Citrus black spot disease control was

Citrus black spot disease, formerly known as resinous disease or scar disease. In recent years, the disease has become the main disease of citrus in the Chaoshan region. It is the main fruit of the disease. From the end of April to May, it is an important period for the prevention and treatment of the disease. Citrus farmers should strengthen prevention and treatment.

Strengthen cultivation and management, increase organic fertilizer, bio-organic fertilizer, appropriate application of phosphorus, potassium and calcium fertilizers to control nitrogen fertilizer; reasonably trim and thin fruit, coordinate vegetative growth and results, maintain stable tree vigor; prevent and treat branches, pests and diseases , Reduce pest wounds and mechanical wounds; soil heavy orchards, pay attention to drainage during the rainy season, and improve the soil, lime and shell ash when the soil is wet after the spring rain, 100 to 200 kg per mu.

Clear the field bacteria source in the dormant period of fruit trees for disinfection by clearing the garden, scrape the hard plastic lump and decayed cortex and wood in the lower part, cut off the dead branches in the garden, and gather them to burn out in the garden; before the fruit trees germinate, spray the lime sulfur mixture and eradicate. Overwintering pathogens; winter and summer main trunk whitening to prevent gummy disease; whitening agent with lime 10 kg, sulfur powder 1 kg, 0.2 kg of salt, add water 30 kg Stir, tune into a paste, you can use for whitening.

Chemical control spray 300 times before flowering love Aidi Kang 108, combined with boric acid, magnesium sulfate or potassium nitrate 802; from the end of April to May is an important period of pharmaceutical black spot prevention and control, use 80% of dexamethasone zinc (or Dasheng, Shan Desheng, Pike, etc.) 800 times liquid, can be combined with the control of black spot, oil spot, coal smoke and pests, etc., at intervals of 10 to 15 days 2 times; young fruit in the event of heavy rain, strong winds, use 30 % Ai Miao EC 3,000 ~ 4000 times liquid spray prevention and treatment is better; 6 to 10 months after the rain turned sunny, to immediately spray black spot disease prevention, optional Dasheng M-45 plus agricultural streptomycin and ulcer disease control; August In mid-late and mid-September, Dasheng M-45 or 80% dexamethasone zinc can be used to prevent black spot disease and prevent rust and soot. When the fruit starts to turn color, it can be used to prevent or treat 1-2 times of lime sulfur yellow mixture. Black spot disease.

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