Due to the large amount of rain in summer and autumn, high humidity, and typhoon, lemon trees grown in many places are infected with ulcers, and some are very serious. The branches, leaves, and even fruits are covered with ulcers. At present, the fruits have gradually matured into the picking stage. In order to reduce the risk of ulcer disease, ensure the safe wintering of branches and leaves, and reduce the incidence and damage of the next year, the lemon trees must be cleared in time to remove the diseased branches, diseased leaves, and diseased fruits to kill the bacteria. The specific approach is as follows: After the lemon trees have been harvested, the weeds, dead branches and deciduous fruits in the orchard are promptly cleaned, and at the same time the weak stems inside the canopy and the dried stems, branches and branches, overlapping branches, over dense branches, and drooping branches outside the crown are cut off. Short-cut fruit branches, fallen fruit branches, branches damaged by fruit picking and leggy shoots, and crazy branches. In particular, attention should be paid to cutting off branches that are ulcerated by ulcers, and buried or burned, and then spraying the inside and outside of the canopy once. 1:1 100 times Bordeaux mixture, or 800X 47% Chrysanthemum copper WP aqueous solution, or 1500X 46.1% copper hydroxide wettable powder aqueous solution, or 600X 20% aqueous copper thiobacillus suspension solution, or 1500X 33.5% quinoline copper suspension aqueous solution, or 1500 times 35% copper oxychloride copper wettable powder aqueous solution, after 15 to 20 days, spray a 0.8-1.2 bymide aqueous solution of lime sulfur uniformly inside and outside the crown to spray the canopy evenly. Inside and outside all the leaves. Within four hours after spraying, it should be flushed with rain, and should be re-applied again to improve the control effect and significantly reduce the occurrence of ulcer disease in the second year.
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