. Cirtus fruits under irragation. Citrus fruits; Fruit-culture. 42 CITRUS FRUITS UNDER IRRIGATION §25 hauling the fruit to the packing house and in all grading and other packing-house operations. Formerly much California fruit was lost by decay in transit, but in recent years more careful handling has been practiced and as a result there is very little fruit lost in transit. 52. Gray Mold.—Gray-mold fungus produces a dark- colored decay of the rind of lemons, and on this decay a dirty gray mold forms. The fungus can develop at temperatures close to freezing and occasionally causes loss in frui
. Cirtus fruits under irragation. Citrus fruits; Fruit-culture. 42 CITRUS FRUITS UNDER IRRIGATION §25 hauling the fruit to the packing house and in all grading and other packing-house operations. Formerly much California fruit was lost by decay in transit, but in recent years more careful handling has been practiced and as a result there is very little fruit lost in transit. 52. Gray Mold.—Gray-mold fungus produces a dark- colored decay of the rind of lemons, and on this decay a dirty gray mold forms. The fungus can develop at temperatures close to freezing and occasionally causes loss in fruit in cold. Fig. 37 storage, but usually it is not considered to be a serious trouble. Fortunately it usually develops only on weak fruits that have been injured or are overripe and is sometimes found on fruits that have been only slightly injured by frost. This is the same fungus that may cause one of the forms of lemon gummosis. 53. Black Rot.—Occasionally in seasons of heavy early rainfall a disease known as black rot, or navel rot, becomes rather abundant, but usually the trouble is not serious. It is navel oranges that are affected; they color prematurely in §25 CITRUS FRUITS UNDER IRRIGATION 43 the fall, and there develops a dry black rot in the tissues at the navel end. The rot does not spread very rapidly and often remains confined to one section of the orange. Fig. 38 illus* trates an orange affected with black rot. The loss is usually not very great, rarely exceeding 5 per cent, of the crop. 54. Red Rot.—Red rot is a disease that is frequently found on lemons in the curing house. The rind of the lemon becomes a bronze, rusty color and gradually dries, leaving a sunken area on the fruit. The sunken area is dark red in color or sometimes black. The true cause of the disease is unknown, but it is thought by some to be associated with slight sun burning and by others to be due to a weakness of the fruit caused by an improper condition of growth at the time the frui
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