A: Before and after the coloring period of jujube fruit, there appear black spots on the fruit surface, which is generally brown spot disease. Generally, when the jujube fruit is to be colored in August and September, it will be a large number of diseases. The key to prevention and control of brown spot disease is to strengthen cultivation and management. Do a good job in orchard health, remove bare land in a timely manner, and prune off dead branches, diseases and insects, and burn them together. Increase organic fertilizers, increase tree vigor, and increase tree disease resistance. Pharmacy prevention, after flowering began to control. Spraying is usually started about half a month after flowering. Effective drugs include 30% carbendazim suspension 1000-1200 times, 70% thiophanate-methyl WP 1000-1200 times, and 1:2-3: 200 to 240 times more Bordeaux mixture. Note that in the prevention and treatment process, drugs should be used alternately. Do not use only one agent. At the same time, protective agents and therapeutic agents should also be used alternately to improve the control effect.
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