Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] DIDYRIELLA 209 DIDYMELLA (Sacc.) Perithecia immersed, membranaceous, asci 4-8-spored, paraphyses present; spores elongated, i-septate, hyaline. Differs from Sphaerella in having paraphyses. Orange-tree canker {Didymella ciiri., Noack) forms long canker-like v/ounds with thickened margins on the branches of orange-trees in Brazil. The first symptom of disease is the Fig. 59.— VenturiiZ pirina. i, conidial form of fungus on pear leaf; 2, conidial form of fungus on pear, causing
Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] DIDYRIELLA 209 DIDYMELLA (Sacc.) Perithecia immersed, membranaceous, asci 4-8-spored, paraphyses present; spores elongated, i-septate, hyaline. Differs from Sphaerella in having paraphyses. Orange-tree canker {Didymella ciiri., Noack) forms long canker-like v/ounds with thickened margins on the branches of orange-trees in Brazil. The first symptom of disease is the Fig. 59.— VenturiiZ pirina. i, conidial form of fungus on pear leaf; 2, conidial form of fungus on pear, causing scab ; 3, fruit of conidial stage, highly mag. shrinking and depression of a patch of bark, on which longi- tudinal and transverse cracks appear. When the wound becomes open, black pycnidia appear, followed by the asci- gerous form of fruit. Pyenidia very minute, o-2-o'4 mm. diam., conidia colour- less, fusiform, 7-9x2-2-5 jx, on the tips of branched conidio- phores. Perithecia depressed globose, with a long, stout beak; O
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