. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 27U. Juglans cinerea of the eastern states. 2712. The California Wild Walnut — Jufflans Californica (X ^4)- Walnut Bacteriosis, —Chief among the more serious diseases of Juglans regia in the United States is a bac- terial blight of the nut, branch and leaf of that tree. This blight now has its greatest developm
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 27U. Juglans cinerea of the eastern states. 2712. The California Wild Walnut — Jufflans Californica (X ^4)- Walnut Bacteriosis, —Chief among the more serious diseases of Juglans regia in the United States is a bac- terial blight of the nut, branch and leaf of that tree. This blight now has its greatest development along the Pacific coast, especially in Orange and Los Angeles counties, California. The germ which causes this dis- ease is a newly described species of Pseudomonas (P. jugiandis). Different effects of the disease are shown in Fig. 2714. The organism of Walnut bacteriosis winters in the fallen nuts, in the diseased tissues of affected branches, and especially in the pith cavity of the latter. New in- fections occur as soon as spring growth begins, taking place near the growing point of branches, in the open- ing leaves, and upon the young and tender nuts. The finer lateral veins of the leaves and the adjoining par- enchyma are destroyed, and the midrib is often af- fected. The injury resulting from infection of the branch will largely depend on the tenderness of the latter at the time and point of infection. If the tissue is tender a canker-like spot w^ill be eaten through to the pith, or the entire end of the shoot may be destroyed. If the nut is infected while small, its complete destruction usually follows, the digestive action of the germ involving hull, shell and kernel. Nuts infected early in the season mostly fall when small, while later infections frequently result only in the destruction of the hull and the black- ening of the outer layers of the shell, the tissues hav- ing become too hard for the further progress of the dis- ease. As in the case of pear blight
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