SPRUCE DISEASES 319 



Repbebnces on Brown Felt-Blight 



Stiirgis, W. C. Herpotrichia and Neopeokia on conifers. Phytopa- 

 thology 3 : 152-158, pis. 12-13. 1913. 



Hedgcock, G. G. Notes on some diseases of trees in our national 

 forests. IV. Phytopathology 4 : 181-188. 1914. 



Weir, J. R. A new leaf and twig disease of Picea engelmanni. Jour. 

 Agr. Res. 4 : 251-253, pi. 34. 1915. 



Leaf- and Twig-Blight 



Caused by Pestalozzia funerea Desm. 



A blighting of the leaves and twigs of spruce, pine and hemlock 

 in the nursery and occasionally of slightly older trees is often 

 ascribed to species of Pestalozzia. In most cases the symptoms 

 resemble somewhat those described under seedling twig-blight 

 caused by Ascochyta piniperda (see page 313). Infection occurs 

 in the early spring when the new twigs are developing. Both the 

 needles and stems are invaded by the mycelium and killed. The 

 entire seedling plant is killed while on older trees the current 

 growth only is affected. The spores of Pestalozzia funerea are 

 often definitely associated with these blight symptoms. The 

 spores are pushed out through openings in tlie bark either as 

 cylindrical or flattened horn-like masses. Artificial inocula- 

 tions have proved this species of Pestalozzia to be parasitic 

 under conditions of high humidity. 



Reperences 



Wenner, J. J. A contribution to the morphology and life history of 



Pestalozzia funerea Desm. Phytopathology 4 : 375-384, pi. 27, 



figs. 1-7. 1914. 

 Spaulding, P. A bhght disease of young conifers. Science 26 : 220- 



221. 1907. 

 Hartley, C. Pestalozzia needle blight. In The blights of coniferous 



nursery stock. U. S. Dept. Agr. Bui. 44 : 15-16. 1913. 

 Graves, A. H. Notes on diseases of trees in the southern Appalachians 



III. Phytopathology 4 : 63-72, pi. 5. 1914. 



