-36- 
^ri tor 
According to an anonymous/ (2) for the long A* t ° n ^»f^ < * t S ^"°?U l ^ 
ennuefopen day of , the University of Bristol Resea ,* t=Uo t I ^Ajht« 
-as held on May 6, 1937, the control of the pin* sa-fl «nft the red spide 
-as demonstrated by the use of combined sprays containing -hite-oil e.,.alsi 
and rotenone-conta.ining substances. 
Kearns and Martin (85) in 1938 recommended a spray con^talng 0.67 
gallon of actual oil and 1 pound of derris or ^oncnoternue ground root 
(rotenone 4 percent) to 100 gallons of rater for ^e cpntrol of the plua 
Ufly. One drenching application -4e ^efore the h ch n of-J^ 
the esrcs controls not only the olu-n sawfly hut also refl spin „ „, derect 
of Lonchocernus nicou ?ave a more potent combined spray t nan did tr.e pow 
root. 
The Nev Jersey Agricultural Diriment Station (n|) in 19S J '^fdded 
that derris or cube ponder in-eter to "W*.'"^"!^ "s^ut there 
killed the adults and young of several species ef spider mites, out 
did not seen- to be much kill of the eggs. 
' The b. Zealand Department of Scientific ^^^ZZ'teXToti in^ 
in 1940 reported that derris. ^^'J^^^^^^J^Z. 
various concentrations, gave only partial control 01 reo » - f 
Derris products of this type 'Cannot be regarded- es suitable substitute 
summer oil. 
Tyroclyphidae 
Caloqlyphus kramerii Berl. 
Mil. and Miles (105) in 1935 reported that dusting ^^*£ h ££ 
derris and pyrethrum dusts may give some relief ^ « **£* ** "** 
mites ( Caloglyphus kramerii Berl. is the most, common) is sevoia 
T yroglynhus longior Gerv. 
The E^rimantel and Research Station (59) of Cheshunt Herts ,*&**> 
in 1938 reported that several taste ^^^Z??™^! of Vr cdvcha. 
nicotine were tried end found unsatisfactory for tne control lyr & 
lone-ior in mushroom "beds. 
Unidentified species of Acarina 
See Preston (123) under ticks, on pa,:;e 41. 
. , i -, ■ Ai -o riiprct (\^7>) in 1928 recommended 
The Wo.eningen W"*?""**'^^^" foHhe control of mites. 
Erysit S derris preparation?! and rhytopnmne 
ScKmitt (134) in 1930 reported that g^^^^^t'^S 
of the finely pulverized root of Berris elllytice , cats, do..s, ra 
chickens were freed from mites within 3 to 5 hours. 
