Vol. 16—1962 - NorthEastern Weed Science Society

'j 437
petioles, now elongated,f'ortoed miruature arches above the'L·'.
water; the ,pads overturned and theentire,jplot presented a4"8ddiSh
oast oompared to the surrounding untreated green area.UBy
the end of the first week, the surface supported a tangled mass
of stems, leaves ,and bloa'8dms, whioh stlon:began to deoompoee.
From this point on, deoomposition proceeded slowly, more al",,1y
than in previous years. Whereas the surfaoe of treated a~••
usually had been free of pad. by late JUll,' they were not.tjoee
of pads until August or earl~ September i~ 1961.
In oaves or little bays of area I II" where the waterw&s
qUiet, the 111y pads disappeared more qUickly, as well as mQre
oompletely. In the region of the ohanneL~exposed to win~
and probably a small ourrent, the treatment was not as effe~t~
1ve, and even in september oonsiderable ngmbers of lily pad$;
dotted the surfaoe. Submersed weeds (Utrloularia) responde~
in muoh the same way. They.were reduoe! cr nearly eliminated
in qUiet waters, but not in the deeper and more exposed ohannel
area.!
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Areas I and II oan be oommented upon'·together. Exoept',ltor
a narrow band olose to shore •. these areas responded suooesst.lly
to tr~atment. By early september the surtace was well olea~edof
111y pads,and the submerged weeds (mostlJ: Utrioularia) had·IQeen
ei tbel" eliminated Qr muoh re(1uced •. Along~:the west shore, a cmos-s,
hornwort, and some water 1111es form an:exoeedingl~ dense b~r.d&r
of 8 feet in wldth. These plants were not eliminated or substantially
reduoed. As fo.r the Potamoge~. it is very diffioult
to judge. InsparElel-y populatedare",s. it seems to di~
appear With treatment, b"t in densely popQtated areas, ther$c
a,ppears to be no reduction lP number of pl&;nts. l
, , j'
One halr of area I r!&j:utlved a seoond.pp110a tion of K~sal
G on July 5, three weeks. afUr the first¥pllcation. Thisn
treatment was made ~in order ,.to test the v1:80Zlof a large pa1i~
of NUpp!r advena whioh had not. beenaffeo'ed by the first appli
ca tion.. By the end at . twoweeks, thepA,ants were dying. ~d
by early September they w8l"'e.-declmated, bu:1l.not oompletely
eliminated.
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It may be oonol1uded that, ln genera1., ~~haea, BrasenM,
and Utr!1oul~rla res,ponded l1uooessfully tOfJLIlithree weedio1i$8
when applied at a oonoentra1iion of 2 ppm. ".No one of the thl"IH
weedloides proved more effeotive than the,-other two. I
The summer of 1961 3,n P:utohesEl Countl:W8,:S hot and humid
With all" temperatures oft.enj,n high 80'.S~; low 90's. FrPm.i:
May 31 - September 20, bottom, tempe;ra tur~-ttd):r- the pond variei1.
with the usual seasonal ~enQ.. Op May 31iot.ne temperature "Joil
a 0001 60 0F, whioh rose sharply during a hot period in early
June to 78 0F. During the AA~terohalfo:r. ~nei .and early JU::LY,
the pond oooled to a conatan t, 74 F, but %?qse",galn by mld.... Ju.iLf
to 80°F. Although no sample~ were taken 1~ AUgust, it is