98 DISEASE IN PLANTS. 



and a necrotic area is formed, or the cortex bursts 

 and a wound is formed in another way, or some 

 fungus gets a hold, and so on. These abnormal 

 states are particularly apt to predispose the plant 

 to disease insects revel in such semi-wilted leaves 

 and shoots crammed with reserves, and fungi in 

 the water-logged leaves of the second case, while 

 a cold dry wind is peculiarly fatal to such tissues. 



Notes to Chapter X. 



The reader may consult Hartig, Diseases of Trees, Eng. 

 ed., 1894, Introduction ; Sorauer, Pflanzen Krank/ieiten, pp. 

 1-12, and Yrzx\k, Die Krajtk/mten der Pflanzen, B. i, p. 5, 

 for definitions of disease. 



