f 



SCLEROTINIA DISEASE OF CAULIFLOWER. 



151 



wounded but not inoculated remaining free from the dis- 



ease. 



The fungus was again isolated 



from the inoculated 



% 



plants and grown in pure cultures 

 with the same results as in the 

 former instance. 



Sclerotinia sclerotia, after re- 

 maining dry for over a year, threw 

 out filaments, developed an exten- 

 sive mycelium, and formed new 

 sclerotia in less than two weeks 

 from the date they were placed in 

 fresh potato tubes. This indicates 

 the great vitality of the fungus 



while in this stage. 



Botryt 



used than of Sclerotinia in the 

 parallel experiments, but later 



SCLEROTINIA ASCI. 



Bot 



Botryt 



from 



which is still in progress at the time of writing. 



Mississippi Valley Laboratory. 



EXPLANATION OF PLATES. 



Plate 32. 



Sclerotinia Libertiana. I, Upper view of a group of apothe- 

 cia^ most of which are mature. 2, Sclerotia with apothecia developing. 



Sclerotinia Libertiana. I, 2, Sclerotia before, during, and 



Plate 33. 



after the development of apothecia. 



i 



Plate 34. 



Sclerotinia Libertiana. Pure cultures on agar slant tubes. 



The dark bodies are sclerotia. 





