Vol. 15—1961 - NorthEastern Weed Science Society

Four, six, and eight pounds of Dacbh.s.L per acre (Tables 2
and 4) are insu'fffcient for adequate broadleaf weed control. ­
Twelve pounds of Dacthal did not dift'er significantly in effect
from mixtures of 6 pounds of Decthel plus 2 pounds of Trietazine,
8 pounds ot' Decthal plus 3 pounds DNBP, or 3 pounds DNBP plus
2.22 pounds DaIa pon , Dact~~',~venat the 12. 'Pound rate did not
completely control smart w~ed (Pol7sonum spp.) or mustards
(Brassica spp.). Eight pounds of Dacthal in the block reported
in Tables 3 end 5 gave satisfactory: broadleaf weed control because
fewer mustards andsm$rt weeds were present than in the block
reported in Table S 2 end 4. '
Data in Teble .5 indioate the extent to whioh Trietazine­
Decthal mixtures may incrcaase broadleaf weed control over that
obtained from Dacthal alone;
Herbioide Percent Control
8, pounds Daothal 77.8
8 pounds Daothel plus 2 pounds Trietazine 92.4
4 pounds ' Dacbha I, plu,s 4 pounds Trietezine 92.8
'.
6 pounds Daothal plus 2 pounds Trietazine. 80.9
6 pounds Deothsl plUS 4 pounds Trietazine 89.6
The effect of, Trietazin-e alone on weed control is shown from
"''tests in other orops. Peroent weed oontrol for all or,ops has
peen. averaged to obtain the fol~low1ng data:
percen t' weed oon trol Yield: Average
rank for all
Herbicide and Broadleaf Annual blocks of tolerant
rate/acre grass crops. 1 = lightest
yield; 10 = lowest
yield
.. '.
"8# Daotbal'" 68.8
6# Daothal 58.3
4# Daothal ' 44.4
1#. Trietazine 91.6
2# Trletazlne r 92.3
6# :Oacth~l 7'.2.#.T~i9tazlne 89.2
8# Daothal + 2# Trietazine 9~~4
'3#DN.BP+2.22# DEl,).apon 78.6
The increase: in annual, gr.liUH:\ con trol for the muturas compar-ed
to Trietazine alone, and tne inorease in broadleaf weed control
'. ",fon th,e .m.~tures,cqm.pare.d to Pacthal alone are presumably signi­
.. ficant~· ,whettier:pr 'np.t tReincIr
The effect of ra1oi'all on the comparative performance of
Dacthal (w~ter solubi:I,ity .O.•5iPpm.) and Tr!etazine {water solubility
20 Ppm.~} is Bho~1nweed control data ~Ol" 1959 and 1960: