Fig. 23. Lettuce Diseases. 



a Germinating sclerotium of SderoHnia liberliana 

 the'cause of lettuce drop, 6. section of fruiting cup 

 (aoothecium) showing asci. ascospores and fiaraphyses 

 of S. liberliana. c. section through sclerotium of A. 

 /.•;.»w.-^«" J r-^-T-.-.-ating ascospore of 5. «Offnia?ia (.a. 

 ':'. ,. r'-. ■- - — vens), e. Cercospora leaf spot. 



