. California plant diseases. Plant diseases. Bulletin 218] CALIFORNIA PLANT DISEASES. 1141 as a true parasite. This fungus occasionally causes a decay of the fruit of the orange, quite different from anything seen in the lemon. The wither-tip rot of the orange consists in a large, rather dry, brown spot, starting sometimes on fruit while on the tree during wet weather, and gradually spreading. These spots usually develop at places where oranges touch each other. The same spotting and decay is quite fre- quently found to a considerable extent in oranges held in cold storage, particularly if the
. California plant diseases. Plant diseases. Bulletin 218] CALIFORNIA PLANT DISEASES. 1141 as a true parasite. This fungus occasionally causes a decay of the fruit of the orange, quite different from anything seen in the lemon. The wither-tip rot of the orange consists in a large, rather dry, brown spot, starting sometimes on fruit while on the tree during wet weather, and gradually spreading. These spots usually develop at places where oranges touch each other. The same spotting and decay is quite fre- quently found to a considerable extent in oranges held in cold storage, particularly if the temperature is a little too low. Under such condi- tions this fungus may develop abundantly and cause a considerable amount of decay. Damping Off (Rhizoctonia, Fusarium). Figure 66. Causes the loss of great quantities of orange seedlings in the seed bed. The plants begin to die in spots which gradually extend, finally involving large areas if not checked. Two distinct forms of the disease are recognizable, one caused by the first named fungus above, producing a decay of the stem just above ground, while the other shows itself in dead spots on the stem at any point. These troubles can only be con- trolled by strict attention to proper methods of planting and watering. The seed bed should be constructed with an inch of clean, fresh sand on top, with heavier soil beneath. For the inexperienced grower, particu- larly, it is better to make fur- rows six inches deep and about a foot apart, planting the seed broadcast on the ridges between. The water may then be run in these furrOWS and allowed tO FlG< 66.—Damping off of orange seedlings. soak into the ground laterally, rather than being sprinkled on the surface. Where the seed is sown broadcast all over the surface of the bed and the water applied by sprinkling, watering should always be done in the morning and no oftener than is absolutely neces- sary. In many cases a good watering once a week is sufficient to keep the soil un
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