Vol. 15—1961 - NorthEastern Weed Science Society

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512.
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and the weather was toggy while .the work progressed. later in the day the
trees dried olit, and they were f~lrlydrY' by 2:00p.m., when a shower
occurred •• Wind movement waS less than five miles per hour.
, .
Area h was a natural stand of pine ranging fran seedling size up to
18 r in her~ht •. Pine stocking ranged fran -wry spu'se to very dense. The
hardwoods. prest;lnt were of the same geQeral height or overtopping the pi.ne.
Species were predo~t1y gray biroh and red maple :with accasiorAl other
birchelf and oakS. " There was an abundance of other woody plants like
huckleberry and sweetteI'D in the more open situations. The wind ranged
from 10 to 20 miles per ho~ and seemed to carry the mist away fr·om the lower
vegetation such as huckleberry, which occurred in pure stands about 3 feet
tall.' The huckleberry was not affected by the spray. None was found to be
damaged on 1,plots.
Area 5 was a pine, stand cut in the winter of 1957by the' shelterwood
methOd. St:erse pine and hardwood regeneration' was present. Most of it,
small in size and not very evident at the time of cutting, was beginning to'
grow well at the "time of s~&y~ng. The wind was still' during .the spraying.
Rain fell. that evening.
. Area .pwas a twenty,:"year old pine and hardwood stand of the same general
height, with some larger overtopping hardwoods. Tree species represented
were red maple, 'graY ,birch, pin cherry, red oak" and white oak. The day was
cool; wind was 10 to 20 miles per hour. No rain fell for several days after
the spr~y1ng •
. .A.rea·1 ~as aforty~year old pine and hardwood stand wittr the hardwoods
in the upper crown canopy. The. stand was canpoBed of. red oak, white oak,
and red maple. Black b,irch, gray birch, 'white birch, and yellow birch were
also present along with beech and pincherr,y., The weather was the same as
fo:, area 6. This a~awas treated with Kuron at one pound-acid equivalent
per acre. An the others were- treated with 2, 4, 5-OSat the on..,;,poundrate.
,RESULTSFROMTHESHOULDER-MOUNTED·MIST BUM-IOO.
Results were determined ,by measuring seYenty-four concentric ·circular
plots II1ech&n1ca~1y 'located_ by canpass and pacing; early in September the
year after spraying.' ,.'
The oaks proved to be most sU8c~Ptible to the' herbicicle. Sane oaks up
to 60 feet inheisht were. killed by the 8houlder~ounted rigs, where the
maximumheight ot other species killed was aboat 30 feet. Aspen was the
most resistant tree species to the spray. Woodyshrubs like huckleberry,
blueberry, sweet fern, and laurel were les8 damaged.than hardwood tree
~pecies' of the same size •. More e.f£ort to get: the JQ&terial directly on the
l&sser vegetation woUld probably :lmprove control of this material. In the
wor-kmachine operators were instructed ,to direct the. spray at hardwoods
ir-terfering with the growth of softwo04s, and asa oonsequence the spr~ was
seldom directed at the low brUsh.