. The diseases of crops and their remedies : a handbook of economic biology for farmers and students. Plant diseases. ROOT CROPS. 47 and sand to be put on the ground before sowing the seeds. The odour of the tar is so offensive to insects that they cannot endure soil impregnated with it. (2) Burn all in- fested leaves. Cure.—Dressing the land with gas-lime, soot, and lime, destroys the pupss of this pest. The Parsnip Fly {Psila rosm) has already been described in this chapter (see " Carrot Fly ").. Fig. 19.—Mildew of Paesnips (Peronospora nivea). A. A spotted parsnip. B. Coniaiophore
. The diseases of crops and their remedies : a handbook of economic biology for farmers and students. Plant diseases. ROOT CROPS. 47 and sand to be put on the ground before sowing the seeds. The odour of the tar is so offensive to insects that they cannot endure soil impregnated with it. (2) Burn all in- fested leaves. Cure.—Dressing the land with gas-lime, soot, and lime, destroys the pupss of this pest. The Parsnip Fly {Psila rosm) has already been described in this chapter (see " Carrot Fly ").. Fig. 19.—Mildew of Paesnips (Peronospora nivea). A. A spotted parsnip. B. Coniaiophore bearing ronidia (spores), x 107. C. Mature conidium dividing, x 334. D. Conidium after division. The formation of zoospores. B. Zoospore with cilia, x 331. X 331. The Parsnip Moths have already been described under the heading of " Carrot Moths " ; and for still fur- ther information, see Dr. Riley's Insect Life, vol. 1, p. 94. The Parsnip Mildew {Peronospora nivea, Fig. 19) lives within the tissues of the host-plant. The fun- gus iirst attacks the leaves, the hyphse of which soon. 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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