GIRDLING OF SILVER FIR 275 



GIRDLING OF SILVER FIR 



{Fusicoccum abietinum, Sacc. 

 ■==.Phoma abietina, Hartig.) 



Hartig called attention to a disease of the silver fir, 

 which, although previously undescribed, is very common in 

 the Bavarian Forest, Black Forest, etc. The disease is 

 characterised by usually killing the bark all the way round 

 both small and large branches. If the bark is only killed 

 on one side of the branch, it is shed, and a callus forms 

 along the uninjured margin. 



Numerous minute black stromata containing cavities 

 bearing small fusiform conidia are developed in the dead 

 cortex, and rupturing the tissues appear on its surface. 



Hartig and Somerville, Diseases of Trees, p. 138, figs. 

 Prillieux, Malad. des Plantes Agric, vol. i. p. 285, figs. 

 M.ex., Journ. de Bot., 1893, p. 364. 



PEA SPOT 



{Ascochyta pisi, Libert.) 



Sometimes injurious to cultivated peas (Pisum sativum), 

 haricot beans (Phaseolvs vulgaris), and species of Vicia, 

 and Cercis. Pale spots are formed on the pods which 

 cause them to become stunted and deformed. The leaves 

 and stem are also attacked. 



Preventive Means. — None recorded. Probably spray- 



