Vol. 16—1962 - NorthEastern Weed Science Society

224
_lUtTS
The data on number of -.dlllalt lta~.d.iI tOtalt1me of weeding,
presented in Table 1, luggest that the t~ee herbicidel gave comparable
weed control,att.ir lowest, ~d41e and highel&:;~.. relpect1~ly.
An exception ii noted in the p4!rell.ftid,. that tbe tille required to we.cl
th.lowe',trate of ca'Oron wae ile.. erthat of thet;heck than the low
rate, at tha ot~r. cl.'-icals., .' .Tbeshorter t~e~~«ded far annuab
allcomparedw1.th perennials wullue to the slD81~ei,plot ,iz.s and probal>ly
better sol1 preparation before ,t~' herbicidel, wer,.8PP1f.ed.,
TABLE1. NUMBEROF WIlDINGSAND. TIMBREQUIUD,l!'JU)MMAY31 TO AUG•. 3, 1961.
PLOTSWIRE 96 SQUAREPDT PoR PERENNIALSAND48' SQUAREFIET FORANNUALS.
PJB!rwi
HERBICIDES.~lW:I. ,NO. or", TOTALWElDING ~. OF
None
CIPC
CIPC
CIPC
S~
SlMUtNB
SIMA~:m,
CASORON
CASORON
CA30RON
':t::-"'--::::-"'~~~:..::===:'
ANNUALS
TOTAL WDD'UG
(l",./A) WEED~HGi', TDG!,(Minut.s>*' 'WBBDINGSTDG! (Mimat.s>*
7 1/2
15
30
1
24
2'
4
8
*Average of t~ee
3 ll; 181 '2
2 if 73 2
2 SS 1
1 30 1
~, ~ ~
1 34 F:; 1
2 141 2
1 46 1
1 24 1
replications.
, The re.~on,e of eaen .,ecl •• to each rate ol,;tbe her~icide at t~,
two dat.' of observation haa been prepared but hal motbeen included in,
this peper in order to conserve space. Anyone lnt'erested in obtaining
these details.".y request copies .from .the junior ~thor. Table 2
sU~r1.. stb re.ult,s by ebbWil1J',the highest tat.' ~,feach chemicalt~
wa. tolerated by the plante. ' ,
None of the chemicals tested was lafe for all plante. In fact,
eight epee ie' ,could not tolerate even the loweat ute of any· of the tu ..
herbicides., .More plants could tolerate CIPC thp I~z:l.ne and casoron.!
The datapre.ented in Table 2wo~i4 allow one to choose certain plants'
ofll,"r\tich o~~lIIQI'e of the ~J;'~f.cide. might be ~.dl!ucceuful1)' for
controlling weeds~ It 1& belleved, however, thAt' wide acceptall,Ce of
chemical weed control on these herbaceous ornamentals will depend upon
develop~ntof materiale. f~,,~~~olls or appl~o.Uo. techniques that
wUl be eafe for a wider variety of speciel.'
This work was perUafly supported by a grant from the Columbia
Southern Chemical COlIIPany.
53,
27
12
11
22
13
9
22
9
15