Vol. 16—1962 - NorthEastern Weed Science Society

215
Table 2. Bffect of pre-plant herbicides and weed competition on marigolds.
Checked eleven weeds after treatments.
~tDe of TransDlantinR After Treatment
Active 1 2 1 2 3 4 5
Herbicide Rate day days week weeks weeks weeks weeks
Casoron 0 0.83 1.04 0.38 0.58 0.58 1.25
211A 1.21 0.67 0.50 0.63 0.17 0.25
44/A 1.50 .1.88 1.33 1.00 1.33 1.25
81/A ·4.50 3.71 2.29 1.67 1.17 2.25
EPTC 0 1.13 1.63 1.21 0.79 1.00 2.08
2W/A 0,67 0.25 0.71 0.42 0.46 o.n
5'/A .0.29 0,33 0.25 0.08 0.04 0.08
1011A 0.33 0.46 0.71 ! 0.42 0.21 0.54
a-1607 0 0.92 .1.54 1.50 0.79 0.96 0.88
21t11A 0.38 0.33 0.13 0.29 0,13 0.33
511A 0.75 0.50 0.04 0.13 0.38 0.38
1011A 0.08 0.71 0.21 0.17 0.17 0.13
Till am 0 0.71 0.54 0.58 0.63 0.54 0.75
2%#/A .1.13 1.08 0.71 0.50 0.58 0.47
lilA 0.29 0.38 0.33 0.42 0,00 0.38
10#/A 0.83 0.67 0.53 0.21 0.71 0.13
Vorlex 0 2.13 2.33 2.00 1.33 1.83 1.38 1.83
t Qt.!lOO sq. ft. 4.58 4.25 3.21 2.58 2.88 2.79 2.83
\ Qt./lOO sq. ft. 4.25 3.71 3.21 3.44 3.06 2.83 2.92
1 Qt./l00 sq. ft. 3.17 2.42 2.29 1.00 0.92 1.42 1.33
Plant Injury Scale:
o - No Inj'lry
1 - Very elight chlorosis or necrosis
2 - Slight chlorosis cr necrosis
3 - Moderate chlorosis or necrosis
4 - Severe chlorosis or necrosis
5 - Dead