. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECT! 337 be seen, therefore, that many symptoms of the disease as described in California are more or less identical with Clasterosporium car- pophilum (Lev.) Aderh., as described by McAlpine1 in Australia. It also occurs in According to Smith, the fungus could not be mistaken for a simple hyphomycete, as shown by the ag- gregate conidiophore production (Fig. 160). The conidial stage of the fungus is produced both on leaves and shoots, the pustules appearing a
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECT! 337 be seen, therefore, that many symptoms of the disease as described in California are more or less identical with Clasterosporium car- pophilum (Lev.) Aderh., as described by McAlpine1 in Australia. It also occurs in According to Smith, the fungus could not be mistaken for a simple hyphomycete, as shown by the ag- gregate conidiophore production (Fig. 160). The conidial stage of the fungus is produced both on leaves and shoots, the pustules appearing at the center of the spots. The)' are, however, not readily observed, since the spots on young shoots are often sterile and those upon the leaves may fall out before the production of spores. Perhaps the most unfortu- nate phase of this disease is kill- ing of winter buds, which of course greatly destroys the vitality with respect to fruit production the fol- lowing season. It is quite probable that this fungus is the same as Helminthosporiiim carpophilum (Lev.), and this is also the view of McAlpine. Control. In controlling this dis- ease, it has become evident that winter spraying is essential. The disease is reported to make its appearance early in January in Cal- ifornia, and generally somewhat prior to the activity of the winter buds. The spraying which may be given for. prevention of leaf curl is ordinarily too late for the best results upon this blight fungus. It is recommended, therefore, that an additional spraying in Cali- fornia be given in November or December to assist in controlling this blight organism. If a single spraying only can be given, it is perhaps best to give it in December, but later than early January under California conditions is Fig. 160. Coryneum Beijerinckii (After R. E. Smith) 1 McAlpine, D. Fungous Diseases of the Stone Fruits in Australia, and Their Treatment. 1902. 2 Trabut, L. Le Coryneum. Maladies des arbres a noyaux. Built agr
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