Prevention and control of pests and diseases should adopt scientific prevention and control measures, vigorously promote pollution-free prevention and control technologies, and disable high-toxicity and high-residue pesticides so as to effectively control pests and diseases, and to ensure that product pesticide residues do not exceed the standard. In prevention and control, we must take "prevention-based, comprehensive prevention and control" measures and timely preventive measures. (I) Agricultural control: Before harvesting asparagus, the old stems should be removed from the sunny days before the beginning of harvest in the “Lichun†and “Liuqiu†seasons, and a thorough clearing should be carried out to eliminate the pests and diseases that lurk in litter and soil. Qingyuan will cut old stems and newly emerged stems that have become deformed, diseased and wounded, and move away from the fields to burn them up. At the same time, herbicides shall be used to remove weeds from the fields and open the sand of the asparagus broom to remove residual stems. After exposure to sunlight for 1-2 days, use 70% thiophanate-methyl and 50% carbendazim 0.5Kg per 667m2, 1kg of phoxim 1Kg, add water 500-600Kg, and then cover 5-6cm sand. Eradicate pests and diseases; strengthen fertilizer and water management, increase organic manure, and pay attention to the reasonable mix of nitrogen, phosphorus, potassium and trace elements. If the soil of bamboo shoots is acidic, appropriate amount of lime powder can be applied to regulate the pH of the soil; pay attention to drought prevention and drainage. Promotes robust plant growth, enhances resistance to disease, and can't harvest excessively to prevent premature aging. (II) Chemical control: The prevention and control of drugs must be mastered for the critical period of prevention and control. For diseases such as stem blight, we should seize the initial stage of disease prevention and control to protect the susceptible period from the germination of the mother stem to maturity: to catch larvae on pests. Incubation from the peak to the young age. After clearing the garden, young shoots began to be sprayed to prevent stem blight when they were just growing out. Pharmacy should be frequently used for rotation, and do not use a single agent for a long time, so as to avoid drug resistance and affect the efficacy. 1, the growth period of the mother stem: appropriate use of high efficiency and low toxicity and low residual pesticide such as Dasheng M-45 WP or 65% WP or 70% thiophanate-methyl WP or 50% carbendazim WP 500-600 times of liquid, or 80% of new Wansheng WP 300 times, or 65% of Daisen ammonium water 800-1000 times to control stem blight and brown spot; control pests in larvae 1-2 For spraying, use 5% Sodium Chloride 1000-1500 times, or 90% Trichlorfon 600-800 times, or 10% Cypermethrin 1000 times plus a small amount of Dimethoate, or 2.5% deltamethrin EC 600 -800 times liquid mixture trichlorfon or amodicarb 3000 times liquid nocturnal moth family pests: with 10% Dagong Chen 1000 times liquid or 10% imidacloprid wettable powder 1500-2000 times liquid to control aphids and thrips; occurrence of mites and red The spiders can be sprayed with 1000 times of Schizothrin emulsion. 2. Harvesting period: Biological control should be promoted, and 12% of BiLiKang 1000 times liquid or 3% KeXiYang 800-1000 times liquid and other biological preparations can be used for the prevention and treatment of stem blight; Caishuxingxing 600-800 times liquid, or Beauveria bassiana or Bacillus thuringiensis 1000 times, or 1500 times the total liquid prevention and treatment of Spodoptera and other moth pests; using avermectin biological pesticides to control aphids and thrips. For soil insects such as ground tigers and adults of the noctuid family, sugary vinegar (3 parts sugar, 3 parts vinegar, 1 part wine, and 10 parts water plus 0.1% trichlorfon) can be placed in the field to trap and kill adults.
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