C. L. Snith ( 3'^9 ) in 1937 report?! th?t derris powier (U percent 
-^f rot '^n-^np) 2 r>ounds v.^r 100 gallons; of water plus 2.5 pound? of coconut 
oil ^rr-n (anhydrou-^ ."ba^is) reduced the population of potato flea beetles 
on to'^.ato vlpT.t-B SB percent af ter. 2V- h'^urs. McCornick'p dust (0.75 per- 
cent of rotenone) reduced thf=^ population 87 percent. 
Walker (Uo6) in 1937 reported that Ultrawet at 1:1,000 enhanced 
the control of the potato flea "bpetl^ vhen added to derri<?-clay dust 
(0.75 percent of rotenone) from 59,3 to S2. 2-percent reducti-^n, and at 
1:1, 600. it rai-5r-d th^-.eff ^cti-'-pnes': of cute spra^', 3 pounds p^r 100 ^rallom 
of vrpt^r, fro-^ ^9*6 to. 76.S-percent reduction. 
T'lf- Connecticut. A rricultural Eyperi-^ent Station (S^) in 1938 
reporter., th-" re<3ultp of tests to control the potnto flea "beetle on Irish 
Coooler potatoes. Results indie? ted (l) th?t cute dust (0,75 peroent of 
roten'^ne) vraf more effective than cube spray, 1 pound pure groi.ind cute 
rrot (^ -nprcr-nt of rotenone) in 25 gallons of water; (2) that cute dust 
0.75 perc^-nt of rotenone) was mor^ effective than tarium fluosilicate 
dust 1 p^rt oariu'i. fluosilicate and U parts hydrat^d lime: and (3) that 
thp addition of o r)rtroleura-sulfonate srirendpr, Ultravret, to cute dust 
at the rate of 1 part i-^. 1,000 ^arts of dust increased th*^ eff ecti-"-en<' ss 
and reduced the amount of feeding ty flea beetles, 
Dunlap and Turner (106) in 193^ r^-'ci) Tin ended a dust containing 0.75 
percent of rotenone at the r?ti^- of 20 pounds v^r acre for the control of 
flea tr-etlee on eA"?.plant end the potato flea teetle on tomatoes, 
Thp Mapsachusett<5 A.^-ri cultural Experiment Station ( 27S ) in 193^ 
reported on thr results of exp'Oriments for thr? control of flea beetles on 
potatoes. In the exp'''rimental T^ots different insecticides were tested on 
'the standard late-season variety, &reen Mov.ntain, Tvrelve applications of 
tordeeuy mixture w«re made between June 10 and Aut-nist 27. Two rotenn::e 
compounds, nicotine tanna.te, a pyrethrujii extract, and calciixm arsi^^nate 
were tested in combination with 5-5-50 and 5-3-50 bordeaux mixture in the 
a'^'pli cations from July 9 t^ August 12. The rankin.^- of the different mat<^rial 
on the basi"? of flea, beetle control v^a.q as follf^ws: 
With 5-5-50 bordeaux 
With 5-3-50 bordeaux 
Material 
Avera.?e 
punctures P'^r 
leaf clust-r 
Material 
Average 
punctures "oer 
leaf cluster 
Cubor (roterone) 
Derris (rotpi.one) 
Ca.lciun arsenate 
lUcotine tsnnate 
C '-. e ck ( b 6 r d e au r n 1 ; 
DX (pyrethrum) 
Numbe r 
306 
^26 
7Ul" 
U3^ 
') Ugg 
520 
Derris 
Cubor 
Ficotiiie tai-nate 
DX 
Calcium arsf^nate 
Check (bordeaur only) 
Numb-r 
192 
231 
302 
333 
^^U 
355 
In bot''~ combinati'^ns tj^e rotmone? wrrf about eoually eff.-ctive ond 
decidedly ahead of all otV r tres'tments. Both were much more effective in 
the low-calcium bordeaux. ■ Calcium arsenate gave f^qually good protection in 
both combination^. Nicotine t.annate sh-wrd to better advantage with 5-3"50 
bordeaux, and thn offectiveno.??? o,f dx, the -nyrethrum extract, was greatly 
increased in this c'^ "itiiiation. Thr fact that all the material'^ gave tetter 
control vrltb th^ 5-'^-50 bordeauv vrould indicate that their action m.ay bp 
somevrhat inhibited by th^" excess lime of thp 5-5-50 combination. 
