Vol. 15—1961 - NorthEastern Weed Science Society

Atrazine, Simazine, Trietazine, Dluron, and F9lane gav~ 91.6
percent·· or higher control of brondlesf weeds, Table 4. E~ght ­
pounds of Dacthal gave 66.4 percent, 6 pounds 50.2 percent, and
4 pounds 44.7 percent control of broadleaf weeds. The highest
percent broadleaf weed control obtained with DNBP-Dalapon oombinations
was 73.2 peroent.
B. Emergence Application of Various Herbicides, Tables 5 and 6.
Two pounds of Atrazine applied at either planting or at emergence,
and emergence application of two or four pounds of Trietazine,
3 pounds of DNBPin combination with 0.6 pounds Diuron, or
2 or 4 pounds of Trietazine produced statistically equal yields 01'
sweet corn, Table 5•. Statistically equal yields ,weI'e produced by
3 pounds DNBPplus 0.6 pounds Diuron, 3 pounds DNBPin combination
with 2 or 4 pounds of Trietazine, and 4 or 6 pounds of Dacthal.
Four and one-half pounds of DNBPproduced statistically lower
yields than 3 pounds DNBPplus 0.6 pounds of Diuron.
Statistically equal control of broadleaf weeds was obtained
with 2 pounds of AtI'szine applied at eitheI' planting or at .
emeI'gence and with emeI'gence applications of 4 pounds Trietazine
alone, or 3 pounds DNBPin combination with either 2 or 4 pounds
of Trietazine or 0.6 pound~ of Diuron. These treatments gave
significantly better broadleaf weed contI'ol than 4.5 pounds DNBP
·applied at emer-genca.
Broadleaf weed control following emergence application of 3
pounds DNBPplUS 0.6 pounds of Diuron did not differ significantly
from omeI'gence application of either 2 pounds of Trietazine, or
3 pounds DNBP in combination with 4 or 6 pounds of Dacthal. Four
or six pounds of Daathsl alone did not give satisfactory broadleof
weed control.
c. Planting Application of Granular Herbicides, Tables 7 and 8.
In a test of granular materials, planting applications of
2 pounds of Atrazine, 2 pounds of Simazine, or 2 or 4 pounds of
~rietaz1ne produced significantly hlgheryie~ds than 6; pounds of
Dacbha L; . Table· 7'. . The dl'ffeI'en ee' fri yield is a reflection of
difference in broadlesf weed control: the tI'iazines gave 97 peraent
or higher conbrol compared to 33.9 percent control for 6 pounds of
Dacthal not worked into the soil and 9.0 peI'cent fo~ 6 pounds of
Decthal worked into the soil, Table 8.
Dacthal worked into the top inch of soil at the time or app1iaation
gave significantly lower b~oadleaf weed control than
Dgcthal not worked in. ~he activity of Trietazine and Atrazine#
however, was not significantly affected by incorporation into
the soil, Table 8. . . .