122 



Erwin F. Smith first described cucurbit wilt in 1893- 

 Somewhat later Smith suggested that insects might he 

 responsihle for the dissemination of the disease. It was 

 not until 1915; however, when Rand advanced experimental 

 proof incriminating the two cucumber heetles listed ahove, 

 Rand and Cash (1920) have shown that the adult heetle of 

 Diahrotica vittata may harhor the hacteria in its "body 

 over winter. 



See Bergey's Manual (1939; 5th ed. , page ^17) for a 

 description of this "bacterium. 



Rand, F. V. 1915 Dissemination of hacterial wilt of 



cucurbits. J. Agr. Research, 5? 257-260. 

 Rand, F. V. , and Cash, L. C. 1920 Some insect relations 



of Bacillus tracheiphilus . Phytopath. , 10, 133*1^0. 

 * Smith, E. F. 1893 Two new and destructive diseases of 



cucurbits. Bot. Gaz. , 18, 339* 



Trihe: EscHERICHEAE 

 Genus : Aerohacter 



Aerobacter aerogen ES (Kruse) Beijerinck 



Insects concerned: Euxoa segetum ; the caohage "butterfly, 

 Pieris rapae ; Pentatomidae (prohahly Loxa variegata ) ; the 

 potato "beetle, Leptinotarsa decemlineata ; the meadow grass- 

 hopper, Conocephalus fasciatus, var. fasciatus ; the cricket, 

 Neombius fasciatus var. fasciatus ; and Urographies fasciata . 



Stutzer and Wsorow (1927) found Bacillus lactis aero - 

 genes [ Aero"bacter aerogenes] to he part of the normal flora 

 of the intestines of healthy caterpillars of Euxoa segetum . 

 Steinhaus (19^-1) isolated it from the intestinal tracts of 

 the ahove listed insects ( Euxoa segetum excepted). 



A complete description of the Aerooacter aerogenes may 

 "be found in Bergey Manual (5th edition, p. 396) • 



Steinhaus, E. A. 19^1 A study of the hacteria associated 

 with thirty species of insects. J. Bact. , W?_, 757-790. 



Stutzer, M. J. and Wsorow, W. J. 1927 Veher Infectionen 

 der Raupen der Wintersaatenle ( Euxoa segetum Schiff . ) 

 Centr. f . Bakt. u. Parasit. , 71, II3-I29. 



