- 29 - 
Bs^.vA (26_) in 1937 rf^io-rt ^-'. t--«t'"r nfjBin.^t the ctri-^'^';": cucn^-.b^r 
-w:eptle in Connectic^i.t. Pottpr. ssouash r^lant* wr-re i;.ged f'-'r fo^^d natr-ripl 
and Wf-rr- b^'"»'rf'd "c^ co;pi-,,--r-wi.re-«!crppn c?.gf;<5, Br-^'tles w«rc intr'^dr.c*=d 
into the ca{'e<! p.nd thf- irxP-cticid'^s a,i^^liod thron.ch thp vrir? pcrr-en, 
ii'T. inp''ctici".pp v rr- trird^ ap follovr<?: 
Derris dust: C'-nto.inin.: 0.6 percent of rot^n^no (derris 
root diluted i^^ith clar). 
Derrifi ti-^'T^yi Grounl di^rri* r^ot u^ed at a dilution of 
1:200 with SS-7 s-rcader at a dilution of 
l:l,600. 
Rotenone n-or.".": a co ii-iercipl "nrodn.ct ''f cu.''je root, C'ntain- 
inr 2,5 riercent of rot-'-n'^ne , unrd at ? dilu.tion 
of 'l:200. 
Calciun arsenate: One ---art diluted vrith 9 oart? of gT'JU'n. 
Pyret^rj.-i. du^t: A concentrated -^^^rethruu du.pt containing 2 
pf-rcent f^f '-.,vrethrin'3 diluted vith talc ItQ. 
Beetles w^rr also car:ed ov^r untroated -olant* to 9erv<^ a? s check, 
Tweiity-fcur hour'? a" tor the inpectici ".es vrere ao-pJied, coimte w^re n^jde 
ti^ dcternine the killing -oovrcr*! of the duatp and snra,\-«5. The results o"b- 
tained are as follows: 
iDrf-^t'nent 
ToRtp 
Bcptlep 
Beetles 
killed 
NuuT^er 
ITu^lDer 
ITuuher 
F-rc^nt 
Derris dust 
u 
70 
70 
100.0 
Dcrrip sT^ray 
3 
hi 
U6 
97.9 
Conncrcial r'^ten'-'r.e s^rey 
(deriV'^d from cnhe) 
3 
5S 
39 
67.2 
Calci^i.Ti arsi^nate 
2 
Uo 
18 
U5.0 
P-Tethru"! dupt 
"1 
3S 
38 
100.0 
C-eck 
1+ 
87 
1 
1.1 
Derria was also the T^^t ^-ff-^'cti"? inf^r- cticide when -opetlep were 
introduced into the cas<"B 5 dp,7<* after spraying or dustine. In a Vlock 
of Hu"b'ij?r'. sauash, one-half of the plants vrr-ro treatpv". with derris dust 
and one— half with cu'be dust, also C'^ntP-ining 0.6 'oorcent --'f rotenone. 
The killing action was in^^ediat -■ in "both caprp, Freu t'lepe tests it 
may te concluded thf-t dorris dust, containing 0.6 percent of rotenone, 
Ib the ino«?t eff'^cti'"T tre^tuent .'^.■:;ainst the striped cucuuter h^^etle and 
is to ■':e r^eff^rred to the calciu.-^ pr<!onatp, which heretof.'^r'^ has "be^n the 
standard recon lendation of this ptati-^n. Roark ( 327 ) in 1938, in co^rarlng 
the rel^ti-"'' effoctivon^ ss of d^rrip '-nd cu''>^, referred to this w-^rk cf 
B*»ard. 
Bourne Did Boyd (^) '^f the Masspchus^'^tts Ext^'nsi*'n Srr-^ic^, in 
1937, Ti co'Tir-ndi'd that w]:<>n octles fir<^t ap*^e.">r a dust cnt^^ining at 
lea-'t 0,5 ■P'-rcrnt of r^t^'-non'^ "oc a'^.plird. 
