. Cirtus fruits under irragation. Citrus fruits; Fruit-culture. 1 01 rTTRim FRTTTTR §20 & 9Q o TM HTTTP-rnAC^T CJTATPQ op; does not penetrate to the wood, but is confined to the outer tissue of the bark. Citrus canker may be confused with scaly bark, scab, and anthracnose. However, it differs from scab in that the spots are more round, and are larger in size; the spots are white or gray in color, and the leaves are not distorted or covered with wartlike projections, as is common in an infection of scab. Citrus canker differs from scaly bark in that the spots are not so large and are more c
. Cirtus fruits under irragation. Citrus fruits; Fruit-culture. 1 01 rTTRim FRTTTTR §20 & 9Q o TM HTTTP-rnAC^T CJTATPQ op; does not penetrate to the wood, but is confined to the outer tissue of the bark. Citrus canker may be confused with scaly bark, scab, and anthracnose. However, it differs from scab in that the spots are more round, and are larger in size; the spots are white or gray in color, and the leaves are not distorted or covered with wartlike projections, as is common in an infection of scab. Citrus canker differs from scaly bark in that the spots are not so large and are more circular in outline. Also, the infected areas are spongy, whereas scaly-bark spots are usually hard and glazed in appearance. Spotting due to citrus canker differs from spotting due to anthracnose in that anthracnose spots are sunken and are usually many times larger and much firmer and more compact. Also, anthracnose occurs only on the fruit and does not attack the twigs. The organism causing the disease has not been determined, but it is probably due to a fungus. The disease is infectious, as has been shown by the results of some experiments. The disease developes rather slowly, but when a spot once forms it becomes a center from which infection spreads to surrounding tissue. 20. Citrus canker when once introduced into a locality, may be expected to spread rapidly. For this reason preventive measures against the disease are most important. The intro- duction of infected nursery stock in either new or old groves should be avoided. Only young trees that are known to be free from disease should be planted. Young groves should be inspected from time to time for the appearance of the disease. The diseased areas develop in early spring or throughout the summer, but they will be more prominent in late spring and in autvimn. If infected trees are found they should be removed and burned without delay. Trees 2 or 3 years old may be cut back severely, just enough being left to save the
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