- ">! - 
StecTns ( 335 ) in l'^37 tested derris, ^ -Do^ands p«^r 100 gallons, vith 
1 po'md of ro?in repid\).e ss a sticker, in comparison vith lead, areena'^ e 
and other insscticides for the control of the plum curculio. From the 
standpoint of insect control alon'^, lead arsenate was unaueptionably the 
nopt effective. But if due consideration be given to eai-ally important 
factors, such as general foliage conditions and the size and finish of 
the peaches, there v;as tut a slight "balance, if any, in its favor. These 
results are significant in view of the increasing de^nand and the greater 
premium paid for fruit of high quality. 
Chp.pman ( 79) ii"^ 19!^? reported on control of the plum curculio in 
New York. This is probably the second iiost important insect pest of 
deciduous fruit trees in Kevr York. In a te<5t condiicted in 1^33, several 
trees sprayed vrith povrdered cube root, 2 pounds in 100 gallons of v;ater, 
showed considerable reduction in curculio in,^ury over control trees. 
Cube apparently inferior to lead arsenate and cryolite, ^'hich were also 
included in this experiment. 
Cylas fcrnicarius eleganti;lus (Summers), the sweetpotato v^eevil 
The Louisiana Agriculturrl Experiment Station ( 263 ) in 193^ reported 
th-'t derris dust containing 0.75 percent of rotenone vras less effective 
than cc.lci^im arsenate or cryolite in controlling the Gweetr>otato weevil 
on growing plants in the insectary. Wl-.en a"oplied directly to the potatoes, 
derris dust containing 1 or U percent of rotenone v/as e.oual to calcium 
arsenate or cryolite in effectiveness. 
Diorymercllus laevimargo Champ,, nn orchid weevil 
Hamilton ( 173 ) i''^ 193^ re-oorted teste; to control the orchid weevil, 
Derris pov^der (3 percent of rotenone and 15 percent of total extractives) 
diluted with clay at 1:1 and also at 1:2 was less effective than dry 
Pyrocide (5 r)ercent of pyrethrins) at the same ' dilutions. P^'rethrum 
povrder (0.9 percent of pyrethrins) was more effecti^^e thrn derris powder 
(U percent of rotenone and I6 to 18 percent of total extractives) plus 
5 percent of D. H. S. ( a pine oil activating agent made by the Hercules 
Pov/der Company) , 
Echlnocnemus bipunctatus Roolofs 
1-eoton, 1 pound in from 36 to Uc inpt^rial gallons of water, kii "i fd 
all larvae: all adults were killed by 1 pound in 32 imperial gallons of 
water. — Institute of Physical and Chemical Research (220) in 1Q27. 
Hylobi^iF abiptls (L.) 
Tho-Tscn and Wichmand (V/l) in l'^^'^ re^^orted that in laboratory tt rt-^ 
against this species derris "nowder ■nro^'^'^d to b"" usel'^ss. 
Hype ra ^ostica (G-yll.), - the alfalfa weo^ii 
Hamlin, in type'-'rit ten quarterly reports to the D-ivision of ^eroal and 
Forage Insect Investigations of the Bureau, in 1938 reported tests made 
at Hedford, Greg* ^ by R. W. Burn and R. C, Fewton, with insecticid.-s for 
the control of the alfalfa weevil. Roteno r Syrays and dusts had consider- 
able effectiveness against tho Inrvao. In July 1939 he reported compar?tlv«> 
