172 



Phytomonas stewart I ( Smith) Bergey et al. 



Insects concerned: Phyllophaga sp. ; Chaetocnema denticu - 

 lata; Chaetocnema pull car la ; Dla"brotica duodecimpunctata ; 

 Diahrotica longicornis . 



Phytomonas stewarti Is a "bacterium which gives rise to 

 a wilt in corn ( Zea may_s ) . Sweet corn seems to he the 

 most susceptible, although, according to Leach (19^0), 

 teosinti ( Euchlaena mexicana) , and Tripsacum dactyloides 

 are known to "be susceptible. The organism is essentially 

 a vascular pathogen although other tissues are frequently 

 affected. 



Rand (1923) was the first to prove that insects could 

 disseminate the disease. He demonstrated that the "brassy 

 flea "beetle, Chaetocnema pulicaria was responsible for the 

 secondary spread of wilt in midsummer. 



For a description of this "bacterium see Bergey's Manual 

 (1939) 5th ed. , page, 21*0. 



Leach, J. G. 19^+0 Insect transmission of plant diseases. 



615 pp. McGraw-Hill Book Company, New York. 

 Rand, F. V. 1923 Bacterial wilt or Stewart's disease of 



corn. The Canner, ^6, 16^-165. 



Phytomonas tumefac 1 ens (Smith and Townsend) 



Bergey et al . 



(See Bacterium tumefac i ens. ) 



Genus: Pseudomonas 



Pseudomonas aerug I NOSA (Schroster) Migula 

 (See Bacillus pyocyaneus . ) 



Pseu domon AS FERMENTANS Von Wolzogen Kuhr 

 (See Flavohacterium f ermentans . ) 



Pseu domonas fluorescens Migula 

 (See Pseudomonas fluorescens liquefaciens . ) 



