Citrus Black Spot is a fungal disease marked by dark, speckled spots or blotches on the rinds of fruit, citrus black spot is an economically significant citrus disease. It causes early fruit drop, reduces crop yield, and renders the highly blemished fruit unmarketable. While all commercial citrus cultivars are susceptible to citrus black spot, the most vulnerable are lemon and late-maturing citrus varieties like Valencia. Although disease symptoms are expressed clearest on the rinds of fruit, the risk of this disease spreading through fruit movement is minimal. The greatest risk of disease transmission is associated with the inoculum of fallen, decomposing citrus leaves.
Citrus black spot occurs in subtropical regions of the world with summer rainfall. The disease has been found in Argentina, coastal areas of Australia, Brazil, China (mainland and Hong Kong), Indonesia, Japan, Kenya, Mozambique, Nigeria, Peru, Philippines, areas of South Africa with summer rainfall, Swaziland, Taiwan, Uruguay, Venezuela, and Zimbabwe.
Federal Quarantine Notices and Federal Order
Other Citrus Diseases
Angela McMellen Brannigan
National Policy Manager