Vol. 16—1962 - NorthEastern Weed Science Society

:lBummary
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1. Th%"e&~xpe1"1IDenta], ar-e•• Were ohosenli_: the shore ot:,rtidhg
Pond.: :NCor these weH'ohe ao:re, one •• but,a halfaoM.
'v. ~ fIJ"-':>: .. :;
2. Observa t-t.()hs.on theeeVA8 J were made ·lll"OlIf May.)l - Oot~
4, 19p1. . " ":j,'~.; ';: ':).t .. ' '
3. Prel1mlnary et-udy of the tollowingoondt'tione and organ­
1.llls,\' __t...o~r.~Qg QU1;,t...r2ll!Jlay31.,-.J'Y.n4LZ;. ,bQttOlll temperatures,
.pH"jA#.:ssolved, oxygen ,oontent, plankton population,
benthio 'popUlation " lILrgeaquat10 vertl!lt>1'ates, andpondweeds.
Afte.%-treatment, thiS prooedure wa~repeat.ed June
14-16, June ZO-23, July 5-7, July 22-24,~.hd September
19-26. "
4. The three areas were treated on June 1) With the same concentration
of weedicide, namely 2.2 ppm. Area I received
Kurosal G, Area II a 2, 4-D Ester,andArea III Kurosal 8L.
5. Within a narrow marg1nal border of extremely dense growth,
surtace and submerged weeds did not respond to treatment.
6. Wlthln more open portlons, although stll1 of dense weed
growth, weeds dld respond.
7. N!iPhaea odorata and Brasen1a sp. were suocessfully ellmlna
ea1n most areas.
8. Utricularia purpurea was eliminated ln many areas, and
greatly reduced 1n most areas.
9. Nuphar advena was dec1mated, but not ent1rely oleared, even
after a seoond application.
10. The three weedioides used appear equalll etteotive. No one
appeared to be superior.
11. The temperature of the bottom water showed seasonal variations
within 60 0 - 800F.
12. The range ot pH was between 7.4-8.0, and followed the
pa ttern of the oontrol.
13. The fluctuations of dissolved oxygen content were between
4.5 - 9.5 ppm, and paralleled those ot the oontro1.
14. The plankton was represented oonstantly bl the same groups
as 1n previous years. The rlse and fall in abundanoe of
individual plankters refleoted seasonal trends, and were
obvious in both experimental and oontrol ~reas. No period
of deoreased numbers or aot1vity was observed after the