Annals 



of the 



Missouri Botanical Garden 



■ 



Vol. 9 NOVEMBKR, 1922 No. 4 



A BACTERIAL DISEASE OF FOXTAIL 

 (CHAETOCHLOA LUTESCENS) 1 



H. R. ROSEN 



Associate Plant Pathologist, University of Arkansas, 

 Formerly Rufus J. Lackland Fellow in the Henry Shaw School of Botany of' 



Washington University 



Introduction 



In a brief note published in March, 1919, the writer called at- 

 tention to a disease of foxtail common in Arkansas. It was 

 pointed out that the pathogen, a whitish bacillus, was capable of 

 attacking a number of grasses, including most of the common 

 cereals. Since then an intensive study has been made of this 

 disease, with the object of establishing its symptoms and etiology, 

 and in the pursuit of this investigation facts were evolved which 

 clearly showed the necessity of using certain methods in the study 

 of plant pathogens which are not ordinarily in vogue among 

 plant pathologists. 



Bacterial Diseases of Gramineae in General 



Since the studies here presented indicate that the disease pro- 

 ducer has not been previously described it seems desirable, for 

 comparison, to review briefly the bacterial diseases of the Gram- 

 ineae. Smith (I, '20, p. 7) 2 has recently given a list of plant 

 genera which are known to be attacked by one or more bacterial 

 species. In this is included the following grass genera : Hordeum, 

 Dactylis, Bromus, Zea, Setaria, Andropogon, A vena, Saccharum, 

 Secale, Triticum, Phleum, Poa, and Agropyron. These 13 genera, 





^Submitted for publication May, 19 



*The bibliography is divided into two parts, the first part dealing with refer- 

 ences to bacterial diseases of grasses, designated I, and the second part dealing 

 with morphological and physiological references, designated II. 



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