278 PLANT DISEASES 



irregular patches encircling the branch, in which case the 

 portion above the diseased area dies. 



Dr. Sorauer considers that an ascigerous fungus, called 

 by him Stigmatea mesptlt, which occurs on the diseased 

 spots on fallen leaves previously occupied by the 

 Entomosporium, is really the higher condition of that 

 fungus; this idea has not, however, as yet been corrobo- 

 rated by cultures. 



PREVENTIVE MEANS. Spraying with Bordeaux mixture 

 holds the disease completely in check ; the first spraying 

 should be applied, using a very dilute solution, as the 

 leaves are expanding. 



Dead leaves should be collected and burned. Diseased 

 branches should be removed, as it is probable that the disease 

 first originates as an epidemic in the spring, from spores 

 produced by the mycelium permanent in the branches. 



Leveille, Bull. Soc. Bot. France, vol. iii. p. 31. 



Sorauer, Handb. der Pflanzenkrankfieiten, vol. i. p. 372, 

 pi. xvi., figs. 6-9. 



Galloway, Rep. Commits. Agric. t/.S., 1889, p. 357, pi. 

 viii., ix. 



Entomosporium thumeni, Sacc. Somewhat similar in 

 appearance to E. maculatum ; occurs on living leaves of 

 species of Crataegus. 



MELANCONIACEAE 



GRAPE ROT 



(Gloeosporium ampelophagum, Sacc.) 

 This minute fungus is one of the scourges of European 

 vineyards, where its ravages have repeatedly proved most 

 disastrous. In Britain, however, it is not common, and 



