- 31 - 
Rotrnr.p_f. q-ori' '« t dusts (0.75 porcr-nt of rotenonr-) vropc- rpcci'-K^ndod 
t:' Par>?= anc. Piprctorff (312) in 1Q72,' 
A duflt prepared v/ith talc a? a diluent and containin,;2- 0.75 pfrc^^nt 
of rotcn-^no has t,'iven sati^fact'^r.v control of the strirrd cucu'n'b*=r "beotlp 
and niaj' ue usrd inptfad ^f thr gj^.'S "•-■'Jn or t?lc-calciun arsrnate fixture 
if ..esirrd.— CrosDy, Chupp, and Lc-iby (^) in IQ30. 
Dust with cuIk? '^r derris (l r)?rc'?nt rotr>none) at the- rat? nf 15 
to 30 pounds per acr'--. Do r.^t '^iT ^"iV- sulfur. — Haude ( I8I ) in 1939. 
G. D. J-,nos (2^) reports- d in 1939 thr>t rctenone dusts had gi\T-n 
prcmis ng rf-sults for the control '^f striped cucunibrr 'b.eptlr in Missoiiri, 
Thf na°sachusptts A-Tricultural Experiuent Stati-n ( 279 ) in 1^39 
reported trots to control thp stri^'^d cucumlDor ceetle. Records 'if the 
(^ffecti-"-enr PS of insecticides were tpken "by counting the nwn"ber of "beotles 
present ,1vipt "brfore sprp^ing or dustin^^ and again 2h h^^urs after treatTipnt. 
Cuue-cla." dust containing 0.75 percent of rotenone reduced the "boetles? 
93.- T)erce^t throiAghout the period and gave the "best pr^tecti^n. CuTdo- 
clay dust (.o6'percent of rotenone), cooper oxychloride-line dust 1:1^+ 
(DuPont), coppor-rotenone dust (0.8 percent of rotenone), and calcium 
arsenate-line dtast iJlU all gave 90 to 92 percent of protection. Microniz ^d 
rotenor.p-sulfur dust (0.75 Percent r-^tenone and 20 perc^-nt sulfur) was 
the- least eff^cti-e of the dusts used. Wettalle cu'be and derris sprays 
(U poimds in 100 gallons) g?.ve 83.^- and SU.U percent protect i'^n and were 
sli.^.tly inferior t^ the dusts. T-e effectiveness of all the treatments 
is within the r^v.rc ^f eyoeri-iental error, indicating that the calcium 
arscnate-lime dust, which is the chea-r-est, vras the most "oractical undpr 
193s conditions. 
Beard (22) i^ 19^0 wrote th^t for the control of this species a 
derris dust containing 0.6 percent of rotenone is to "1 e recommended over 
other treatments,, "because this m.aterial 8er-"-es not only as a repellent 
liut as I'^th a sto-iach and a contact poison, 
Dia'Protica spp., cucumber beetles 
Howard, Mason, and Davidson ( 200 ) in 19"'i5 reported that derris 
had b'' en tested against cucumber beetles, , but in rirrrv instance the infesta- 
tion vras too light to afford conclusions, 
Derris was off ^"cti-.-c in field demonstrations, — New Jer':'ey Atricultural 
Experiment Station (296 ) in 1Q75. 
Da-^is (99) in I936 reported results by G-ould, of the Purdue University 
^griculturol Exreriient Stati-n, wito copper compounds, arsenicf'ls, fluorine 
compounds, nicotine, and derris against the cucumber bo-etle and wilt. The 
best material (a mixture '^f calcium arsenate and copper oxychloride) , dorris, 
and no treatmpnt comT'ar.^d as follows: 
