- 6o - 
Typophorus viridicyaneus (Crotch), a sweetpotato leaf "beetle 
Brar.non (_^) reported in I936 that cryolite-talc dust (60:Uo) was 
more toxic to the sv/eetpotato leaf "beetle adults in field-cage tests than 
were derris or cu^be-root mixtures containing 0.? percent of rotenone or 
derris-root sprays containing 0.02 percent of rotenone. The same author 
(Ul) in 1937 reported that the sweetpotato leaf beetle had developed into 
a pest of -distinct importance in n-rtheastern North Carolina. Results of 
cage toxicity experiments demonstrated that undiluted calciujn arsenate was 
more toxic to the insect than v;as a derris- or cube-dust mixture containing 
0.5 percent of rotenone or a v;ator suspension of grotmd derris root contain 
ing 0,02 percent of rotenone. 
C. L, Smith ( 3^9 ) i^ 1*^37 rcportf^d the following results against 
the sweetpotato "beetle: 
Matc-:rial Ra duct ion 
Larva n Adults 
s rc^-nt Fore ^~' riT" 
Derris pov/der (U percent rotenon^v)' 
3 l"bs + 1-T/S lbs. cocoBut-oil 
soap (anhydrous basis) vr 100 gal. 81 89 
McCormick' s dust, 0.75 pc'rcnt 
rotonono 79 §9 
Eraiinon (U5) in I932 reported the r^^sults of toxicity tests in 
cages, which indicatnd that undiluted calciiom arsenate, 20 p'^rcont barium 
fluosilicate 1 part with infusorial r-arth 2 parts by vreight , and synth-^tic 
cryolite 3 parts vrith talc 2 parts are highly toxic to the adult sweet- 
potato leai beetle. These matr-rials w<^re mere toxic than wore drrris or 
cube dusts containing 0.5 percent of rotenone, or a water suspension of 
ground derris root at a dosage cauivalent to U pounds of derris of U 
percent rotenone content in 100 gallons of v/ater (rotenone content of spray 
0.02 percent). 
Wa.llacea palmarum G-estro 
According to ,a' cojnmunl««s.tion fron P. DnkJc^is, Buitenzorg Botanical 
G-prden, this species, which lives in the heart of palms was svccessfully 
controlled by dusting derris powder (2 pi rcent of rotenone) into the heart 
of the infested plants. Satisfactory result^: could probably be obtained 
with a powder of lower rotenone content. — "^/-^n der Vecht ( Uoi ) in IQ'^6, 
Chrysomelidae (unidentified spp.), flea beetles 
In 193^ Cory ( 338 ) led a discussion of fit-Id results with arsenical 
substitutes for the control of veg'^table insectn. According to H.-^adlee 
(l£j) in 1935, flea bpctlee in plant beds can be controllpd by derris dust. 
McCampboll ( 26U ) in IO3I1. recommended derris dust for, the control of 
flea bertles en cabbage , 
