. The Cuba review. THE CUBA REVIEW. 19 orchard of rust mites for the season, but if heavy rains occur the spraying will need to be repeated, and a constant watch should be kept for signs of the mites upon the leaves or for discoloration of the fruit. Foot Rot.—This is a disease affecting citrus trees at the junction of the trunk and roots. It usually occurs in wet, heavy lands. Cultivation and drainage help to remedy it and the use of sour orange or trifoliate stock will largely prevent its ap- pearance. Twig Gummosis or Die-Back Gummosis. —Wihere the soil is in a bad condition, dry and lackin
. The Cuba review. THE CUBA REVIEW. 19 orchard of rust mites for the season, but if heavy rains occur the spraying will need to be repeated, and a constant watch should be kept for signs of the mites upon the leaves or for discoloration of the fruit. Foot Rot.—This is a disease affecting citrus trees at the junction of the trunk and roots. It usually occurs in wet, heavy lands. Cultivation and drainage help to remedy it and the use of sour orange or trifoliate stock will largely prevent its ap- pearance. Twig Gummosis or Die-Back Gummosis. —Wihere the soil is in a bad condition, dry and lacking in humus, the twigs and young branches of citrus trees will often die back. This is not the Florida die-back, but is a physiological disease and may be remedied by correcting the condition of the soil. The restoration of humus and the use of potash and phosphoric acid fertil- izers are recommended. —Warts on lemons and other cit- rus fruits are due to a fungous diease known as scab and may be prevented by spraying with Bordeaux mixture or ammoni- acal copper carbonate while the fruit is small. Blight.—This is little known in Cuba, but a few cases have been observed which were probably identical with the Florida blight which has been so destructive. A part or the whole of a tree dies back suddenly without shedding its leaves. The cause of the trouble is not understood, but where it occurs the recommendations made in Flor- ida should be followed, i. e., THE TREE SHOULD BE DUG UP AND BURNED. A bulletin which is soon to be issued in English and Spanish by the Estacion Cen- tral Agronomica will treat, of all these citrus troubles in detail, giving descriptions of the insects and fungi causing them as well as carefully prepared directions and formulas for their treatment. This bul- letin, like all the publications of the Esta- cion, will be sent free to any resident of Cuba who applies for it. As far as the supply permits, the publications of the sta- tion will also b
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