Florida Agricultural Experiment Station


of the young shoots and twigs. When first formed, they occur
as pale, greenish-yellow to yellowish areas varying greatly in
size. In some cases the spots cover an area of only 1/4 to 1/2


 IAJ~ I 1


 Fig. 91.-Lightning injury on citrus twigs, showing the char-
 acteristic spots resulting from the injury.
inch in diameter, while in others the entire surface of the twigs
may be affected for a distance of three or four inches. The leaf
and leaf-stalk or bud and thorn may remain apparently unin-
jured in such cases. Spots are often seen encircling the base
of the leaf-stalk and, in cases where virtually the entire sur-
face of the green twig is affected, the green leaf-stalks and leaves
or the green buds and thorns stand out in marked contrast
against the discolored areas (Fig. 91). After a time, the spots
or blotches become yellowish-brown and are raised above the sur-