REPORT OF THE SOCIETY 109 



superficial mycelium was abundant at the place of inoculation and has pene- 

 trated the tissues which it was covering but has not spread any farther. 



Sclerotia remain dormant in the soil until early summer when it is possible 

 they may germinate giving rise to apothecia bearing ascospores. So far no 

 apothecia has been observed by the writer in the development of the sclerotia. 



The sclerotia may also live over winter in the soil and germinate by 

 m5^celium which can infect the plants, which has been shown above. 



No definite name can yet be given to the fungus which causes this potato 

 disease in New Brunswick, but on the results so far obtained and on the micros- 

 copical examination of the mycelium, it is identical with that of (Sclerotinia 

 lihertiana Fckl.) This is shown in Fig. 6. All tend to show that the fungus 

 is S. lihertiana. 



Control 



The only satisfactory means of control are crop rotation so that susceptible 

 plants are not available to the fungus and careful removal and destruction of 

 diseased plant parts. 



