1991年平远县茅坪乡长窝里沙田柚基地有10多亩沙田柚出现较为严重的幼果畸形、黄化现象,到5月10日因此而引起的落果已达20％～30％。其主要症状是:发病初期幼果生长发育不良,果皮出现灰白色肿斑,随着果实增大肿斑迅速扩展,果皮出现瘤状突起,白皮层有褐色胶状物,有的出现凹陷破裂并变黑。切开病果,可见果实表皮下组织初为乳白色水渍状,干燥后成黄褐色胶状物累积。其发生特点是发 In 1991, Pingyuan County, Maoping Township, Long nest nest Shatian pomelo base has more than 10 acres of Shatian pomelo more serious juvenile deformities, yellowing phenomenon, to May 10 caused by the fall has reached 20% to 30%. The main symptoms are: the early onset of young fruit growth and development of malformations, the skin appears gray-white swollen spots, with the rapid expansion of the fruit swollen spots, the tumor appeared prominence, the white cortex of brown jelly, and some depression collapse and change black. Sliced ​​disease, the fruit can be seen at the beginning of the subepidermal milky white water stains, dried into amber-like jelly accumulation. Its occurrence is hair