. Cirtus fruits under irragation. Citrus fruits; Fruit-culture. 6^ Lxiii^UD Visurjis. \jmiiwiN vj ^o the base of the tree. Preventive measures against this disease consist in planting trees that have been budded on sour stock. The remedy after a tree is attacked by the disease is to dig up the soil about the base of the tree and after removing the diseased parts, disinfect the wounds. In Florida, strong, thick Bordeaux mixture applied with a brush has been found to be satisfactory for this purpose. The instrviment used for cutting the diseased parts should also be disinfected.
. Cirtus fruits under irragation. Citrus fruits; Fruit-culture. 6^ Lxiii^UD Visurjis. \jmiiwiN vj ^o the base of the tree. Preventive measures against this disease consist in planting trees that have been budded on sour stock. The remedy after a tree is attacked by the disease is to dig up the soil about the base of the tree and after removing the diseased parts, disinfect the wounds. In Florida, strong, thick Bordeaux mixture applied with a brush has been found to be satisfactory for this purpose. The instrviment used for cutting the diseased parts should also be disinfected. 41. Exanthema.—Exanthema, or Florida die-back, is a disease caused by improper fertilization. The branches die back from the ends and the bushy tufts of small twigs form all through fhe top of the tree. In addition, corky outgrowths form on the bark of twigs and from these outgrowths gum exudes. About the first symptoms of the disease is the develop- ment near the center of the tree of oversized dark green leaves. The fruit becomes a pale yellow color while still small, and as it matures it fails to develop much acidity and is insipid to the taste. The rind becomes marked with characteristic brown or black spots, which vary in size from ys i^^^ ^^ patches covering the whole fruit. The fruit splits easily, and usually through the spots. Fig. 33 shows fruit spotted and cracked by reason of this disease. ! In California, the disease is found most often in groves planted on coarse, gravelly soils, or on soils underlaid by gravelly subsoils that have been heavily fertilized with stable manure or some form of organic commercial fertilizer such as tankage or cottonseed meal. The disease is most likely to occur if the trees have been suffering for the want of plant- food and have been alternately too wet and too dry through improper irrigation practices. The remedy is to keep up the plant-food supply in the soil, and irrigate in a manner to main- tain the moisture of the soil about u
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