- 101 - 
Rhyr.chitea pauxillus G-er.'n. 
■ Satisfactorily controll»^d oy derris povrder "dIur soap s-oray. — De -^ussy 
et al. (61) in 1036. 
Rhynchites sp. 
Etatlipsementp Rotenir^, Ant^rrrp, Belgium, reported in a letter to R. 
C. Roark that thi? pept on plum trees was killed "by a product contain:^ ng 12 
percent of povrdcred LonchocarDUp nicou root (6 percent rotenone and 88 per- 
cent of talcum). 
Sitona lineata (l.) 
Unaffp'Cted oy derris powder plu<? soap ST)rny. — DeBuss:' ^t al.(6l); 
Van der Laan (252) in IQ36. 
Sitophilug grrnarius (L,), th- granary we~vil 
( Calendra ) Sitophilus grnnariu? (L.) is re<5i<5tant to d.erris po^^'der.--- 
Anon^-ranus (2_) in 1^3? • 
The adult i^ suscc'-^til)!'^- to derris but the effect is very slight. 
Craufurd-Benson (PO) in 19;^g. 
Sitophilug oryza (L.), the rice weevil ■ . 
Ter)hrogia candida seeds and Derris elliptica roots applied as dusts 
vfere not effective against ( Calandre ) . Sitophilus oryza (L.). — Bhatta and 
ITaranyana (2^) in 19?g. 
The adult is nnt susceoti^ble to derris. — Craufurd-Ben«;on (90) in IQ'^g. 
Sternechus paludatue Casey 
Douglass ( 105 ) in 19"^"^ report'^ d -thB.t Cutor dust and derris containing 
3 and 5 perrent of rotenone were not eff^cti-i'-e in killing tiis weevil. 
Sternochrtus la path! (L.), the poplar and vrillow bor-r 
( Cryp 1 rhyn chu s ) St'riiochetu<^ laT)athi (I.) is resistant to derris. — 
Anonymous (2_) in 1Q77. 
Tyloder^ia fragariae (Riley), the strawberry crown bor^r 
The Arkansas Aericu"' tural Experinent Station (21) in IP"^^ reported 
results of exDori'nents vrith stra^'berry plants. To get -nore definite date, 
stravrb'n;'/ plants were put In battery ,iars, thr bases of ■ the plants surrovmded 
with cotton, and a known number of crown borers put on each plant. The 
treatm>-nts included the -^ame mixtures used in the field oxperi'-ient", and in 
ac'.diti on derris dust (5 percent of rotonone) and calciuTi arsenate undilutc^d. 
Calcium arsenate and derris dust gave 58-percent control, lead arsenate 
35 percent, ^^nd sodiuni f l^iosilicate 7 percent. 
