In July and August, even with continuous rain, the temperature is significantly lower than in previous years. It has a greater impact on the normal growth of citrus fruits that are in fruit expansion, and some fruit orchards have serious fruit drop, fruit cracking, and pest and disease infestation. Effective technical measures must be taken quickly to prevent And reduce the loss of low temperature continuous rain disaster.
Trenching drainage of citrus is not tolerable, even if the soil caused by cloudy rain for a long time, will cause root growth points to supply oxygen, respiratory effects weakened, severe root growth point necrosis, resulting in malabsorption and ethylene production, resulting in fruit drop, Fruit cracking and anthracnose damage. Therefore, it is necessary to keep the orchard well drained, keep the soil dry and air circulation, and ensure the normal growth of citrus roots and the absorption of soil minerals.
The increase of trace elements has confirmed that even continuous rain will lead to the loss and absorption of trace elements. In particular, root water uptake will lead to reduced absorption of copper and zinc and increase of nutrient deficiency, leading to severe fruit drop, fruit cracking and anthrax, and brown spot disease damage. Increase. Therefore, as an emergency prevention and control measure, a large area of ​​orchard zinc supplementation operations should be conducted, and one or two 0.2% zinc sulfate sprays should be applied. The fruit orchards that are cracked, withered and flowed in the heavier orchard area should be sprayed with 0.08% copper sulfate. control.
The prevention of pests and diseases from August to October will lead to increased humidity, reduced accumulation of tree nutrients, and reduced ability to resist pests and diseases. Currently, leafminers, spider mites, snails, rust ticks, anthracnose, and soy disease have occurred. All districts and counties shall further strengthen technical training and guidance, adopt bio-physical prevention and control measures such as solar-powered insecticidal lamps, sticky-worm swatches, prey-cockroaches, trap-kill cans, and trunk adhesive tapes, combined with the necessary prevention and control of low-toxicity and high-efficiency pesticides. The Orchard and the Base shall be required to make emergency preparations concerning relevant agricultural resources, machine tools, and personnel arrangements. Once outbreaks of pests and diseases are discovered, the orchards shall be organized in a timely manner to form professional teams to deal with them.
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