. The fungi which cause plant disease . Plant diseases; Fungi. 178 THE FUNGI WHICH CAUSE PLANT DISEASE species belonging to eighty-nine genera; one hundred forty-six more hosts, some doubtful, are reported. Among the economic host genera are Adonis, Alyssum, Anemone, Aquilegia, Brassica, Calendula, Catalpa, Clematis, Cucumis (?), Cucurbita (?), Dahlia, Daucus, Delphinium, Diervilla, Dipsacus, Fagopyrum, Lupinus, Lycopersicum, Medicago, Paeonia, Phaseolus, Pisum, Tragopogon, Trifolium, Verbena, Vicia, Scabiosa, Symphytum, Valeriana. This is the most variable species of this genus varying widely
. The fungi which cause plant disease . Plant diseases; Fungi. 178 THE FUNGI WHICH CAUSE PLANT DISEASE species belonging to eighty-nine genera; one hundred forty-six more hosts, some doubtful, are reported. Among the economic host genera are Adonis, Alyssum, Anemone, Aquilegia, Brassica, Calendula, Catalpa, Clematis, Cucumis (?), Cucurbita (?), Dahlia, Daucus, Delphinium, Diervilla, Dipsacus, Fagopyrum, Lupinus, Lycopersicum, Medicago, Paeonia, Phaseolus, Pisum, Tragopogon, Trifolium, Verbena, Vicia, Scabiosa, Symphytum, Valeriana. This is the most variable species of this genus varying widely in its every character. It includes several species which have by some been set aside as distinct, e. g., E. martii, E. umbelliferarum and E. liriodendri. Salmon ^ found that the conidia of this form grown on Trifolium pratense were unable to infect other species of Trifolium. E. cichoracearum D. C.^ Amphigenous; mycelium usually evanescent, rarely persistent, white or sometimes pink; perithecia gre- garious or scattered, 80-140 or rarely 180 /x; cells variable, often very distinct, 10-20 fi; appendages variable in nxmiber and size, some shade of brown; asci usually nu- merous, about 10-15, but varying from 4 to 36, variable in size and shape, narrowly ovate or subcylindric to broadly-ovate, more or less stalked, 58-90 x 30-35 fi; spores 2, rarely 3, 20-28 x 12-20 n. Conidiophores (=Oidium ambrosiae ThOm), short; conidia minute, elliptic, white, 4-5 x fi. The species is quite vari- able sometimes closely approaching E. polygoni. Cosmopolitan. The hosts are very numerous, among them being: Borago, Calendula, Centaurea, Cichorium, Clematis, Cucurbita, Dahlia, Helianthus, Humulus, Mentha, Nicotiana, Phlox, Tragopogon, Valeriana, Verbena, Symphytum. It is of especial import on composites and cucurbits. Reed ^ has made very extensive culture studies of this species. Fig. ^00 128.—E. cichoracearum, asci and spores. After Please note that these images are extracted f
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
