Title: Diseases of flowers and other ornamentals
Identifier: diseasesofflower118smit (find matches)
Year: 1940 (1940s)
Authors: Smith, Ralph E. (Ralph Eliot), 1874-1953
Subjects: Flowers; Plant diseases
Publisher: Berkeley, Calif. : College of Agriculture, University of California
Contributing Library: University of California, Davis Libraries
Digitizing Sponsor: University of California, Davis Libraries

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54 California Agricultural Extension Service (Cm. 118 Control of Photinia Troubles.—This popular native shrub often pre- sents a very sorry appearance on account of fungus and insect attacks. Extension Circular 87 recommends spraying with nicotine for pests like miner and thrips. This can be combined with lime-sulfur or bordeaux mixture for fungus diseases. It is suggested that bushes which are in
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Fig. 21.—Scab on photinia leaves. bad condition be thoroughly pruned in winter to remove all dead or weak wood and foliage. They should then be sprayed just before bloom- ing with bordeaux mixture 5-5-50 (p. 97), to which is added % pint of 40 per cent nicotine sulfate solution (Black Leaf 40). Lead arsenate may also be added for leaf-eating insects. It is of course not necessary to use the bordeaux mixture if spraying for insects alone. PINE Blister Rust.—The presence of this disease in pine trees is usually indi- cated by a browning of the needles, either on individual branches or on the whole crown. Closer inspection shows the typical cankers which are responsible for the death of the needles. A swelling of the bark appears, either on a branch or on the main trunk. White blisters develop on the surface of these swellings; these rupture and disclose masses of orange- yellow spores. Pitch flows abundantly from the cankers. This fungus,

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