This disorder was found affecting ten among 2,000 two and one-halfyear-old Valencia sweet orange [Citrus sinensis (L.) Osb.] trees on Rough lemon [C. limon (L.) Burm. f.] rootstocks. All trees were examined and found normal at time of planting. The abnormality is limited to the Valencia portion of the tree; Rough lemon trunks and sprouts are not affected. Trunk symptoms consist of eruptive galls, to 1% in. in diameter, that cover the bark from bud union to scaffold branches (Fig. 1,C). A necrotic cone-shaped peg underlies each gall, extending into the wood for a distance of 5 to 1 in. (Fig. 1,B). When the bark is removed from an affected trunk, the woody cylinder shows a brown-colored cavity underneath each gall (Fig. 1,A). According to Dr. M. T. de Vasconellos (personal communication), the same trouble is common in the Dominican Republic on seedling orange trees.Under greenhouse conditions in Florida, affected buds produce leaves that are twisted and show a large, faintly chlorotic area within the basal
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