The current citrus production situation is very grim, the main performance: 1 the second physiological fruit drop severity, time, the average fruit drop rate of 3-10%, after the fall of heavy orange fruit garden more serious fruit drop; 2 genus harmful heavy: red spider The average amount of insects was 676 heads per louvre, and the amount of lobular insects in the extensive park was 1,500 or more. The prominent phenomenon was that yellow spiders were more common and lasted for a long time. In the orchards and shade gardens of the mountains, there are a large number of insects, and the yellowing leaves of the spring tip are severely damaged. 3 The number of aphid mites is large. According to the survey, the adult day of the black locust mites was found on June 3, and the second generation of the tangerine meal was in the second generation. Under high temperature conditions, it is able to grasp female reproduction, and currently shows the peak of adulthood; 4 The current population of rust ticks grows rapidly, reaching 0.5 head/fruit. In order to ensure citrus production and quality this year, the following measures are recommended:
1. If there is a small amount of fruit, this year, the deciduous garden in Guiyang will have fruit once before June 28th. With spring rain on the 1st to increase the rich potassium garden spray, and erase the sporadic strong Wang Xia shoot.
2. Early fruit growth promoting fruit fertilizer: fruits with a fruiting weight of 50 kg/plant or more, and each fruit planting strength: The high nitrogen, potassium, low phosphorus compound fertilizer 2-3 kg + cake fertilizer 1 - 1. 5 pounds. Japanese settlers' compound fertilizers are both quick-acting and persistent, and are suitable for the later growth characteristics of citrus. Note that the fertilization surface is large and uniform. It is strictly forbidden to concentrate. The time is completed by June 28.
3, timely summer cut: early maturing varieties should be carried out around June 25, mid-late maturing varieties can choose to start at the end of June to early July, the main task is to "window piling", forced good neat early autumn shoots, to ensure the output of next year .
4. Prevention and control of fleas: According to the field test, the formulation with green lycra 200 times+1.8% avermectin 4,000 times is safe and effective, and the time is completed on June 25th-28th. . In mid-July, it is recommended to spray twice for too long.
5. Prevention and control of whiteflies: As the second generation of insects is very neat, control agents should be based on good sustained effects. For example, Ulead, Aketai combined with fleas and control, using the function of green ying to synergize and kill eggs, to achieve the purpose of controlling whiteflies. (Hubei Dangyang Agricultural 110 Service Center)
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