01714naa a2200253 a 450000100080000000500110000800800410001902200140006010000210007424501680009526000090026352009730027265000240124565000130126965300100128265300120129270000150130470000150131970000190133470000230135370000190137670000180139577300470141316341152023-05-31       1995    bl uuuu     u00u1 u    #d  a0191-29171 aROCHA-PENA, M.A.  aCitrus tristeza virus and its aphid vector toxoptera citricidabThreats to citrus production in the Caribbean and Central and North America.h[electronic resource]  c1995  aCitrus is a major crop in terms of nutrition and the generation of employment and commerce. More than 400,000 ha of citrus are distributed throughout Mexico. In the United States, there are almost 500,000 ha of citrus, mostly in Florida, texas, Arizona, and California. the citrus industries of the Caribbean Islands, Central America, mexico, and the United States reprersent more than 1.1 million hectares (60). Tristeza disease of citrus, caused by citrus tristeza virus (CTV), a closterovirus, occurs in most citrus-producing areas of the world and is the most economically important viral disease of citrus (4,6,31,32). The most important vector of CTV is the brown citrus aphid, Toxoptera citricida (Kirkaldy) (Kirkaldy) (BrCA). Due to the recent outbreaks of the BrCA and the spread of severe strains of CTV, tristeza now theatens an estimated 185 million citrus trees grafted on sour orange (Citrus aurantium L.) rootstock in the Caribbean Basin countries (60).  aCitrus Aurantifolia  aEpidemia  aAphid  aDoencas1 aLEE, R. F.1 aLASTRA, R.1 aNIBLETT, C. L.1 aOCHOA-CORONA, F.M.1 aGARNSEY, S. M.1 aYOKOMI, R. K.  tPlant Diseasegv.79, n.5, p.437-445, 1995.