. The fungi which cause plant disease . Plant diseases; Fungi. (see p. 46) of potatoes; it is perhaps identical with F. sporum. F. erubescens A. & v. Ov. produces small black sunken spots on green and ripe toma- toes in Germany *'"' re- sulting finally in mummi- fication. Parasitism by means of enzymes was demonstrated. F. lycopersici Sacc.^"'"^"- Sporodochia as in F. oxy- sporum; conidia falcate, acute, 25-30 x fi, .^^SS^S^SZSS^KSU H-i hyaline to yellowish. It is the cause of a to- mato wilt or "sleeping disease" resulting from in- ^'°- ^*^-^- "'^-
. The fungi which cause plant disease . Plant diseases; Fungi. (see p. 46) of potatoes; it is perhaps identical with F. sporum. F. erubescens A. & v. Ov. produces small black sunken spots on green and ripe toma- toes in Germany *'"' re- sulting finally in mummi- fication. Parasitism by means of enzymes was demonstrated. F. lycopersici Sacc.^"'"^"- Sporodochia as in F. oxy- sporum; conidia falcate, acute, 25-30 x fi, .^^SS^S^SZSS^KSU H-i hyaline to yellowish. It is the cause of a to- mato wilt or "sleeping disease" resulting from in- ^'°- ^*^-^- "'^- ^*""^°""y- vasion of the ducts. Conidia of two kinds are produced, Fusa- rium and Diplocladium. Infection is subterranean. A nearly related disease differing chiefly in the fact that the fungus does not reach far above ground has been described by Smith.^"^ The fungus in both cases is perhaps identical with F. oxysporum. «' Sporodochia erum- pent, compact, cream to flesh-colored; co- nidiophores short, much-branched; co- nidia 3-septate, fusi- form, slightly curved to falcate, 27-38 x li. A serious widespread flax wilt is caused. The mycelium develops luxuriantly from bits of diseased stem laid in sterile Petri dishes and grows well in culture media. Normally a soil saprophyte, it invades the roots, grows through the veins, plugs the ducts and causes death. The sporodochia are found abundantly on the bases. Fig. 444.—F. lini, sketch, showing the mode of attack upon a young root tip of a seedling flax plant. After Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stevens, Frank Lincoln, 1871-1934. New York : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
