Vol. 15—1961 - NorthEastern Weed Science Society

99.
Third applications were made on July 6 and 7 at comparable rates
applied for the earlier treatments. The plots were h~nd weeded
prior'to this application. The tops were in the early stages of
lodging and therefore uniform coverage with directed sprays was
not possible. Granular formulations could be applied more effectively
with virtually no leaf burn. The plots were split with
one half receiving the 3 applications and the other half receiving
2 applications. Observations 7 weeks later showed a complete
cover of weeds on the untreated plots with a predominance of purslane.
Randdx T at the lowest rate (4.2 Ibs CDAAequivalent per
acre) gave near perfect control of purslane. Little difference"
in control could be noted between 2 or 3 applications indicating
that the residual activity of the 2nd applications was sufficient
for purslane control. Randox at 6 Ibs per acre in either the
granular or emulsifiable form did not give comparable control
even with three applications. .
Summary
Randox T at rates of 6 to 9 qts or equivalent rates in granules
effectively contr~lled all weeds except smartweed applied early
in the season (1st application). Smartweed control following
the 2nd applications is slightly superior to Randox when compared
on equivalent CDAArates with Randox T. Purslane control was
markedly superior to Randox.
LITERATURECITED
(1) Gleason, Lowell S. lIRandox" T A new Broad Spectrum Preemergence
Herbicide. Proc. of North Central Weed Control
Conference. 54 - 56 1959.
(2) GOdf"rey, K. L.and P. D. Hamm. f1RandoxtrT A New Chemical
Weed Control Mixture for Corn. Proc. of North Central
Weed Control Conference. 55 - 56 1959.
(3) SWitzer, C. M. and M. H. Dickson. Chemical Weed Control in
Celery. Research Report, Eastern Section. National Weed
Committee (Canada) 1960 In press.