- 105 - 
Epicp.utg' marginata (F. ) , the margined "blister 'bpotlp 
Diotz and Zoisort ( l03 )in 1P"^U r^portrd ln'bor'>tor:' tests of ingocticidcs 
agninst the mprgin?d "blister "beetle and the "black "blist-r "bcctli!. The insects, 
confined in small scr"<-n cages, were ioimers.^d in 1.5-P'"'rcrnt concentrations of 
the plant extracts vrhich had each been dispersed in a O.U percent of coconut- 
potrsh soap (containing Uq percent of soap on a dry-weight "basis). Af t<' r such 
immersion and vhcn all excess liquid had' drained from the thoroughly v;etted 
insects, they v/crc confined as before with frrsh goldenrod f lovers in .Icily 
tximblers. As long as the insects were wet they remained immobile, but movp- 
ment and recovery began as soon as they dried. The tot^^l mortality based on 
records taJcen at the end of Ug hours was as follows 5 
1-la.terial Active ingredient Beetles dead 
Percent 
Pyrethru.71 extrr-ct pyrothrins ,2.15 P' rcent 75 
Derris plant resin?, U,5 percent 
Ficotire (50 per- 
cent free base) 80 
These tests did not warrant further tests with more dilute application 
of these materi^'ls. 
Brannon ( 39 ) in I936 reported that the margined blister beetle on young 
Fordhook lima beans, grovn on the Eastern Shore of "\''irginia , was not controlled 
with derris dust (0.75 percent of rotenone) or a calci^om arsenate-sulfur-lime 
dust, but wnp controlled by the applicptipn of undiluted barium fluosilicate 
dust rt th- rate of 10 to 12 pounds per acre. 
Epicauta pennsylvaniea (Deg. ) , the black blister beetle 
See Dietz and Zoisert ( 103 ) under E. marginata (F.), on pagel05. 
Haude (181) in I939 recom-^.ended dusting v/ith cube or deri*is (0.5 percent 
of rotenone) for the control of the black blist- r beetle. 
Smith and Sullivan ( 3U0 ) in I9U0 reported that, in field test<^ on 
china asters, sprp:'s containing pyrethriim extracts (pyrethrins.'l.'lO, 000 
and 1:22,000) killed 68.8 and U2.6 percent of the black blister beetle, as 
compared with complete mortalities of cucumber beetles, the tarnished plant 
bug, and^the garden flea hopper, on the plants at the s?me time. Derris powder 
and derris extract (rotenone 1:18,000) when added to sprays contain! g pyreth- 
rins 1:10,000 did not increase the mortality, but wheri; added to sprays contain- 
ing pyrrthrins 1:5,000 a higher kill was obtained. The most effective spray 
vrf^^ one containinir pyrethrum extract (pyrethrins 1:5000) and derris powder 
(rotenone l:U,000), which killed 91;6 percent of the beetles. The derris powder 
used alone killed 11.1 percent of the b'^( ties. A sprender containing "Ikyl- 
phenylbenz.rnesulfonic ^cid was ade.rd at the rate of 2 gm. per gallon, 
Lytte stygice (Lee.), ^ blister "beetle 
An application of 1-percent-rotenone dust caused the inf-^rnal blister 
b^'-^tle (L. Btygica ) to disnppe.nr. No dead ones could be found; howev.^r, follow- 
ing the dust ampl ice t ion th'^ b* etles brcn-ie very excited and imnedia^ely t^ck 
flight for short distances. — L.G. S-^ith ( 3UU ) in 193'^, 
