 3 pounds per acre and above prevented the development of
quackgrass for the growing season. It was far more effective than 2,4-D
for broad-leaved and annual grass control.