~ 26 - 
PiaDrotica br.ltef'ta Lpc., thr oanAec. ciicun"bi r "br-r-tle 
i-^cKiMrie:' ( 267 ) in. 1935 rrport-d t-^ct-^ '-'ith derris dust ag?.in<=t 
cucuTTilDf^r iDPetle.? pt ?'-r-cr.ix, Ariz. Tho direct aioplic-tinn of a derrig- 
talc dupt mixture containing 1 percent of rotenone kill^^d from g6.1 to 
99. g percent of the adult oortles. The "beetle'? were collected oy the 
sweep-net method from wild gourd vines on the desert. They vrere lihpr- 
ated within a screened enclosure ?.nvd wer'^^ treated with the dust mixture 
af t-^r thsy had settled on the screen. Judging from the results ohtained, 
it see-As possihle th?t derris dust niixtures containing ppr.roxi^ptely 1 
percent of rotenone sh-^uld pro-^e ver,y effective when ariplied directly to 
cucumher hoetle adult'^, Th«" s'oecies invol'o'ed in these tests were the 
striped cucunh'^r oretle ( Piahrotics vittata (F.)) the spotted cucumber 
"beetle (D. duodecimpij.nctata (F.))^ and the "banded cucuii"bf^r "beetle (D, 
"bait eat? Lee.) . 
I:; 1936 Mcl^innp.y ( 26g ) re^^orted that preliminary cag*^ and field 
tests at Phf-.onix indicat-d that roten'^nn— containing insecticides ar'^ 
more toxic t^ the striped c^icim'b'T "beetle and the handed cucum"ber "beetle 
than to thr spott'd cucum"b--r "be^tl^. In the course '-'f experiments canta- 
loups ^ cuctimhers, and w?tfrmelon«5 infected "by the thrp-^- species of "be^^tles 
vrere treated with a dust mixture of derris and cu"be containing 1 pprc'=^nt 
of rotenone J vrith talc as a diluent. It was shown that, under conditii^ns 
existing in the Salt River Valley of Arizona., talc alone had some repell- 
ent effect on the thr'^e s^^ecies of "bef^tles invoP'-ed, In general the a^o-lic- 
ati'-.n of this dust mixture icept small watermelon ^-^ines in the fi'^ld frer 
from "beetles for ^^t least h devs. 
Pi a"bro t i ca^duo decimpunct at a (P,) the spottnd cucum"ber "beetle 
See McKinney ( 267 ) under Dia'b'.^otica halt eat a Lee. on pages 26 and 28 
A susr^ension '^f roten-ne in water 1:20,000 killod n^^ne of the 
adults on potato in the fi? Id.— Da-.^idso-. (92) i- 1930. 
Darley ( 96 ) in 193^ sprayed adult spotted cucum"b^r h-^etles, con- 
finFd in small vrire-scrf'i^n cagf-s, viV'^ an aa'-^po^is sixs-f^nsi^n •^f rot'^none 
m.e.d'-- 'by adding ^ 2-r'ercent soluti-^n \r. .^cetonp to v^atr-r. Rotenone g.t 
1:1,000 killed 50 •-orc'--nt in 2U h^ur^^, 79 i-:'-'rcent in Ug hour''^ ond 91.9 
percent in 'f2 hours. Fenetrol wes a .ded t^ e^ch spra" at th" rotf' of 
1:200. 
Rotenon«= suspended in water 1:125 had n-^ effect ^n the adults. — 
Da^'-idson, reported by Campu-11 (66) in 1932. 
At th'-' 193^ meeting of the Xmeric.nn Association of Economic Ento- 
mologists, Cory ( ;^gg ) led p discussion of field results vrith arsenical 
substiturf-'S for the control of vegpf^hle insects. Hea"'.lep^ of ITf-^w Jer-^ey, 
in 1935 pu"blished a statement that the si-^otted cuciLmber "oe-Hle can he 
controlled ^ov derris dust. 
C. L. Smith ( ^39 ) in 1937 reioort d that a pt'ov^y of derris -oowder 
(k pprcf^nt of rotenone) at 2 pon.nds -or.r 100 gallons of wat^r plus 1- 7/g 
pounds of coconut-oil soap (anhydro^.s "basis) kill^'d <^7 "oerc^nt of spotted 
cucumher beetles on aouash "olnnts confined in cheesecloth cages 2^ h'^urs 
aft^r applicatf'^n. A l-p'-rcent derris d\iBt ga-"-e a kill of gg percent. 
