Vol. 15—1961 - NorthEastern Weed Science Society

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extensive
tests bave shown that ~h~ dL~q4iua en40thal initially applied to the
water in tbefield ~apidly di.appears. ' tn' tests where Aquathol is applied
at 5 ppm of the active ingredient, residue has been shown to completely
AAa,.~a~"i;n ~.~p~,}I#&x,.,..i~'i~, ~t'I:~a J4:~:10 })rA (flv:~~_~~~ the, .t;~t. that
-wou,td,1\0I'1UJ11y,be .:1.l.. ~4, ;o.n:4A.·o;v.. ,ll tr.~~.nt .b~e) i -tlie residuewaa
~nto '''~0~0t9\'~~X7 d~~"p~! .~ fQ~'4~.;a~~p.P;a1 tbere,sld ue
With reference to the second' point, name ly , shor t residual
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ac don"
' WJ.I."
wUJo~ in,ab,o~t: ,7~, Jlo,~~(~ we). .one .cpns1uf,s¢b.itt the, n0l'll81
ov.r.a~~ tr,eataell~._ N.:~~l ~~ ).; '"the~eQse jof.,o. :t.P-t;tJo p~). ~hen O1\ecan
-raallz8 one ,the, :aeJ,r.a,tq.eI, ~oru.~ ..,,-~ha· ~t.J:'ial. '
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There 1'. considerable '~vlde~.to liidlc~te' thatth~breakdoWn of. the eli,odium
endothal molecule ie due to biol:ogical act(on •. Due' to the fact that
tbere are no beavy metals involvedi. the .• olecule build-up in the bottom
mud or in the water is not po.sibl.~ ~Current recommendations are that
the water not be used for domeatlc.p~~po.e. for 7 days following treatment.
Tests regarding fiab residue were run u.ioa radioactive di.odium endothal
on goldfish at 6.0 and 12.0 ppm" and s8lmonr,et 2.5 and S.O ppm, by Dr. Virgil
Freed, Oregon State College, and Dr. 1110 Gauditz of rennsal't: Rather
th,~go ,in~od.~~11..,. ~.. ~~~p.~F' covJ,,",,.be 8U1111U11c.ec1,I. dlat no significant
encJothal resi'dtie'-was prea'etit' in the fhh used in the t;e.t even at ,the bighest
rates.' ,.,
. ·~o~~~"p,s,.i~~l~' 'i~~»ii:}t ::qi~cer.. ~i,th· l:e.pec,t ·~x.aid\J6, i.~possible
".a,
b~;1~_.upin r.'~.t~t.Pil.. t8'r)A'i ADachar~i(qJ:'llod.a~. i~ is ...OW called)
d
h~,••.l.t,.nt .co "ocU''''''~e~40~l, ,tb.18 "eed ..leetecl. Dr. V.iratl
FJ:•• d,lIlld '~.'. G.t.¥ii~&. :C9Q.~.~,e.~ itud~. 1f,1,th:tb~ ra:di,:tactivect1ao4ium en­
,c,t,Ort1i,.1 on ·~~.s.~~it!••.. «:Q~l\lSl,C?fts fraa, ~".,"'01;'k.~e,s~1zed ~.t
·d~~9~~~~~'~~~tll.t.i~.~qo.t .:~,i~lY tqa~C;:QIIUlate)o .aquat.itc plants. ,(Dr.
Freed is aivins a paper at this NBWCCconcernin. tecJ.uU.quea involveclin
theae studiea, and 1 hope that those interested will'attend).
t~&~rdin8f·~on~ider.iI~~ th~e~, w'i'~h resp~c~ to i'fiah toxiCity in laboratory
tesu" blue gills >~"v,•.'bj~~~h to ~.J;'a~over, :100 p~ for· 21 day.
(when the tesU were d1scoridnued). Ll~8'.-,JlO.1l'tal1ty of three species
of m1l\Dqw., ,.;'df,~nf!!trOJ!ls_rltiU,),.A.4. ~n4lp~, QietE92is lutuad.),
and Bluntnose ·(Pi_pal •• nogtua),,-jW.,, ir~ated .at4Q.ppll (the highest
d08age_~e,~'4), .L~k.,,1se, "al~, J:_.i,n\)"'.tr~t, -wb:... , showed no mortaU.tyat"';'l6'ppII'(thelligheat
dosage ~~~""),,:.It,.;4.8 .apparent, therefore,
that with normal u.e dosage8 of 1-2 pPm;' thetei ••.• ddt'-:'1II8rgin of safety
between control level add fish toxicity. legarding field studies,' no fish
• J • _1II9ft.UtLe~,.~.v~ b;~..~ IlQ,:ed,,1n field teJ~.,';o )da~e after applying Aquathol.
':0; >'," t"';"'; e~' ~ ~, ',\, ~ ",' :"1 l~ -'-' :'''~ , ... r~'~ , ,f • - . . • .
>
,One~tii~*'t9 J~~~n,; Q~' .~~J:~. ;,h~ev.4tr" 1s t~.t :.qu':tPql·.~. a coatactweed
"~lll,r~' .11~4.t"co'4~t~cm~ o•. be.~ ,,,ed "ar~th",tb,e ,~e~' ..,t·:tIIka care
~~,}~e.!t o~~y .p~~~,?QS; ~f'Jtl\",,:po~4 ,.01' lake ;,~I~ ,~f:tq pJ:.evenC;,,kill ;of fish
fr~ 9~1...n""P~,tiQIl,,,du';t9;d.ca7~n~ " ••• t __tio~., ~;.wo"l.d ,be ,the,caBe
whe~" ~ ~.~~'p,.,,;)w.•• u.~~·A~n,. p~ctcv~~')L·.~sceptible ... d (',Jiith
r~.~p.~t t:p,.,tO](i~l1:l(;i"o ~~tt~ f~uln.~:. ~t~ in