顽固病系一种称作SpiropLasmaCitri的菌质体所引起。已知叶蝉能传播该病。此病已遍及美国的大多数柑桔园。虽然顽固病通常不会导致植株死亡,但它能使果实产量大大地减少。据报导,经石灰水处理的植株,能减少蓟马和叶蝉的飞落。试验的三种处理是:二种石灰水混合处理和一种内吸性杀虫剂处理,并附设一个对照区处理:即①9.7％高岭石加0.3％蒙脱石,②5％熟石灰;内吸杀虫剂系甲拌磷,每公顷喷布甲拌磷有效成分3.6公斤。石灰水处理大约是每隔一周进行一次;甲拌磷则在传播 Stubble is caused by a bacterial species called SpiroplasmaCitri. Leafhoppers are known to transmit the disease. The disease has spread to most citrus groves in the United States. Although stubborn disease does not usually lead to plant death, it can greatly reduce fruit yields. It has been reported that lime-treated plants can reduce the flies and thrips of thrips and leafhoppers. The three treatments tested were: two limewater mixed treatments and one systemic insecticide treatment with a control zone attached: ①9.7% kaolinite plus 0.3% montmorillonite, ②5% hydrated lime; Department of insecticides within the phorate, spraying per hectare phorate effective component 3.6 kg. Lime water treatment is done about once every other week; phorate is spreading