250 PLANT DISEASES 



and wild grasses belonging to the genera Bromus, Trisetum, 

 and Triticum. Paraphyses are present in the teleutospore 

 sori. 



Pucdnia simplex, Eriks. and Henn. Aecidium unknown. 

 Uredo and teleutospore conditions on leaves of barley. 

 Paraphyses are present in the teleutospore sori. 



CELEEY LEAF RUST 



{Pucdnia bullata. Winter.) 



This fungus forms small warts on the leaves, which are 

 brown when the spores rupture the epidermis and are 

 exposed. It occurs on celery, parsley, and dill, also on 

 various wild umbelliferous plants, and proves destructive 

 when present in quantity. 



PREVENTIVE MEANS. Spraying with dilute Bordeaux 

 mixture checks the spread. Diseased leaves should be 

 cleared and burned. 



Zimmermann, Atlas der Pflanzenkrankheiten, Heft 3 

 (1886). 



Smith, Card. Chron., 1886, Dec. n, figs. 



SUNFLOWER RUST 



(Pucdnia tanaceti, D. C.) 



This rust forms brown pustules on the leaves of the 

 common sunflower (HeliantJius annuus), which are some- 

 times so abundant that the leaf is destroyed ; and as all 

 the leaves on a plant are usually attacked, the plant is 

 prevented from producing fruit. 



PREVENTIVE MEANS. Repeated spraying with Bordeaux 

 mixture holds the disease in check. 



