. California fruits and how to grow them. Fruit culture. Diseases not Traceable 406 California Fruits be assisted to maintain clean, health)- l)ark. This is accomplished by the use of the lime, salt and sulphur mixture already prescribed for scale insects. It can also be done by winter spraying with caustic soda or potash, une ]iound to six gallons of water. bacterium, has so far resisted treatment. The is recognized by black sunken spots on the hull of the young walnut; gen- erally worst at the blossom end and usually first seen there early in the season; later the s])ots run togethe
. California fruits and how to grow them. Fruit culture. Diseases not Traceable 406 California Fruits be assisted to maintain clean, health)- l)ark. This is accomplished by the use of the lime, salt and sulphur mixture already prescribed for scale insects. It can also be done by winter spraying with caustic soda or potash, une ]iound to six gallons of water. bacterium, has so far resisted treatment. The is recognized by black sunken spots on the hull of the young walnut; gen- erally worst at the blossom end and usually first seen there early in the season; later the s])ots run together and encompass consid-. Effect of brown rot on fruit and twigs of apricots. Ulights .\ni) —There are several lilights which are traceable to bacteria, para- sitic growths which are not discernible as are the fungi, and not usually amenable to spray treatment, because they exist wholly within the tissues of the plant and are not reached by applications. The blights of the pear, the black heart of the apricot, the olive tuberculosis, etc., are instances. Cut- ting back to healthy wood (with tools dipped after each cut in corrosive sublimate, one part to one thousand parts of water), and burning all removed parts is the best treat- ment which can at present be prescribed. The walnut blight, demonstrated by Newton I'.. Pierce, of Santa .\na, to be caused bv a crable areas of the surface. As the disease ]jrogresses the nut is transformed into a hateful black mass and is utterly destroyed. The disease also affects the leaves and young- wood. The recourse seems to be toward re- sistant varieties, as stated in the chapter on the walnut. Lemon I\ot. a fungus disease destructive to the fruit in the orchard and during cnring or in trai-isit, is fully expounded in Bulletin }i)0 (if the L'niversity Experii-nent Station. XOT TRACEABLE To PARASITIC GROWTHS. 'inhere are a number of proininent troubles which are not traceable to parasitic invasion. Please note that these im
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