Vol. 16—1962 - NorthEastern Weed Science Society

Vol. 16—1962 - NorthEastern Weed Science Society Vol. 16—1962 - NorthEastern Weed Science Society

08.06.2015 Views

436 several speoles of Potamo eton ,(Po amPlifol~S, P. crispus, P. pusillus, an.... ~.• atans •. Othe.r sUb~.rc... weeds are present but in limIted'a"_ • . . .:. . " ..' '.' .' ',

'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$; dotted the surfaoe. Submersed weeds (Utrloularia) responde~ in muoh the same way. They.were reduoe! cr nearly eliminated in qUiet waters, but not in the deeper and more exposed ohannel area.! .-: J t) I Areas I and II oan be oommented upon'·together. Exoept',ltor a narrow band olose to shore •. these areas responded suooesst.lly to tr~atment. By early september the surtace was well olea~edof 111y pads,and the submerged weeds (mostlJ: Utrioularia) had·IQeen ei tbel" eliminated Qr muoh re(1uced •. Along~:the west shore, a cmos-s, hornwort, and some water 1111es form an:exoeedingl~ dense b~r.d&r of 8 feet in wldth. These plants were not eliminated or substantially reduoed. As fo.r the Potamoge~. it is very diffioult to judge. InsparElel-y populatedare",s. it seems to di~ appear With treatment, b"t in densely popQtated areas, ther$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. .I 'r::- i ' 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

436<br />

several speoles of Potamo eton ,(Po amPlifol~S, P. crispus,<br />

P. pusillus, an.... ~.• atans •. Othe.r sUb~.rc... weeds are present<br />

but in limIted'a"_ • . . .:. . " ..' '.'<br />

.' ',

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