Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] NECTRIA â 79 brittle. Experiments have proved that the ascospores when placed on the young leaves, germinate, enter the tissues, and give origin to the disease. give origin to the disease. Ascigerous form. Stromata flattened, developed on under surface of the leaf, reddish, then orange-brown, osti Fig. 46.âPolystigma rubrum. i, diseased plum leaves; 2, section through stroma showing perithecia ; 3, asci containing spores ; 4, spermatia produced in spermogonia. Fig. i reduced
Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] NECTRIA â 79 brittle. Experiments have proved that the ascospores when placed on the young leaves, germinate, enter the tissues, and give origin to the disease. give origin to the disease. Ascigerous form. Stromata flattened, developed on under surface of the leaf, reddish, then orange-brown, osti Fig. 46.âPolystigma rubrum. i, diseased plum leaves; 2, section through stroma showing perithecia ; 3, asci containing spores ; 4, spermatia produced in spermogonia. Fig. i reduced ; remainder highly mag. sunk in the tissue; asci clavate; 8-spored; spores elliptical, obtuse, straight, subhyaline, 10x6//. Conidial form { = Libertella rubra, Bonor.). Spermatia filiform, slightly thickened at one end, curved, 30 \x. long. Prillieux, Alalad. des Plantes Agric, 2, p. 91 (1897). B. Spores hyaline, i-septaie { = 2-celled). NECTRIA (Fries.) Perithecia distinct, clustered, or scattered, sometimes pro- duced on a fleshy stroma that has previously borne conidia, fleshy or sub-membranaceous, clear coloured, usually red or orange; asci cylindric-clavate, 8-spored; spores hyaline, elongated, i-septate.
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