1968年冬—1969年春,湖南省柑桔产区因遭冰冻袭击,在管理不善、树势衰退的桔园里,引起严重的树脂病害。为了尽快控制其蔓延,消灭其危害,两年来湖南省农业科学院广大园艺工人、革命干部和科技人员,开展群众性科研活动,进行了刮治病斑和直接涂药的多种药剂试验。实践证明:采用病部连续直接涂抹食用浓碱水1:2—4(即1斤食用碱加 The winter of 1968 - the spring of 1969, citrus producing areas in Hunan Province due to the freezing attack, in the poor management, tree recession in the orange garden, causing serious resin disease. In order to control its spread as soon as possible and eliminate its harm, the majority of horticultural workers, revolutionary cadres and scientists and technicians of Hunan Academy of Agricultural Sciences in the past two years carried out mass scientific research activities and carried out experiments on various medicaments for scraping and treating spots and direct application. Practice has proved that the continuous use of the disease directly coated edible concentrated alkali 1: 2-4 (that is, 1 kg of edible alkali plus