Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 140 Diseases of Economic Plants Scaly-bark {Cladosporium herharum Lk. var. dtricolum Faw.). — Small, circular, or oval, rusty-colored spots with well-defined margins, on both bark and fruit, characterize this disease. The bark cracks and forms scales. The spots are at first scattered, but in time coalesce and form large areas upon the branches and trunk, giving it a scaly appearance. Fig. 72. — Scaly-bark injury to fruit. After Stevens. Similar injury also occurs on the fruit (Fig. 72). Sweet

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Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 140 Diseases of Economic Plants Scaly-bark {Cladosporium herharum Lk. var. dtricolum Faw.). — Small, circular, or oval, rusty-colored spots with well-defined margins, on both bark and fruit, characterize this disease. The bark cracks and forms scales. The spots are at first scattered, but in time coalesce and form large areas upon the branches and trunk, giving it a scaly appearance. Fig. 72. — Scaly-bark injury to fruit. After Stevens. Similar injury also occurs on the fruit (Fig. 72). Sweet oranges are most affected, the fruit ripening prematurely. Top working is recommended, also heading back and painting the trunk and the stumps of the branches with carbolineum and water equal parts. Gummosis.— Several diseases recognized by the exuda- tion of gum from the trunks and branches of the trees are

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