Vol. 15—1961 - NorthEastern Weed Science Society

413.
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gallA of Urab Liquid Concentrate in either oil or water
carriers appear to have effectively controlled wild cherry,
white birch, poplar, oak, willow, sassafras and poison ivy;
2) red maple, locust, elm, bush honeysuckle and climbing rose,
although initially 100 percent defoliated, now exhibit leaf
regrowth. For the most part these leaves are small, undersized,
and chlorotic with the amount of leaf growth present
10 to 30 percent of normal; 3) dosages of 3-1/2 gallA of Urab
Liquid Concentrate in both oil and water carriers appear to be
as effective as the higher rates against the more susceptible
wild cherry, birch, etc.; but this lower rate is not as effective
as the higher rate against the hard to kill maple, locust
and elm.
Tests have been conducted also with the Urab pellet formulations.
In Canada dosages as low as 20 Ib/A of 25% Urab pellets
applied as broadcast treatments effectively browned out topgrowth
and defoliated black cherrYA white birch, maple, willow
and conifers. Dosages as high as ~O-lOO Ib/A of 25% Urab pellets
applied as broadcast treatments were necessary to defoliate
oaks in New Jersey. The pellets do not act as rapidly as the
liquid Urab formulation, and results to date indicate the
pellets are more effective when they are applied as spot treatments
to clumps or individual trees.
Tests have also been conducted with Urab wherein it was
combined with 2,4-D, 2,4,5-T, 2,4-D-2,4,5-T mixtures, Amitrol
T, Kuron and Kuron 245. QuiCker topgrowth brownout occurs with
such combinations than when Urab Liquid Concentrate is applied
alone in water.
SUMMARY
Field tests conducted during the past several years show
that Urab applied as a dry granular or pelleted product containing
22 or 25% active ingredient, or as an oil soluble or
water emulsifiable 3 lb/gal liquid concentrate effectively
control brush.
White and yellow birch, sassafras, staghorn sumac, wild
cherry, oaks, willow, poplar and sassafras are among the more
susceptible woody species, but promising results have been obtained
on red maple, conifers, locust, elm, poison ivy and
briars.
The liqUid concentrate appears' to be the most effective
when applied as an overall foliage coverage or basal treatment,
and the granular and pellet formulations are effective when
applied as spot or broadcast treatments.