Litchi and longan stem cancer are also known as canker diseases. They mainly damage the trunks of the litchi and longan and the branches inside the canopy. There are pods on the trunks and branches. When they are gently toggled by hand, they fall off and the trunk and branches are damaged. Severe recession, it is difficult to attack a strong autumn shoots, weak flower spikes, fruit set, fruit thin, not full, fruit color is light, poor quality. Litchi and longan stem cancer have rapid onset in the growing seasons of litchi and longan, spreading rapidly, germs prone to grow, and have strong resistance to drugs, especially when the rainwater is heavy and the humidity is high. If prevention and treatment are conducted in the winter, the bacteria can be completely killed. When the temperature rises in the spring, no pathogenic bacteria are propagated, which reduces the incidence of diseases and has a multiplier effect.
Specific control methods During the winter, the interior of the canopy was sprayed 2-3 times with 600 times 20% aqueous solution of copper thiazolysin, or 1000 times with 47% aqueous copper hydroxide solution, or 600 times with 20% aqueous solution of quinoline copper, or 0.8 - 1 Baume degree An aqueous solution of lime sulfur, or a 1:1:100 Bordeaux mixture, is sprayed every 10-15 days to evenly spray all the branches and trunks inside the crown to start dropping drops of water.
In addition, in the winter, 1 kg of quick lime, 1 kg of sulfur powder, and 15 kg of fresh water are mixed to make the whitening agent. The quick lime is first dissolved in clean water, then pulverized into sulfur powder, fully stirred and mixed, and turned into pale yellow paste. After applying the material, apply it on the trunks of litchi and longan, and apply it to a height of 1-1.5m from the near ground. Evenly coat all the trunks to kill the pathogenic bacteria that will overwinter on the trunk. The occurrence and damage of stem cancer in the second year. In the finished whitening agent, lime can not have particles, so as not to burn the litchi, longan trunk, affecting the normal growth of plants.
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