Incidence of Tristeza and Other Citrus Diseases in Bolivia. L. W. Timmer, Associate Professor, Institute of Food and Agricultural Sciences, Agricultural Research and Education Center, University of Florida, Lake Alfred, 33850. Ralph Scorza, Assistant Research Scientist, Department of Fruit Crops, University of Florida, with the U.S. Agency for International Development, La Paz, Bolivia; and R. F. Lee, Assistant Professor, Institute of Food and Agricultural Sciences, Agricultural Research and Education Center, University of Florida, Lake Alfred. Plant Dis. 65:515-517. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-515.

Citrus tristeza virus was detected serologically in more than 75% of the citrus trees tested in the Chapare and Santa Cruz areas of Bolivia, in more than 40% of the trees tested in the Yungas, and was also detected in the Alto Beni. Toxoptera citricida, an efficient aphid vector of the disease, was observed in the first three areas. Symptoms on naturally infected limes were generally mild. Phytophthora foot and root rot was the most serious disease in the Chapare and in the Yungas. Pink disease and Septoria leaf spot were important in the Yungas, and areolate leaf spot was serious in the Chapare. Melanose, greasy spot, scab, lime anthracnose, exocortis, xyloporosis, and psorosis were observed but were not of economic importance. Bacterial canker was not observed in the Yungas or in the Chapare.