Vol. 16—1962 - NorthEastern Weed Science Society

In the'Dundee Creek series. ,one of the f'1shdltdbefore herbicide
application aJld Is exclUded.. Onthefil'st day aftet'lappl1caUon, all i i
were al1ve~' Thisdseries remainedlilChecked until ~9f,aays after appl1catioil.
whenaga,inallfish. present. wel'.',Ulve though.s everilhad escaped. Local I
fishermen 'occasionally examined the) Cages througho'l1t f'the period and repor~
ed no dead fish iii them up to the 'time they were '1".'84 1n late summer. ' .
Theyalsoneporteclthat t1shing'.sgood in theplot,trom which the herb~';;:
cidehad. cleared the milto1l. Tnetisb caught apPe$ted ttl be normal and "
wel'l!of excellent·"flavor. ' "
1 '1 t j r
.M!mOBISDmtQPMENT. The'p~e'Where anaerob conditions developediasffn'.,a;cove'containing
veJlt'it41nseM io 1 ;~61"owth. The bottom
wasasottmuclt ",Hh water depth'9t,4 to fee, riding upon tidal .
stage. Rate of 2,4-D application was 60 Ibs. AE/A. ,'lEttects of the herbtl"
cidewere well contained within th~ plot and, ast1)e mass of weeds died, it
sank to the blJttom and was not dls»laced by current,. On the first day
aftu :aPPl1,cat1on,all'a.nimalste~~al1ve. 1abula~ of the oyster!! isi
shown.1nTable4. '. '" ',::- .! " •
~: .., ~~ . .2:1,.r :
'Days
ExpOsed
i. TAiLE4. CIJMRLATtVE lfBER
OF OYSTER~ ATPLOT10
455
r.
1 0
,f 0 0
~. ,..
i. 1
5 4 j •.•.. :;O 0
9 8
, 0 0
rj r
16 16 2 0
~ IJ
34 . 25 2 relllffed
Th~ 5 fish and 4 crabs present In the center '~ at the time ot application
were alive after one day. B,rthe 5th day, 1 t~sh and 3 crabs were
dead. On the 9th day, :3fish and all 4 crabs had.df~. One fish was alive
on the 16th d81andnone atthe end of observationsFNo predation occurl'fi4
lnthecenter cage but did occur:1nthe other two. )'two:fish survived to the
34th dat in the' cageoutside theedte and 2 crabs t~\'the 16th day. .
NATURAL FAUNANDFLORA.Numbersof fish, mostly menhaden (Brevcer~
tYTannis) were observed swimmil18in,the Potomac area plots both beforea
atter treatment. ~ottom samples were taken by Peter,en dredge in early May
and againih mid~JUne trom the trel~ment plots in tat Machodoc. These have
been analyzed by Dr:MarVinWass of~ the Virgin1a Iri~~~ tute of Marine "
Science. He concluded that, for these samples, thedetect10n of changes due
to the experiment 1s ne~ted by na~ural seasonal Ch!Ulgesduril18 the long
time interva.l' that' resulted from pO'stponementof thet's~heduled treatment.
'. . . "( .