Journal of agricultural research . Journal of Agricultural Research Vol. VI, No.2 Citrus Canker Plate XI. Journal of Agricultural Research Vol. VI, No. 2 PLATE XI Fig. I.—Cankers on old grapefruit leaves which have enlarged during the secondgrowing season. Fig. 2.—Citrus canker resulting from immersion of leaves in a bacterial suspension.Lesions involving a large part of the lower leaf surface are thus formed. Fig. 3.—Culture of Phoma socia showing pycnidial formation in concentric rings. Fig. 4.—Dilution poured plate of Pseudomonas citri on green-bean agar. The spotson the colonies are the re
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Journal of agricultural research . Journal of Agricultural Research Vol. VI, No.2 Citrus Canker Plate XI. Journal of Agricultural Research Vol. VI, No. 2 PLATE XI Fig. I.—Cankers on old grapefruit leaves which have enlarged during the secondgrowing season. Fig. 2.—Citrus canker resulting from immersion of leaves in a bacterial suspension.Lesions involving a large part of the lower leaf surface are thus formed. Fig. 3.—Culture of Phoma socia showing pycnidial formation in concentric rings. Fig. 4.—Dilution poured plate of Pseudomonas citri on green-bean agar. The spotson the colonies are the reflection of the windows of the room in which the exposurewas made. Colonies 14 days old, the last 5 of which days the plates were kept in anice chest at a temperature of about 55°. Fig. 5.—Photomicrograph of pycnidium of Phoma socia taken in reflected simlight. Fig. 6.—Photomicrograph of pycnidia of Phoma socia taken in diffuse light. o ADDITIONAL COPIES OF TmS PUBLICATION MAT BE PROCUEED FROM THE SUPERINTENDENT OF DOCUMENTS GOVERNMENT PRINTING OFFICE ?WASHINGTON, D. C. AT 15 CENTS PER