72 SPRAYING CROPS 



erally reveals one or more blackish points consist- 

 ing of the fruiting spores of the fungus. It is by 

 means of these that it passes the winter, and propa- 

 gates itself. The affecjed leaves often turn yellow 

 and fall off. 



Remedies It has been definitely proven that these 

 diseases may largely be prevented by spraying. A 

 treatment similar to that recommended for apple-scab, 

 one spraying with dilute Bordeaux mixture before 

 blossoms open, then two or three sprayings with Bor- 

 deaux mixture having an excess of lime and one of 

 the arsenites after the fruit forms, is the most prom- 

 ising treatment for both insect and fungus pests. It 

 may be necessary to make one or two late sprayings 

 with a carbonate of copper solution in case rot sets in. 

 The mummied plums should be picked off and burned 

 in the winter; and an early spring spraying with 

 simple solution of copper sulphate, applied before the 

 buds swell, is very beneficial. The Japanese plums are 

 very sensitive to sprays, but they are less liable to 

 these diseases. 



