前言青果病是柑桔最严重的病害之一,已知有两种类型:一是热敏型,发生于非洲南部,在日气温高于30℃达数小时的炎热气候下,病状不表现;另一类型是耐热型,能耐受高温,发生于印度、中国(即柑桔黄龙病—译者注)、和东南亚。在沙特阿拉伯和北也门已分别发现亚洲耐热型和非洲热敏型青果病。由于非洲型和亚洲型青果病分别由南非 Introduction Green fruit is one of the most serious diseases of citrus. Two types are known: one is thermosensitive and occurs in southern Africa. The symptoms do not show in hot climates when the temperature is higher than 30 ° C for several hours. The other type is heat-tolerant and can withstand high temperatures occurring in India, China, and Southeast Asia. Asian heat-tolerant and African heat-sensitive green fruit diseases have been identified in Saudi Arabia and North Yemen, respectively. As the African-type and Asian-type green diseases are respectively from South Africa