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PHYTOPATHOLOGY. — Studies of fungous parasites belonging to the 

 genus Glomerella. C. L. Shear and Anna K. Wood. U. S. De- 

 partment of Agriculture, Bureau of Plant Industry, Bulletin 252, 

 pp. 1-110, pis. 1-18, text figs. 4. Issued January 25, 1913. 



This bulletin contains an account of investigations of fungous parasites 

 which produce the diseases commonly called "anthracnoses." Most 

 cultivated fruits and many other economic plants are frequently attacked 

 and seriously injured by fungi belonging to the genus Glomerella. 



These fungi produce three distinct spore forms in the course of their 

 complete development — conidia, ascospores, and chlamydospores, or 

 appressoria. Until recently the two principal forms of fructification, 

 conidial and ascogenous, have been described and treated as separate 

 organisms, the genetic relationships not being known. 



The conidial stage is most frequently found and has usually been 

 referred to one or the other of the form genera Gloeosporium and Colle- 

 totrichum. About 500 so-called species probably belonging to the coni- 

 dial stage of Glomerella have been described. 



The genetic connection of the conidial and ascogenous stage of these 

 organisms was first definitely proven in cultures in 1898 by Atkinson in 

 the case of Glomerella (Gloeosporium) cingulata (Stonem.) S. & v. S. found 

 on privet (Ligustrum vulgare) , Since that date the life history of races, 

 strains, or species of the organism from several other host plants has been 

 recorded by various investigators as well as the present writers. 



The life histories of forms from 36 different host plants are recorded 

 in this paper. In 17 cases they were developed in pure culture and in 

 the other 19 cases on the host plant, either in moist chamber or under 

 natural conditions. In 31 cases the connection between the conidial 

 and ascogenous stages was first reported by the writers. 



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