Sellke ( 333 ) in 193'^' reported th?.t derris dui?t, derri<^ attrsy^ 
derris plus pvrcthrurn c'.ust, and dp.rri? plus pjTcthrun pprav wore '^ffecti'"( 
p.faanst the- larvae and adultr, of the Colorado pota.to tcotle in tests in 
G-crmany. 
Demon <5traticns in controlling the Colorado potato lieetle on to^n-^toi 
v'ith rotenone dusts wero ?o favora'c'le that a mun'bi.^r of j-rrowers arc using 
that material in place --.f calcium arsonato, — Maryland University Sxt^nsioj 
Sprvice ( 27^ ) in 19^0. 
Longi tarsus 5Ut^.;r?llus (Marsh.) 
This flea beetle, foijjid on Crotalaria , is sensitivf:- t^ derris. 
IKistinf; and spraying with the a'bove-menti'-'nod concentrations gave conclus! 
results. Hov; frecucntly the treatment should "bo repeated in practice is 
still not known. Of Un "beetles, x^rhich were fed for 3 days on Crotalaria. 
leaves snra.yed -with derris r^owder in water (rotenone 1:2,000), 2o died in 
U days; the other 15 rema.ined alive for a consideraole tine, so that the 
action of derris as a. stomach -ooison is insufficient. Therefore, it is 
essential to contact- the CcetTes with the remed;y'. — Van der Vecht C^Ol) in 
1536. 
Longitarsus sp. 
X species which "oerforated the yonr.g leaves of -patchouly in the 
"Culture Garden" at Buitenzorg, Javo,, on bcin^ tested hy dusting vdth der: 
powder (la,leur) plus talc 1^3, died in a short tine. After thp planting 
was dusted with the povrder mixture "by a hand duster, only a very few "beet! 
were to be found on the plants the follow! n?; da.y. M'nen the dusting was n 
peated after 1 week the infestation -^ira.ctically disap^.eared. — Van. der Vec] 
"( Uoi ) in 10,36. 
Luperodes praeustus Motsch., a. clover loaf "beetle 
Tamanaki ( 365 ) in 1929 recommended spraying with derris to control 
the larvae of this species, 
ITo don 1 a pun cticollis (Sa,y), the rose leaf beetle 
Hamilton ( l72 ) in 1937,'' reported that N. puncticollis on hush hone, 
suckle was controlled Go percent "by a spra" of k pounds of derris ?r cube 
povfder (U percent of roton^ne) and U pounds of rosi -residue emulsion per 
l*"''; gallons of water. The spray acts as a repellent. The effecti^p porii 
is U to 6 days, Rer.eated spra"''s should a;ive satisfactory control. 
Pari a canella. (F.), a straw"oerry rootwoimi — 
Derris dust and derris extract, a-^>plied as abov(^-fi;ro-'ind treatments 
were inferior to, lead arsenate m.ixed with bench soil at the rate of 10 
pounds p(;r IpOO souare feet. — Fevr Jersey Apiricultiiral Experiment Station 
( 29^ ) in 1035. 
Brltton (56) in 193c recom.mended derri<=; dust for the control of th 
strawberr," rootvrorn feeding on the leaves of strawberry plants. 
