Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 196 DISEASES OF CULTIVATED PLANTS the leaf-stalks. Its presence is indicated by the white patches bordered with orange-red. The fungus passes from the leaf- stalks into the root, penetrating to the heart, causing a rot. The conidial fruit first appears on the leaf-stalks, followed by the ascigerous form when the leaves are quite dead. Ascigerous form. Perithecia rounded, brown, asci oblong- clavate, 8-spored; spores hyaline, i-septate, upper cell ovate- rounded, largest, lower c
Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 196 DISEASES OF CULTIVATED PLANTS the leaf-stalks. Its presence is indicated by the white patches bordered with orange-red. The fungus passes from the leaf- stalks into the root, penetrating to the heart, causing a rot. The conidial fruit first appears on the leaf-stalks, followed by the ascigerous form when the leaves are quite dead. Ascigerous form. Perithecia rounded, brown, asci oblong- clavate, 8-spored; spores hyaline, i-septate, upper cell ovate- rounded, largest, lower cell narrower, 21 x 7'5 /*. Fig. i2,.—Sphaerella tabijica, causing heart-rot of orange-globe mangold. Conidial form. Perithecia subglobose, conidia elliptical, hyaline, 5-7 x 35 f, escaping as a gelatinous tendril. As the disease appears somewhat late in the season, it is advisable to lift the crop when it is first observed, before the fungus passes from the leaves into the root. Diseased ' tops' should be collected and buried. It is important not to include diseased roots when storing, and if diseased roots are found when the pits are opened they should not be thrown on the manure heap or into the pig-stye, but buried, otherwise the disease will find its way back to the land. Frank, Zeitschr. Ziic/ierr., 1892, p. 904. M'\N'eeney, /ourtt. Roy. Agric. Soc, Ser. 3, 6, pt. 3 (1895). Prillieux, Malad. des Plantes Agric, 2, p. 263 (1897).
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