Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] DASYSCYPHA 281 willkofnmii {\ldixi\g), is present in greater or less abundance, depending on local conditions, elevation, etc., wherever the larch {Larix europaea, D. C.) grows. It also attacks the Scots pine {Finns silvestris, L,), the silver fir {Abies pectinata, D. C), Finns laricio (Poir.), and the Japanese larch {Larix lepto- lepis, Endl). Until recently it was considered that the Japanese larch grown in this country was immune to this disease; this, however, is not so, as
Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] DASYSCYPHA 281 willkofnmii {\ldixi\g), is present in greater or less abundance, depending on local conditions, elevation, etc., wherever the larch {Larix europaea, D. C.) grows. It also attacks the Scots pine {Finns silvestris, L,), the silver fir {Abies pectinata, D. C), Finns laricio (Poir.), and the Japanese larch {Larix lepto- lepis, Endl). Until recently it was considered that the Japanese larch grown in this country was immune to this disease; this, however, is not so, as I have seen specimens bearing this disease from England, Scotland, and Wales respectively. In Southern Europe canker occurs on young Fig. z.—Dasyscypha calycina. i, larch branch diseased ; 2, fungus causing disease ; 3, ascus with spores and paraphyses. Figs. 2 and 3 mag. branches of the mountain pine {Finns pumilio, Haenke), and the balsam fir {Abies ba/samea, Miller) suffers from this disease in the United States. The fungus is a wound parasite, as first indicated by Hartig ; this statement I have corroborated by over a hundred experiments on trees of various ages, and situated in different parts of the country. Fresh ascospores, that germinated readily in water, were placed on the bark of young branches, also in crevices of older branches, but no inoculation followed in a single instance, although provision was made against dessication or removal of the spores by rain. Several similar
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