10 



surface develops, containing another crop of spores. 

 Spraying has not been found to be of much use in treating 

 this disease. The best that can be done is to cut out and 

 destroy the diseased parts, painting the wounds to prevent 

 the entrance of fresh spores of the fungus. As cultivated 

 trees may be infected from the wild ones, the latter also 

 should be taken care of. All farmers should unite in trying 

 to stamp out this disease. 



The Rot affects the fruit, and sometimes the leaves and 

 young twigs. On the fruit it appears as a brown spot, 

 which soon spreads, often over the whole surface of the 

 fruit. The diseased surface soon becomes covered with 

 many little ash-gray spots or tufts, which consist of spore- 

 stalks bearing innumerable spores. Spraying as yet has 

 not proven very satisfactory as a preventative of the Rot. 

 The diseased fruit should be thoroughly removed as fast as 

 it appears, and destroyed, and it would be well to spray the 

 trees in the spring, before the buds open, with the simple 

 solution of blue vitriol. 



It is a rule which may be held as applying to all fungus 

 diseases, that all diseased parts should be carefully collected 

 and destroyed by burning. 



The Blight or Rust of potatoes is a disease which can be 

 profitably treated by spraying. A bulletin on this subject 

 will appear later. 



SUMMARY OF EXPERIMENTS IN THE TREATMENT OF THE 

 SCABBING AND CRACKING OF APPLES AND PEAKS. 



The extent of these experiments has been limited by the 

 difficulty of finding suitable trees in the vicinity of the 

 experiment station. In 1892 a Fameuse apple-tree was 

 sprayed with Bordeaux mixture on June 8, 16, 29, July 9, 

 and August 5. Another tree of the same variety was left 

 unsprayed for comparison. The apples were gathered 

 October 7, with the following result : 



