. Diseases of flowers and other ornamentals. Flowers; Plant diseases. 52 California Agricultural Extension Service LCir- 118 specialized strains will not attack other hosts. For further details see under "Narcissus" (p. 43) and "Nematodes" (p. 82). The only control is to destroy affected plants. PHOTINIA, HETEROMELES, OR TOYON Fire Blight, Blight.—When infected with the fire-blight bacterium, Erwinia amylovora, twigs or branches of photinia (Christmas berry),. Fig. 19.*—Leaf -miner effect on photinia. The stem injury is often mistaken for a fungus canker. die with a witheri
. Diseases of flowers and other ornamentals. Flowers; Plant diseases. 52 California Agricultural Extension Service LCir- 118 specialized strains will not attack other hosts. For further details see under "Narcissus" (p. 43) and "Nematodes" (p. 82). The only control is to destroy affected plants. PHOTINIA, HETEROMELES, OR TOYON Fire Blight, Blight.—When infected with the fire-blight bacterium, Erwinia amylovora, twigs or branches of photinia (Christmas berry),. Fig. 19.*—Leaf -miner effect on photinia. The stem injury is often mistaken for a fungus canker. die with a withering of the leaves as in pear blight. Cutting out may be practiced as in the treatment described for cotoneaster on page 17. Heavy watering should be avoided up to blossom time. Leaf Blight, Leaf-Miner Effect.—The leaves are sometimes marked with lines and bands of white, scabby tissue. This is caused by very small maggots which feed between the two surfaces of the leaf. The bark of green shoots is also attacked (fig. 19). For control see the last sec- tion under this 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 Smith, Ralph E. (Ralph Eliot), 1874-1953. Berkeley, Calif. : College of Agriculture, University of California
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Keywords: ., bo, bookcentury1900, booksubjectflowers, booksubjectplantdiseases
