. Fig. 67.—Walnut blight on young nuts. Many nuts fall prematurely, but others which reach full size are more or less blackened and destroyed (fig. 70), both as to the husk and shell and the kernel within. The injury to the tree from this disease, caused by Phytomonas juglandis, is much less serious than the loss of crop. Control of walnut blight has been obtained by spraying the trees with bordeaux mixture wheji the first leaves and catkins are partially devel- oped but before many of the rudimentary young nuts have appeared. The 8-4-50 formula (p. 156) has been recommended for California as
. Fig. 67.—Walnut blight on young nuts. Many nuts fall prematurely, but others which reach full size are more or less blackened and destroyed (fig. 70), both as to the husk and shell and the kernel within. The injury to the tree from this disease, caused by Phytomonas juglandis, is much less serious than the loss of crop. Control of walnut blight has been obtained by spraying the trees with bordeaux mixture wheji the first leaves and catkins are partially devel- oped but before many of the rudimentary young nuts have appeared. The 8-4-50 formula (p. 156) has been recommended for California as a whole, but under conditions less favorable to the development of the disease, a spray of half this strength sometimes gives good control. A 32 Pqj. fuller discussion of this disease, see: Eudolph, B. A. Bacteriosis of the English walnut and its control. California Agr Exp. Sta. Bui. 564:1-88. 17 figs. 1933. (Out of print.) Iludol})h, B. A. A new blight control spray. Red cuprous oxide. Diamond Walnut News: 22(2). 4 p. California Walnut Growers' Association, Los Angeles. 1940.
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