-~g6 -- 
Anth'onomu'^ eugcnii *^no, the- pep-oer weevil ■ ' ; ' 
R. E. Campbell, of the AlhamlDra, Calif., lalDor-tory, in a type-' 
v/ritt-^n report to thr Division' of Truck Crop and G-ard'en Insf^cts of 
the U. S. Bureau of Entomology and Plant Q;unrantine, 'in 193'+ stated 
that in cpg? tepts derris dust killed 51 P<~-^'cent of pepper Wo'fvils, 
as compar<^'d Vith 5^ percent for;;.cuD-o' dust. Both dusts contained 1 
percent of rotr-none-. A derri?' dust contain.^ng 2 percent of totenonc- 
killed 63 percent of the weevils. 
Anthbnomus grandis ' Boh, ,■ the boll weevil 
Snith, Clark', and" Scalr?- of the Tallulah^" La., laboratory, in a 
tj'pewritten report to the Division of- Cotton' Inject Investigations of 
thf Bureau of Entomcl'^gy and Plant Quarantine in 193^, compared the 
effectiveness of derris, cube, and other •insecticides' against, the. boll 
vreevil in cage tests. Derris and cube containing U percent of rotenonc, 
and derris mixed with cl*ay, '-sulfur, tobacco dust, and lime to 2-, 1-, 
and 1/2-percent rotenone content were used. The dcrris-sulfur mixtures 
vrere considerably bettrr than those with -the same proportion of lime, 
but in all cases the mortalities vrere low with 1- or i/2-pRrcent rotenone. 
The results with the undiluted cube arid derri^ as compared with calcium 
arsenate were as' follows: ' ' • ,■ 
Insecticide (applied as a dust — • 
"average field dusting" with a small 
hand dusj:. gun) ' " - 
Mortality 
' ■ ■ Percent 
Cube (U*^ rotenone) 75,0 
Dorris {hfo rotenoue) 91.6 
■€^3.1cium arsenate 81,8 
Sheck • ' . . ■■ 72.8 ' 
As shown in the table, cube was not eoual to derris of eaual 
rotenone content in killin::,: these insects. 
Gaines, Young, ^nd Garrison ( 153 ) in I935 reported field tests 
made at Tallulah, La.' The average yield"?' of cotton treated with 'derris 
diluted with sulfur to 0.5 and 1.0 percent of rotenone indicated that 
tli^esr- mixtures h'^d little if sny v-^lue for the control of the boll weevil, 
S.iith, Clark, ?.nd Sc-^les (j^fl) in IP36 reported the results of 
csge toxicity tests made at Tallulah, La.- Derri?? containing h percent 
of rotenone kill^ed' 69 percent of the boll weevils as cbmpar'^d with 60 
percent with calcium arsenate; but vrien diluted with sulfur or kaolin 
t6 2 percent, 1 percent, or 0.^ percent rotenone contf~-nt, the kill w_aa 
greatly reduced '^nd was not comparnblr- with that from calcium, arsenate. 
Smith and Scales, in a t^rpewritt<^'n report to -th^' D'-^ri^ion, reported the 
following result?; of cagp trsts made at Tallulah, La., during 193^5 
