Chrysanthemums. 187 



blotches, usually about half to three-quarters of in inch 

 in diameter. In these blotches are found the spore heaps 

 or pits and beyond them the leaf turns yellow ; not 

 long afterwards the whole leaf shrivels and is drawn 

 downward to the stem. 



" As the hyphffi of this fungus grow through the tis- 

 sue of the leaf it cannot be easily reached by external 

 applications. Doubtless the best course is to burn the 

 affected leaves or destroy the plant as sooir as the dis- 

 ease is observed." 



Another grower of the chrysanthemum tells me he 

 observed the same disease on some imported plants at 

 about the satne time as those just described. These he 

 removed at once and burned them. Evidently this 

 was accomplished before the spores had time to ripen 

 and spread, as he saw no indications of the disease aft 

 erwards. The experience of these two growers shows 

 us conclusively, that we cannot be too watchful, and 

 that great care must be taken if the disease is once dis- 

 covered, to stamp it out immediately. 



The black aphis so troublesome to the chrysanthe- 

 mum is more tenacious of life than the common green 

 fly. If tlie usual fumigation does not destroy it, the 

 plants should be syringed with a strong decoction of 

 tobacco water. 



