Vol. 15—1961 - NorthEastern Weed Science Society

Applications may be made at time 01' transplanting or as lay-by treatments. In
the ornamental field, peonies are reported as tolerant~ pans ies are not tolerant.
. .
For optimum results with .Amiben, moisture is essential. Irrigation or
ra.infall sufficient tor good crop· growtb 18 "uff1cient for weed control.
Someweed species reported resistant to Amiben are: Galinsoga, Carpetweed
and Morning Glory. Some grass spec ies may require h1&her rates tor satisfactory
control: FoxtaU and Barnyard Grass •
.Amitrol-T
There is So marked increase in the. activity of Amitrol-T over .AminoTriazole
in the powder formulation. It 1s moreetfective on cattails, (ECluisetum spp.),
m1J.kWeed,leafy spurge and. cypress spurge than the powder and is equally as
effective on Canada Thistle, hoary cress, and perennial. sow thistle.
Amitrol-T at 2 pounds per· acre as a plow-down treatment followed by
Atrazine at 2 pounds pre -emergence looked exc~llent tor quackgrass control in
corn. Early post-emergence cultivations (1 to 2) are essential for good control.
Some reports indicate promis 1ng co~trol on nl,ltgrass. with Amitrol-T.
Amiz1ne
Looks promia 1ng for general vegetation control at rates 01' 10 to 12 pounds
active per acre. Several reports indicate effective weed control in woody
plant nurseries, forest plantations, ornamental plantings,· orchards, and around
highway guard raUs, route signs, 'etc. For'nUrsery or forest plantation weed
control, 4 pounds of active chemical per acre as a directed spray has controlled
most weed problems without injury to woody plants. Most coniferous and broadleaf'
trees and. sbrUbs are sufficiently tolerant.
lilac.
Some ornamentals reported as susceptible include privet I honeysuckle and
Casoron (Niagara 5996)
This compound shapes up as a. promising pre-emergence herbicide ona number
at different crops. At rates of :; to 4 pounds per acre, the control of annual
b.road·leaved weeds and annual grasses has looked good in corn, beans (lima and
snap), peas, potatoes, soybeans 8.Ddsweet potatoes.
The most promising approach tor Casoron appears to be treatments that are
post -emel~gence to the crop but pre -emergence· to the weeds. A "weed-tree II
situati?n is a "must" a1; the time· applications are made. Using this approach,
p·,~om1e1..'1g resUlts were reported in cantaloupe I celery, cucumbers, gladioli,
peppers, sweet corn and tomatoes.
SoU type would appear to be an important tactor in the initial and reSidual
effectiveness ot Casol'on. Applications on the heavier soil types have
resulted in less crop inj.ury than those on 11ght or sandy soils.