- i6o - 
320. POOS, p. W4 
19^0. The locust leaf minor as a -oast of Boy-oean. Jour. 
3con. i]nt. 33:7^2-7^5. . . . ". 
321. POTTS, S. P. 
1937. Control of white pine weevil and Suropecn pine shoot moth. 
U. S. Dcpt. Agr., Bur. 3nt . and Plant cj,uar. Uews Let. 
U(g):10 [Processed.] 
322 . 
193s. Spraj^s tested against white pine weevil anr. European pine 
shoot moth. U. S. Deot. Agr., Sur. 51nt , and Plant Q,uar. 
ITews Let. 1+(S): 12^.13 [Processed.] 
323. PRZNTISS, R. J., and C 01 IF AIT Y, Inc. 
1935 • Rotenone content of dusts. Important that manufacturers 
place less emphasis on rotenone analy-sis and more on 
total toxicity. Derris Developments ¥.0 . 5, ^ P?. 
32U. El^J^I), ¥. D., and HOOKOM, D. tf. 
1937' Dusts containing rotenone or pyrethrum not effective 
against adults of the cigarette heetle. U. S. Dept. 
Agr., Eur. Snt . and Plant ^uar . iJews Let. U(lO):27. 
[Processed.] 
325. RICHMOinD^ 3. A. 
1931- The relative attractiveness or repellence of certain materials 
to the Japanese heetle (Popillia japonica Kewm.). F. J. 
Dept. Agr., Cir. I90, 12 pp. 
326. RIPP^, ¥. 
1935. Louensweise und Bokam.pfung des Halmcrdflohes ( Chao toe noma 
aridul-a G-y l lh.) Ztschr. f. Angow. Snt . 23(3) : 370-Ul6~ 
327. ROARK, R. C. 
193s • Derris versus cuhe — Is cuh.: equal to derris as an 
insecticide? Soap lU(l)Ull-113, 120. 
32s. ROBir, P. 
1935* 1^32 poudros vegetalos dans la lutto centre le doryphore. 
Rev. de Path. Yog. et d':^nt. A-r. do Prance 22(U) : 2gS-297. 
329. -_- 
1936. Derris dust kills western spotted cucumber "beetle at low 
temperatures. U. S, Dept. Agr., Bur. .'-nt . and Plant 
«^uar. News Let. 3(^^)'^ [Processed.] 
330. RO.-SUGK, A. 
1937. The cabhage stem flea boetlo ( Psyl liodos chrysocephala L.). 
Derbyshire Parmer 17(5) :l69-170. Derb-, May I937. 
[Abstract in Rev. A.vol. 3nt . (A) 25:6ll. 1937.] 
