-100- 
Phyllobiu? oblongu? ig rr^'^i^'.tAnt to derri?, p.nd P. p.j-ri cf^.n "be 
control Ird "by r dupt contpining 0.75 percf^nt of rot-^nrn?. — Anonymouf? 
(2) in 1037, 
Pipsodpp ptro"bi (Prck), t"'-o v^hitn pinr v^pvil 
Pott-, (321. .722) in IQ37 and 1038 ror^ortpd comploto control of the 
white pine weevil in an artificially infected tree "by n p-oray of dr-rris 
rcpins, and in Aug\ist 193^ stated that in sp-'eral Rra?ll plot-, treatrd with 
'nirturrc^ c ntaining lead arsenate , derris, dcrris resinatc, cryolitr, and 
f rr p nicotinr in oil, dcrrip gavr the nio<=t promising result^ against thi? 
species, ■ ' ■ 
Rhinoncus pericarpius (I.) 
-5r--. 
Katsumata and Murae ( 235 ) ii"^ 1930/^^Ported deri-i-s spray with r^oap to 
"be effective for the control of this weeril attacking hemp in Japan. 
Rh ^ ynchrienus salicis- (L'. ) 
Rotenone-talc dust (0.15 percent of rotoiion'0)killed JiO percent of 
( Orchestes ) Phynchaenus sal ici s (L.) S days after application in a dusting 
bell jar. — Trappmann' s.nd Intsche ( 375 ) in 1935. 
Bjaynchites aeneoviren? ah. minutup Hhst. 
Derris spr^y was ineffective. — Spoon ( 752 ) in 1933* 
Rh^'nchitea ajouatus (L,), an apple fruit rhynchites, or arple fruit weevil 
P. coeruleus (Deg, ) , an 8.pple twig cutter 
The East Mailing Research Station ( 112 ) in 1^3^^ reported that ^although 
experimental vrcrk has not "been carried out on the control of the apple fruit 
rhynchites, it is known that the application of a single derris dust \irill 
destroy this insect. It should he applied ahout 2 v^eeks after petal fall, 
or as soon a? the d^^mage is detected on' the fruitlets, 
I'iassee ( 280) in 1937 reported that the application of a derris dust 
seems to "be a foolproof remedy against the apple friiit rhynchites, "but 
that it mV'-st he applied soon aftf^r petal fall, or mMch of the dama-TO will 
ha.ve "been done. Should the infestation he very severe, more than one ap-nlic- 
ation may prove necessary. 
Jary and Austin (226) in 1938 reported that during 1^37 a good deal 
of fruit marking was caused hy the apple fruit weevil, R- ly n ch i t e s a. e q ua t n s , 
and thfit both in Kent and in Surrey the apiole twig cutter, Rhyiichitcs . co^'ru- 
leus , was serious on young trees. Derris dusts or spr'^ys appear to control 
both these weevils effecti^'ely. 
V 
Rhynchites hp'ros Rocl, 
Neoton, 1 pov.nd in Uo imperial gallons of water, was effective agninst 
the adults. — Instilutr. of Physicpl and Chemical -ttcscarch (220) in 1927. 
