Vol. 16—1962 - NorthEastern Weed Science Society

156
tbe .pring, 1-9.48. Tbe LSDat the S per centievel·.a. 1.69 end at tbe 1 'per
cent level, 12.28.,In ,fact, C1bebitueberry planta 1D'tb.plota treated in tbe
spring have"Jnot COllI"pletely recovere,d tbree ye.,ra deer'treat_nt as indicated
in Table 5. Tbe differences between year. or rate. of application were not
.ignificanll.'1'be,clrop. in per cent recovery in 1960 for the fall treatmenU
i. difficul' to explain.
Discus.ion
and Conclu.ion.
The dat~ preseoted show that tbe brake control following an application
of polyborc~orate per.i.ted over a period of tbree year. and that tbe control
w.. ,be~er::fo1lC1W1ns .pring. 'than fan appl1cad ... attwooftbe thr":
location •• On the otber hand, blueberry plant recovery following the 'fal~:
applications, was better than that witb spring applications.
, Both .,J,8IIlIlU1'It Of brake kill"~d blueberryidj~JtY were variable •. Tkl..
wa.. probablldue to difference. in,Talnfall, in soillt1P8 and depth, 01' £a;. '
.011 mo1stu~ at different locaUon.. Since wild JJ:lunerry plants grow'"
.eed, the c!lpaw' :an BClIlIetlllea'Iutte diUimUarand1ll&y vary in their",
.u.cepUbUi~ em reai.tance to. polyborcblorate inj\1l'1.')
Altbous~ .pring application of polyborcblorate reaults in better brake
control"itaj~e:at tbattime, ila qtaetUonable beca":~f injury to the blue-"
berry plants. However"inar •• , _ving .uc,b heavy lNIpIIl.t1ons of this weed
that harvest~ng of blueberries is difficult or impos'ible, .pring application.
of.p01,.,orchlOC'ate.would b. f.a.ible. In le~.4 tbe differenc,.,,"tft'
kUlbetweenl rate'.f400, 500,!lDd 600 pounds of pO~cbloTate wer.en~· .
• ignificant. le" than 400 pound. mey be enough for adequate brake control,
particularly for the .prins treatments. Thi. i. being inveatisated.
Literature
Cited
1. Balley, ,~obn S.'andW. J. Lord~ 1960. Conuol of th.common brake, 1',
Teridiumlaguilinum L., in lowbuah blueberries with p01yborchlorate.
Proc. l4tb Annual Meeting Nortbeastern Weed Control Conference. pp. 60-65 •
••• l,
2. Fi.ber a.d Yates. 1938. Statistical tables for biological, agricultural,
alld, mecll~al:Il.... rch. Ol1verandBeyd, Edtnburlb.
3. Snedecor, G. W. 1946. Statiatical method.. Collegiate Preas, Inc.,
Ames, I~a. SOb,ld,.
; !
r ,
I s,
t.'
Tbe p.olybol'chl«ate ua.4
__
in the..
"
.xperiment~ was !Juppciled by the PaCific,'
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