- 27 - 
Brittor. (_^) in 1938 ncl"i?^''. a corrfs^ondent tr s^ray with onr^ 
of tho cc'.i^..-rcial -■r''"?r''^tion<? c -it?iir-ii-g roton-r.f' or -orTi^thrum, nr-ith'r 
of which ip l':r.'->wn to discolor tho flowr^r^^ for thf^ control of th--^ s^ottPd 
cucun"b'~r D-'^tl?«' on dahli? olo<?so-i.e. 
For control of th-- s-cnd-jener^'ti'^n 'b'-ctlee a d^rri" dust (l p'r- 
cf-nt of rotenonp) sho-.-.ld Ir a^.i^li'd ot l^^pt twic' ^ vp-'- frr o, nrrnth,. — 
Gundr^rs-n ( .l6g ) in I93S. 
Par'^rs i^nd Pi,-:rf=5torff (212) in 193? rccon-ionded roton'-n* sor^rs 
(U pounds of U pr-rcent powd-r [O^r 100 gallons) or vdust^; (0.75 "^'^reent 
of rotenone). 
DerriP-t^lc du«?t (0.75 r-rrcrnt of rcte-none) will heir to rfi^-.cc 
the nuntr-r of b--etlr-s. — CropL;-, ^hurp, ..and Lei^oy (92) in 1939. 
Du-^t with cu"u^ or -.'Tri?? (l rorcent of rotp-none) at th-^ ra*'= of 
15 to ;^G T^oundR r-r acre:. Do n-t -ix with Fulfur.— H?.u-> ( 181 ) in 1^39. 
DipTjrot j c^ soro r Loc., thr- w-. o.f.rn pr.ottrd cuc-irao'-^r "^jp-otlr 
Mot- and Thoros'-n (200) in 19^^^ r'"port--d th^t ^ derri<5 pytr^ct 
prcT'r-d inferior to pyrethrun extrp.ct vfhrn tp??tP'd for the control of 
t^.ip RT-p-ciep ^n c^nnin;- oe^^'ne under fif^ld condition? in Or^g^n. 
P-ockwood (329) in 193^ roportrd that a derri?-infufsoria.l-oarth 
v^.uist (1.25 riprcent of r^tononc) w--. = r-ff .-^cti^e against thapo "boptle.R on 
fencp pof^t?', Thp mean te^nr^-raturo for the 3 days follov;inn' tho duo.tin^ 
vrna ^3.5^ ^. , with a naxi.nm.'n of 50° and a ninimm of 38^, Thare wara 
light rains totaling 0.77 inch. Yqt}' f -w living "bef'tlep war? foimd ^n 
or near tha dusted pogt^. Th^t this dust was lethal to L. soror at I'^w 
temparaturas was sh^-wn "by a laboratory erpo-ri^ant on Janurr.'.'- 29, whan 
20 D. soror ■battles, collectf'd ^n January 20 and fed alfalfa and' Austrian 
peas, Wf-:re ah^^'rcn up in a paper cart'^n with a pinch of the dust as usad 
in the field. Thrr v--v thon r^lo.cr-d in a clean carton with gre-^n f'^^d, 
Thi? carton nnd si-^ilpr -nes cont^iini --.g undustad hortl^r; wore Va-pt in ^n 
unheatrd roon (UO-50'^ P.), All bxit 3 of those -oeetlF.!? died within 21 hours 
(most of than in 3 horn""). The othar 3 vare able to mo--a their a.-n-oandag^q 
when ta.kan into ? vrarn room. All wore -^ead within U5 ho^ur^. IJona of the 
loo undnpt^d battles di^d during this p<^riod. 
%o Oregon Agricultural Ex-orri-n-^nt Station ( ^lO ) in 1937 r'='T)ortad 
that the bean leaf baetlf or w^'st'rn twelvo-spottrd cucu'^brr bottle (D, 
soror ) did not occur on beans in the su.nner of 193^ in '^uffic^ont n'\'nbf--rR 
e^ th- t additional information on control could be obtained, although a 
few prrlininar.,' teste with a derris dust showrd it to b-" of value in kill- 
ing tho b.-ctles with which it ca-ne in contact. In 19'^5 tests sh'^w^d th^t 
rotenone-bearing dusts dilutc^d to c-ntain Icr-s tVian 1 ^^rcent -^f rotan-^ne 
did n^t kill th<- br.rtles. 
Diab r otica tr i^'itta ta (Mann.), thr vrr-rfrn st^^ir>.->d cucu'nb-^r brrtle 
McKinnr-y (2§^) in I936 rerjortod th-at the applies ti-n of dust 
nlxtn.ret! containing 1 percent of rotanone, derived fr^m darri'- or cub", 
vrith talc as a dilur-nt prorod pffrcti"-e in c^ntr-^lling tho wi-ptorn ptri"o.->d 
