- 2U - 
C. L, Smith ( 330 ) in 1937 reported tr-st'? of dt-rris <?prayR again<;t 
spvt^ral spccios of i.is'cts. Small-plot tests wer.^ mpde ?.nd thf=^ derri<^ 
powder (90 to 95 p^rcent^ prising n 200-mv^sh pie-^e, rotpnone U percc^nt) 
plus a Uo-percent coconut-oil soap was applied with a knapsack ?praypr, 
A spra^ contrining derri? ponder ^t th'? r?.tr of 2 pounds p'^r IGO gallons 
of \«ratf-r plus U pounds 11 ounces of sodp reduced the population of adult 
aspp.ra&up hfi-tles 83 percr-nt^ 2U h-urs after ppplic'^tion. 
T'l.is pest on asparagus was killed by a product containing 12 per- 
cent of povrdered LonchocrrT>us hicou root (6 percent rot-none content) and 
S8 percent of trlcun"! according to ? letirr from Et? blissernents Rot.'^nia to 
R. C. Roark in I938, 
Dust vrr-'^kly during th-'^ growing and cutting saason with a dnrris 
flour (or g^nosuin^ pr-arl dust, or r^ulfur) dur-t containing 2 pr^rcent of 
rotrnonc. — Gunderson ( l6g ) in I93S, 
Leih.;' ( 25^) issU'-d instruction^^ in 193S for p'-v^r^.^xi''. "b-^i^tle control 
vrith derris spr^.^^ p.n('. derris dust, A satisf actor.;'' derri? spr-'^y is prepared 
"by mixing 3 ounces of derris powdor (containing U or 5 ^erc^nt of rotenone) 
in h gallons of V/ater to which should "be ad'.ed as a sticker 2,5 ounces of 
skim milk povrder previously mixed in a small nuantity of wnter. A satis- 
factory derris d\?.st consists of a mixture of 1 pound of derris (contain- 
ing U or 5 percent of rotenone) and 6 pounds of clay or talc. Better ad- 
hesiveness is obtained if the dust is applied when the -nlants pre wot with 
de\»r. Dust or sprpy ?ppli cations should "be made wh'^never they are thought 
necessfiry. They are often most advisable vrhen the second brood of beetlas 
and their slugs appear, vhich is during July and early in August. 
Rotenone sprpy was re cor^i ended by Parks and Pier=:torff (jl2) of the 
Chio Extension Ser-^ice in IQ3S. 
The South Carolina Agricultural E>-r)eriment Station (j5l) in IQ^S 
reported the results of tests of se-^-pr^l insectici es on the asparagus 
beetle in O.l-acre plots. Against the adults a dust containing 3»5 "^^rcent 
of cub'- recins, 73 percent of siilfur, and 23.5 percent of diluent ranked 
first in eff ectivenes-^ , but was inferior to calciuJti arsenate against the 
larvae, Car:,e expt-riments were cond^icted to determine the effectiveness 
of vrrious conccntr'- tions of rotenone against a.dults. The maxi'riixm, mini- 
mum, and average mortality of adult a-^p? r.ag^.xs beetles aft'--r ^8 hoii.rs' ex- 
X>osure to plants treated v'ith various dilutions of rotenone derived from 
cube and applied as a dust ^ire shown in the following table. 
""iortalitv 
R ote;Tnne coi '-tent (T"rce".t) ' Maximum A '^'' erage ; Min imum 
r'-^rc:- -t P-'-rcf- '-t Perc' nt 
1.00 96..O 91,5 87.0 
1.75 96.0 91.6 7S.3 
,50 92,0 80.2 65.3 
.25 52.0 U2,2 3^,8 
.10 Uo.o ^6.U 2i;7 
