Vol. 15—1961 - NorthEastern Weed Science Society

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Two ground methods of herbicide application were tested in an effort to
overcome these disadvantages and make foliage application of herbicides
possible where aerial application is not practical or desirable. Standard
tested mixtures for aerial applications were used in maohines whioh put the
material out in a fine mist similar to that applied from the air.
507.
THE TRUCK.NOUNTED MIST BLOWER
A truck-mounted mist blower of the type commonly used to spray shade
trees was tested in 1951. The blower, a self-powered unit which could be
mounted on a tractor, jeep, or truck was used. It delivered 10,000 cubic
feet of air a minute at 150 miles per hour at the nozzle. Trees up to 10 t in
height can be sprayed with this type of machine. Easier coverage of the
forest could be achieved by mounting the machine on a crawler tractor instead
of a truck so that travel in the forest would not be controlled by road
location. Machines specially made for forest mist spraying are now available.
SPRAYMIXTuRES
Four aerial type mixtures of spray were used in the trUCk-mounted mist
blower tests on August 21, 1951.
Test 1: One pound 2, 4, 5-es acid equivalent in a gallon of fuel oil
and 3 3/4 gallons of water applied at the rate of 5 gallons of mixture
per acre assuming a 5-chain C330 ft.) depth of penetration from the
location of the mist blower.
Test 2: Two pounds 2, 4, 5-08 acid equival'1lnt in a gallon of fuel oil
and 3! gallons of water applied at the rate of 5 gallons of mixture per
acre, again assuming 5 chains of penetration from the location of the
mist blower.
Test 3: One pound Kuron in the same quantities of oil and water as
. Test 1.
Test 4: Two pounds Kuron in the same quantities
Test 2.
of oil and water as
Spray mixtures were formulated assuming a 5-chain penetration of spray
from the"truck location. Less than one-half that depth of penetration was
achieved.~ No reasonable estimate of spray concentration per acre could be
made, because there is no way of knowing how much spray material blew out of
the area.
METHODOFAPPLICATION
The truck-mounted mist blower was operated from a woods road. A trial
run was made with a nozzle attachment that gave a very fine spray which 'Wen\-.
only a short distance. With the nozzle removed, the spray mixture flowed
directly into the air stream producing larger size dr()p1.~t.s, and gl:ea ter