How to prevent the pests and diseases from planting Radix

How to prevent the pests and diseases from planting Radix.
At the time of seedlings: seedling height 5-7 cm time seedlings, seedling height 10-15 cm when the seedlings, seedlings and seedlings should go weak and stay strong, timely replenishment, this stage to keep the soil moist. Cultivate weeding. After the seedlings, it is necessary to timely weed and weed one time, and then once every half month or so, after the plants are closed, no more cultivating and weeding. top dressing. From May to July, 500-1000 kg of manure and urine, or 10 kg of urea per acre of ditch, and 10 kg of superphosphate will be added, and watered after application. Apply 5-7 kg of ammonium sulfate per acre after each leaf picking (do not use ammonium bicarbonate). Watering and draining. Water should be watered in time when the weather is dry in summer, and dredging should be paid during the rainy season to prevent rotten roots. Breeding method. Propagation with seeds, Banlangen did not seed in the year. In the second half of October, when selecting the blue roots, the roots with no pests and diseases, large and strong roots and inseparable roots should be selected. The plants should be transplanted to fertile seedlings at a planting distance of 50 cm × 30 cm. Watering should be timely after planting to strengthen field management. When the seeds mature from May to June, the seeds are harvested, dried and threshed in stages, stored in a ventilated and dry place, and the roots of the Radix Paeoniae roots are collected and can no longer be used as medicine.
Diseases: mainly downy mildew and root rot. The leaves of downy mildew are light green lesions. White or gray-white mildew is produced on the back of the leaves. In severe cases, the leaves die; root rot mostly occurs in the rainy season, causing the roots to rot, leading to death of the whole plant. Control methods: mainly based on agricultural control, with reasonable rotation of grasses and legumes, reasonable close planting, improve ventilation and light transmission conditions, and find that diseased leaf plants are removed in time to be taken out of the field, concentrated deep buried; 65% can also be used Zinc or 77% can kill wettable powder spray or rooting.
Pests: mainly cabbage caterpillars and diamondback moths. The cabbage caterpillar bites the leaves, causing the leaves to be holed and nicked. In severe cases, only the veins are left behind; the diamondback moth bites the leaves, causing the "skylight" at the beginning, causing nicks and holes in the later stage, leaving only the reticular veins. Controlled with Diflubenzuron No. 3, BT emulsion, and 90% trichlorfon 1000 times spray.

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