90 



GENERAL ADVICE 



hock. In this case the pustules of the fungus 

 are very definite upon the under side of the leaf, 

 and each pustule, as in the case of the plum dis- 

 ease, may represent a distinct attack of fungus. 

 The constitutional and bacterial diseases usually 

 affect the whole plant, or at least large portions of 



90. Hollyhock rust. Under side of leaf. 



it ; and the seat of attack is commonly not so 

 much in the individual leaves as in the stems, the 

 sources of food supply being thereby cut off from 

 the foliage. The symptoms of this class of dis- 

 eases are general weakening of plant when the dis - 

 ease affects the plant as a whole or when it attacks 

 large branches ; or sometimes the leaves shrivel 



