Arizona Agricultural Expe;rime;nt Station 



417 



Perilla, a crop native of Japan, is interesting as a possible 

 source of a linseed oil substitute. The crop sufifers very much from 

 the arid atmosj)here of the Salt River Valley and it was impossible 

 to obtain a satisfactorv stand. 



FiK. 9. — Cowpeas. Salt River Valley Farm. 



DISEASES 



A fung'us disease of cotton, and the lesser corn-stalk borer, 

 both appeared on the Salt River Valley Farm this year. The former 

 has been noticed before and does not appear to be serious. In 

 effect it is very similar to the sore-shin noticed in upland cottons 

 all through the cotton belt of the United States. Of this disease 

 Professor J. G. Brown of the Department of Biology of the Uni- 

 versity says : 



"Sore-shin probably is caused by other fungi besides R!\i.zac- 

 tonia and Atkinson has even found Fiisarium ]:)resent. The cotton 

 seedlings submitted to me presented a marked constriction at and 

 below the soil line. In these constricted places a brownish discolo- 

 ration was often evident. Microscopic examination of the roots in 

 section disclosed cankers, in places reaching through the bark and 

 into the cortex, in other spots extending entirely through the 

 phloem and cambium. Usually infected areas could be traced bv a 



