- 99 - 
(72) DE LONG, D. M. 
1928. Some observations upon the biology and control of the 
potato loafhcpper ( Erapoas ca f ab e.e Harris). Jovr. 
Soon. But, 21: 185-138. 
(75) DENNIS, W. J. 
1927. Vermifuge and insecticide. U. S. Patent 1,621,240; 
issued March 15, 1927. 
(74) - 
1952, Vermifuge and insecticide. U. S. Patent he. 18,667, 
issued November 22, 1932. 
(75) DF OFG, E. R. 
a.930. The comparative insecticidal value of different species 
of derris. Jour. Econ. Ent. 23: 619-624. 
(76) -- and 7v"HITE, L. T. W. 
1924. Further studies of derris as ar. insecticide. Jo^r. Econ. 
Ent. 17: £99-501. 
(77) DESHPANDE, V, G. 
1957. Cabbage aphid - S iphocoryne indobrass icae - and its 
control v.ith home-made nicotine spray, Agr. and Live- 
stock in India 7: 756-762. 
(78) DEUTSCHE!? PFMFZEFSCEUTZDIENST 
1931. Pflanzenschutamittelverzeichnis des deutschen Pflanzen- 
schutzdienstes 19 31 Mittel gegen Pflanzetokrankheiten, 
Schadlinge. and Unkrauter. Deut. Pflanzcnschutzdienst 
Merkbl. 8 (4), 8 pp. 
(79) DIBBLE, C. B. 
1938. Bug- house fables. Mich. Agr. Ext. Scrv. 8 pp. [Processed.] 
(80) DICKEY, E. D., and LCUCKS, K. W. 
1938. Grape growing in Florida. Fla. Agr. Exp't. Sta. Bui. 324, 
56 pp., illus. 
(81) DITnAN, L. P. 
1959. Practical aspects of pea aphid contr 1. Peninsula Hort. 
Soc. [Del.] Brans. 28: 156-141. 
(82) — CORY, ". ]"., and GRAHAIT, C. 
1939, Studies on pea aphid control. Jour. Been; Ent, 32: 537-546. 
(83) DCFGLASS, J. R., BMFLAhBD, C, and GILLBTB, J. A. 
1059, Field oxporiments for control of t] ] or in 
Idaho, 1956-37. Jour. Econ. Fat. 32: 69-78. 
(84) DUDLEY, J. B. , Jr. 
1935. Insecticide tests against pea aphid. U. S. Dcpt. Agr., 
Bur. Ent. and Plant Quar". Nows Let. 2 (2): 18. [Processed.] 
