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我所无核蜜桔遭受1972年二月严重冰冻之后,树脂病的危害普及整个果园,随机取样调查225株就有178株发病,发病率高达83.1％,使蜜桔产量由1971年17万余斤降到1.7万斤,去冬今春因病死去两株,尚有11株接近死亡,病的危害程度已十分严重. 据观察:该病在我所是三、四月份开始发生,六、七月份流行盛期,尤以元月份病害扩展较快,危害较重,九月又有一个小流行盛期出现。病前侵入的途径主要是冻伤、虫伤和人
After suffering from serious freezing in February 1972, the harm of resinous disease popularized the entire orchard. There were 178 strains of 225 strains randomly sampled and the incidence rate was as high as 83.1%. The output of tangerines was increased from 170,000 in 1971 Kg down to 1.7 kg, due to illness last winter to die two, there are still 11 close to death, the extent of the disease has been very serious.It is observed that the disease began in March and April, six, seven The peak of the lunar new year, especially in January January disease spread faster, more damaging, there is a small epidemic peaked in September. Pre-invasion pathways are mainly frostbite, insect pests and humans