. Fungous diseases of plants, with chapters on physiology, culture methods and technique . red borders, on the leavesof various species of Rubus,both blackberries and The fungus has beenreported from many sectionsof the world, and is doubtless very generally distributed. Pyc-nidia are developed in the center of the larger spots, and thesegive rise to long tapering spores, 40-50/x, ordinarily twice ormore septate by rather indistinct divisions. Septoria consimilis E. & M. The lettuce leaf spot, caused bythis fungus, is prevalent on garden lettuce, particularly during thelatter pa
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . red borders, on the leavesof various species of Rubus,both blackberries and The fungus has beenreported from many sectionsof the world, and is doubtless very generally distributed. Pyc-nidia are developed in the center of the larger spots, and thesegive rise to long tapering spores, 40-50/x, ordinarily twice ormore septate by rather indistinct divisions. Septoria consimilis E. & M. The lettuce leaf spot, caused bythis fungus, is prevalent on garden lettuce, particularly during thelatter part of the season. It is perhaps the chief spot fungusof this plant, but may be held in check by the immediate destruc-tion of the discarded and seeded plants in the field at the close ofthe season. Septoria Dianthi Desm. produces small brown spots upon theleaves and internodes of the carnation. The leaves are often bent 1 Pammel, L. H. Spot Diseases of Currants and Gooseberries. Iowa Agl. Built. 13: 67-70. Jigs. /5-/(5. 1891. 2 Ohio Agl. Exp. Sta. Built. 4 (6) : 126. Fig. 181. Leaf Spot of Currants(Photograph by F. C. Stewart) ;64 FUNGOUS DISEASES OF PLANTS or distorted. This disease is not likely to be serious where properventilation and subirrigation are provided for. Septoria Chrysanthemi Cav. may become a serious pest uponthe maturing leaves of the cultivated chrysanthemum. LII. CURRANT CANE BLIGHT Dothiorella This disease appears to be most abundant in the HudsonValley in New York. It has, however, been found in othersections, though not destructive. The affected canes are wiltedand killed during midsummer. The disease is probably more easily seen during a dry period on ac-count of the fact that when the watersupply is abundant, it may not benoticeable during the growing fungus producing this disease hasbeen isolated from both the diseasedwood and pith, and upon infection iscapable of reproducing the disease. Sev-eral fruiting stages have been fo
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