. Cirtus fruits under irragation. Citrus fruits; Fruit-culture. Fig. 3 over the sides of the fruit, where they germinate and cause the discoloration. This discoloration usually begins any time after the fruit begins to color. The control measures recommended for anthracnose will also prevent tear streaking. 8. Verrucosis.—The disease known as verrucosis, or scab, affects the fruit and leaves and sometimes the tender shoots. It is caused by a minute ]3arasitic fungus that grows in the tissue of the part attacked. The fungus grows from a spore, or seedlike body, about the shape of a grain of whe
. Cirtus fruits under irragation. Citrus fruits; Fruit-culture. Fig. 3 over the sides of the fruit, where they germinate and cause the discoloration. This discoloration usually begins any time after the fruit begins to color. The control measures recommended for anthracnose will also prevent tear streaking. 8. Verrucosis.—The disease known as verrucosis, or scab, affects the fruit and leaves and sometimes the tender shoots. It is caused by a minute ]3arasitic fungus that grows in the tissue of the part attacked. The fungus grows from a spore, or seedlike body, about the shape of a grain of wheat, but it is so small that it is invisible to the unaided eye. Filaments grow out UN Lr u Ll^-UOAS1' vS FATES from these small spores and penetrate the epidermis of the fruit or leaf and injure the growing tissue. The fungus attacks the sour orange and the lemon most severely and frequently causes the fruit to grow misshapen and unsightly. Sometimes the fungus manifests itself the same way on the Satsuma orange, though less frequently. Corky pro- jections that range in color from dark gray to tan extend out from the surface, giving the fruit a warty appearance. In Fig. 4 is shown an immature grapefruit that has been affected with scab. The corky projections are visible in the illustration. Between these corky projections the skin retains its normal color. Often these irregular corky projections coalesce and form a large raised corky scab. The attacks of this fungus are less severe on the grapefruit and the tangerine than on the sour orange and the lemon, and rarely is the sweet orange attacked. In less severe attacks, es- pecially when the disease is on grapefruit, in place of the warty projections the fungus manifests itself in more or less raised flat patches, the surface of which will be lightly scabbed. These raised areas are variable in size and shape. The disease also affects both surfaces of the leaves just as they are unfolding and can be detected by the minute light
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Keywords: ., bookcentury1900, booksubjectcitrusfruits, booksubjectfruitcultur
