Vol. 16—1962 - NorthEastern Weed Science Society

III. Average turf scores l' of three grasses seeded at intervals after -the application of herbicides to the
seedbed: final observations.
.r:-
~
Lbs, active Saine time 2 wks. later 4 wks. later 9 wks.Tater
Chemical % act. Per acre Bent Blue Fes. 2 Bent Blue Fes. Bent Blue Fes. Bent Blue Fes.
frifluralin 2.0 2 27 27 33 3 7 13 10 20 37 17 20 63
frifluralin 2.0 4 20 7 10 0 0 7 7 3 17 7 7 20
Dipropalin '2.0 2 83 80 83 67 80 83 70 63 90 50 77 93
Dipropalin 2.0 4 63 70 80 37 37 57 40 23 87 27 20 87
Dipropalin 2.0 8 43 67 63 7 13 33 3 13 33 10 13 57
Diphenatrile 11.5 30 80 87 73 77 83 90 97 100 83 90 10 90
Bandane (E.C.) 4#/gal. 20 70 70 47 73 87 77 90 90 80 77 60 90
Bandana (E..C.) , 4#/gal. 40 40 37 30 33 37 ~37 50 53 60 33 33 77
Bandane .(Vem.) 7.5 20 87 100 90 73 93 80 90 90 77 73'10 8?
Bandane (Yerm.) 7.5 40 93 83 80 67 60 67 63 53 50 30 30 70
Bandane (Clay) 7.5 20 90 97 90 87 97 90 93 90 87 73 80 80
Bandane (Clay) 7.5 40 87 90 73 73 67 47 57 50 40 33 50 73
Bandane & Chlordane 10.0 20 100 97 60 100 93 93 100 97 87 83 87 77
Bandane & Chlordane 10.0 30 93 100 87 80 93 87 97 83 70 67 70 90
Bandane & Chlordane 10.0 40 97 93 87 63 80 67 57 60 47 40 57 70
Dactbal 2.3 10 50 80 80 33 77 73 17 53 67 37 47 87
~- 2.3 20;( 40
, ,- :4'3 3Q' 10 67 :40 )-~ 1$" 27 ~'(- 7' '·1'1 2?
Dacthal 1,'5 10 40 50 33 10 40 40 3 2~ 47 7 f7 41
:alcium methyl arsonate + 6.0
;alcium propyl arsonate 18.0 50 97 100 93 100 100 87 100 100 93 93 93 93
:aicium propyl arsonate 12.5 40 100 97 90 100 100 83 93 97 90 83 90 97
:heck - - 90 100 90 93 97 93 100 100 97 93 100 93
score = visual observation- of turf -density with 0 being bare ground to 100 being optimun density.
= A~toria colonial bentgrass, Blue = Merion Kentucky bluegrass, Fes , ::Chewing's fescue.
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