48o 



SPECIAL PLANT PATHOLOGY 



The hyphae grow beneath the epidermis and between the epidermis 

 and cuticle spreading slowly. The erect conidiophores, which are 

 produced, rupture the epidermis, giving the characteristic velvety, 



Fig. 164. — Two apples affected with scab (Venluria inequalis), showing spots, 

 deformation and reduction in size of the fruit. (After Heald, F. D.. Bull. 35 (Set. 

 Ser. 14), Unis. of Tex., Nob. 15, 1909.) 



Fig. 165. — Two apples affected with scab (Venturia inequalis). showing spots, 

 deformation and reduction in size of the fruit. (After Heald. F. D., Bull. 135 (Sci. 

 Ser. 14), Univ. of Tex., Nov. 15, 1909.) 



olivaceous character to the spotted surface, and as the scabby areas 

 are formed, the epidermis disappears. Conidiospores arise at the tips 

 of the conidiophores and in concatenation. These spores are ovate, 



