. The diseases of crops and their remedies : a handbook of economic biology for farmers and students. Plant diseases. MISCELLANEOUS CRQPS. 157 The larvsB of this moth (already described) feed on the roots of lettuces. The Lettuce Mildew {Peronospora ganglioniformis, Fig. 61) produces pallid patches on lettuce leaves, and " in bad cases summer lettuces are quickly reduced to pu- trescent ; The conidiophores of this fungus are. Fig. 51.—Lettuob Mildew {Peronospora ganglioniformis). A. A oonidiophore and conidia. B. Oospores (resting-spores). X 195 diam. (Zeiss's C. and 3 oc). fl
. The diseases of crops and their remedies : a handbook of economic biology for farmers and students. Plant diseases. MISCELLANEOUS CRQPS. 157 The larvsB of this moth (already described) feed on the roots of lettuces. The Lettuce Mildew {Peronospora ganglioniformis, Fig. 61) produces pallid patches on lettuce leaves, and " in bad cases summer lettuces are quickly reduced to pu- trescent ; The conidiophores of this fungus are. Fig. 51.—Lettuob Mildew {Peronospora ganglioniformis). A. A oonidiophore and conidia. B. Oospores (resting-spores). X 195 diam. (Zeiss's C. and 3 oc). flattened and slightly twisted (Mg. 51 A). Each terminal branch has a cup-like expansion bearing on minute spicules from three to five conidia. The conidia germinate upon the leaves and give rise to mycelia within and upon the host-plant. Like Peronospora parasitica and other species of the Peronosporece, the lettuce mildew produces oospores (Fig. 51 B) which hibernate " in the old rotting. 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 Griffiths, A. B. (Arthur Bower), 1859-. London : G. Bell
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Keywords: ., bookauthorgriffith, bookcentury1800, bookdecade1890, bookyear1890
