Thp Ma<=s3chusPtts A.fricnlt'iral E-p^ri-^r.r.t Station (275) ir. 1935 
rr-port--d t--t a.^rainst flpa ber-tle? all the rotcnone riro:^.ucts (CulDor, 
Ku'bntor, and "R^i. Arro^'O ga'^p eTCPllent protrctior.. T^f^y arp^^r'^d to 
exort a consi'^.erable repr-llfnt eff'^ct, in addition to their dirr-ct 
killing action. Thp spray 55 wrr^ f?lightly supt^rior to thP diastp. The- 
pyrothruv. dust was offocti"P for a- sho-rt ti:i.o aftrr a-pr>lic?tion, "but 
appeared to have very littlr- residual offset. Excellent yields were 
obtained in all th*^- plot??, particularly in those where rotenonc compounds 
had te.^n ap'-'lied. The yield record of th*^ diff^re^nt plots is as follows: 
Material 
Bordeaux 5-5-50 added in all Yield 
a-.olicrtions) [ •':~r acre 
Bushels 
Cu'tor spra" (rotenone) 6U7.99 
Cubor dust (rotpnone) 579.00 
Kubator' spray .(rotenone) 573-T5 
Kutatox dust (roten-ne) bOl.l? 
Fyr-thnu' dust U39.57 
Calciun arsrnate-arsenit^ -r.ixtur- 519.12 
Bordeaux -nixtur? only 5^0. 30 
VTar^-r and Anderson ( U08 ) in 1935 reported that very high kills 
of the potato flea beetle v;ere obtained with derris dusts containing 
0.5 percent of rotenone, but only slight increases in yield were obtained 
by dustinf; hea-^-ily infected potato plants with as many as six apiolic^ti'^ns 
at 7 - 10-day inter^-als. 
Herman and Hockey ( lg5 ) in I936 re-oorted Cubor 75 iiist(0.75 
percent of rotr-n^ne) and derris-f,"ypsuTi dust (O.U percent of roteni^ne) 
effecti-e a.-sainst potato flea beetle? on ton-oto plants. 
The Massachusetts A;..-ri cultural Experi-nent Station ( 276 ) in I936 
reported field tests against potr-to fle^^ beetles vrith th'^ rotenrne prepa- 
re? t ions Cubor, Kubatox, and Dorrisol, All were co'ibined with a 5-5-50 
bordea^ix Mixture, rnd lU np-o] icnti'-ne were nrd-f at 1-d.^.y intervals, fro'n 
June 13 to Sr-'te-^.ber 11, All test's wer'='- cond^^cted on the standard variety, 
&r~'"n Mount=iin. The rjlants in the unsr^rayed check plots were badl:' riddlc'd 
by flea b^'etles and browned by Icafhoppers, rnd were -t-ractically all dead 
by the I'Ost of July. The plantr, in the sprayed plots w<=--re thrifty and 
jT^rern untilkillofi_ -jy frcst on October 9- The -^Jisprayed checks yielded 
179 bushels per acre, whf^rea? the a'"'erae;e yi'eld in the s'erayed -nlrits was 
ovrr '-30 bushels p'-r acre. Laboratory t'^sts on the rffect f^f the various 
sTorays ur>on flcfi beetles t-^-vr thr follcwin.^ result c: 
Material Mortality 
Uo hours 62 h'^urs 
Bordeaux fixture 5-5'-50 
Kubatox * bordea^ix 5-5-50 
Cubor + bordeaux 5-5-50 
Derrisol + bordeaux 5-5-50 
Calci'iM arisenat' + bordeaux 
5-5-50 
Bariu:^. fluosilicate + bordeaux 
5-5-50 
Ferment Percrnt 
u 
80 
33 
100 
33 
100 
7^ 
95 
30 
75 
2^ 
55 
