STATE POMOLOGICAL SOCIETY. 55 



the dried fruit that remains on the trees all winter (mummied 

 fruit), use sulphate of copper the same as for apple scab, and 

 then Bordeaux mixture, repeated after the leaves appear. The 

 number of times it is necessary to spray depends upon the season. 

 In ordinar}" seasons three or four times will be sufficient. 



Dr. H. A. Robinson : I think I have almost a specific for the 

 cure of black knot. There is no doubt that the pest is decreas- 

 ing at this time. We have less to fight. If all the small twigs 

 can be destroyed, and the rest of the knots covered with the 

 preparation, I think they can be conquered, and easily. I have 

 used, for several years, a mixture every ingredient of which is 

 suited for the purpose, but the mixture of the whole is better. 

 It is linseed oil, kerosene, and spirits of turpentine, equal parts 

 of each, mixed together, and to improve it a small piece of rosin. 

 It makes a sort of varnish. This, applied in the fall, will prevent 

 the ripening of the spores, that takes place in the winter. I have 

 usually applied the mixture twice a year. If it is applied but 

 once, it should be in the fall. I have had large knots slough off 

 the trees, disappear and only a scar remain. I think it is a very 

 effective remedy. 



