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肯尼亚的柑桔总面积约有20000公顷,其中甜橙占70％,来檬12％,柠檬9％,宽皮桔5％,葡萄柚4％。1981～1983年Seif等对肯尼亚柑桔主产地的柑桔病害进行了调查鉴定,结果表明病害种类很多,一些新病害系首次发现,其中以柑桔青果病(greening)分布最广,危害最重。在海拔800米以上的高原地区的所有果园几乎都有发现,且与众所周知的虫媒非州木虱[Trioza erytreae(Del Guercio)]的分布范围相一致。这种虫媒存在与否是确定青果病是否存在的界线。
The total area of oranges in Kenya is about 20,000 hectares, of which 70% are oranges, 12% for lemons, 9% for lemons, 5% for broad-skinned oranges and 4% for grapefruit. From 1981 to 1983, Seif et al investigated and identified citrus diseases in the main producing areas of Kenyan citrus. The results showed that there were many kinds of diseases and some new diseases were found for the first time. Among them, greening was the most widely distributed and most harmful . Almost all of the orchards in the Altiplano at altitudes above 800 meters have been found and are consistent with the well-known range of Trioza erytreae (Del Guercio). The presence or absence of such a pest is the defining line for the existence of the fruit disease.