REPORT OF THE SOCIETY 85 



Raspberry Cane Blight 



All the diseased canes were carefully removed from a badly affected 

 plantation, which was then sprayed with Bordeaux mixture, (4-4-40). 

 This treatment was followed in the succeeding spring by three other spray- 

 ings. Little if any benefit was obtained by the treatment, since the new 

 canes were badly attacked during the ensuing summer. In another planta- 

 tion the practice of cutting out all the affected canes at intervals during the 

 summer has been followed, and this method has given quite promising 

 results as far as the work has gone. 



Peach Canker 



The canker disease is quite prevalent in the peach orchards in Ontario, 

 and it is particularly important in the Niagara Peninsula, where the ordin- 

 ary orchard shows an average of 23 cankers per tree. The factors at work 

 in producing the disease have been satisfactorily studied, and experiments 

 have indicated a satisfactory method of control. A bulletin is now being 

 prepared for the press on this disease. 



Brown Rot of Stone Fruits 



Some attention has been given to this disease from year to year. The 

 prevalence of the spring or apothecial stage has been studied, and it has been 

 found to be quite generally produced on the buried, fallen fruits of the plum 

 and peach. This stage of the fungus is certainly prevalent enough to be a 

 considerable factor in carrying the disease over the winter. The role of the 

 "mummies" left on the trees over winter in starting the disease next spring 

 has also been considered as a question of much practical interest. It has 

 been found that in the warm, moist conditions of spring the dormant 

 fungus in these mummies resumes its activities and produces fresh spores 

 abundantly. Even if the trees have been well sprayed with lime-sulphur, 

 the fungicide has been shown to have little or no effect in checking the plenti- 

 ful production of the spores on these mummies. In addition it has been 

 demonstrated very clearly that when the rotten fruits remain on the tree 

 for some time, their juice passing back into twigs and branches kills and 

 blackens them for considerable distances. From these various results it is 

 apparent that the removal and elimination of the rotten fruits is a very 

 important factor in the control of this disease. 



