The California fruits and how to grow them; . Cutting back tohealthy wood (with tools dipped after each cut in corrosive subli-mate, one part to one thousand parts of water), and burning allremoved parts is the best treatment which can at present be pre-scribed. The walnut blight, demonstrated by Newton B. Pierce, of SantaAna, to be caused by a bacterium, has so far resisted treatment. Thedisease is recognized by black sunken spots on the hull of the youngwalnut; generally worst at the blossom end and usually first seenthere early in the season; later the spots run together and encompassconsid
The California fruits and how to grow them; . Cutting back tohealthy wood (with tools dipped after each cut in corrosive subli-mate, one part to one thousand parts of water), and burning allremoved parts is the best treatment which can at present be pre-scribed. The walnut blight, demonstrated by Newton B. Pierce, of SantaAna, to be caused by a bacterium, has so far resisted treatment. Thedisease is recognized by black sunken spots on the hull of the youngwalnut; generally worst at the blossom end and usually first seenthere early in the season; later the spots run together and encompassconsiderable areas of the surface. As the disease progresses the nutis transformed into a hateful black mass and is utterly disease also affects the leaves and young wood. The recourseseems to be toward resistant varieties, as stated in the chapter onthe walnut. Lemon Rot, a fungus disease destructive to the fruit in theorchard and during curing or in transit, is fully expounded in Bul-letin 190 of the University Experiment Crown knot on peach just below ground. DIEBACK AND GUM DISEASE 5S3 DISEASES NOT TRACEABLE TOPARASITIC GROWTHS There are a number of prominent troubles which are not trace-able to parasitic invasion of any kind, and yet may be in some casespromoted by bacterial growth invited by preceding conditions. Sour Sap.—There is a fermentation of the sap, quite noticeableby its odor, which may be found in all parts of the tree, from theroot to the topmost twigs; sometimes in one part and not in sap in the root is generally due to standing water in the soil,and the remedy is drainage. Trees thus affected make an effort togrow and then the young growth shrivels. Severe cutting back ofthe top to reduce evaporation until the roots can restore their feed-ing fibers is the only treatment of the tree, and its success dependsupon the extent of the root injury. Sour sap may also be caused inthe branches by the occurrence of frost after the sap f
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfruitculture, bookyea
