. Fungous diseases of plants, with chapters on physiology, culture methods and technique . ) : CENTER PLANT, CONTROL is first water-soaked in appearance. Later this area shrivels, andthe diameter is much less than that of the healthy stem seedlings seldom survive. The pycnidia are producedabundantly on the drying areas. XLIV. PHYLLOSTICTA Phyllosticta Paviae Desm. The leaf blotch caused by this fungusis probably the most important malady of the horse-chestnut. Theirregular spots develop rapidly as the season advances, and thelarger part of the leaf may become involved, from the
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . ) : CENTER PLANT, CONTROL is first water-soaked in appearance. Later this area shrivels, andthe diameter is much less than that of the healthy stem seedlings seldom survive. The pycnidia are producedabundantly on the drying areas. XLIV. PHYLLOSTICTA Phyllosticta Paviae Desm. The leaf blotch caused by this fungusis probably the most important malady of the horse-chestnut. Theirregular spots develop rapidly as the season advances, and thelarger part of the leaf may become involved, from the margin to 346 FUNGOUS DISEASES OF PLANTS the midrib, as if sunburned. Eventually the leaves fall prematurelyand the vitality of the tree is greatly affected. The perithecia appearon the upper surface of the leaves, but are not usually present, atleast abundant, over the whole affected Fig. 167. Phyllosticta solitaria: Apple Blotch Phyllosticta hortorum Speg.^ occurs both upon leaves and fruitof the eggplant {Solamim Meloitgejia), producing upon the lattersoft spots which become shrunken and decayed, rendering the fruitworthless. Phyllosticta solitaria E. & E. A fungus producing a destruc-tive fruit blotch ^ of the apple in the South has recently beenidentified as the above species. The disease is more commonupon the light colored varieties of this fruit. 1 Halsted, B. D. Some Fungous Diseases of the Egg Plant. The Leaf-SpotFungus. N. J. Agl. Exp. Sta. Rept. 12: 279-281. 1890. 2 Scott, W. M., and Rorer, J. B. Apple Blotch. Bureau Plant Ind., U. S. Built. 144: 1-28. pis. 1-6. 1909. FUNGI IMPERFECTI 347 Phyllosticta maculicola Hals.^ is the cause of a very commonleaf spot of several species of Dracaena and Cordyline. The spotsare characterized by pale centers and reddish or purplish disease is sometimes severe in greenhouses where it has long
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