Codonopsis pilosula pest: grub
Belong to coleoptera, chafer family. It is a beetle larva, mainly active in the soil, harming the roots of Dangshen. White grubs generally produce one generation a year, and larvae or adults overwinter in the soil. When the temperature rises in spring of the following year, the grubs gradually move to the top of the soil. When the soil temperature reaches above 15℃, the grubs will feed on the top layer above 10cm. When the temperature rises and the soil is dry in summer, they will descend to the deep layer of the soil and do not eat. In autumn, they return to the topsoil and overwinter in the soil below 30cm after October. Rainy summer, soil moisture, manure application of more serious occurrence in the soil.
Control methods: apply decomposed organic fertilizer to prevent adults from laying eggs; kill artificially. When grubs harm in the field, the larvae near the rhizosphere of the injured plants can be dug out, and the roots of the plants can be watered with 1500 times phoxim solution.
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Prevention and control of diseases and insect pests of Pinellia ternata
(1) Root rot: this disease is easy to occur in high temperature season and stagnant water in the field. After the disease, the underground tuber rotted, and the shoot immediately fell to death. The prevention and treatment therapy mainly pays attention to drainage, pulling out the diseased plants and treating the diseased holes or watering the roots with 5% lime water, or soaking the seeds with 0.5% Mel 2% lime water for 12 hours for 30 hours. (2) virus disease: the specific manifestations are shrinking leaves and mosaics, which mostly occur in spring and summer. After the disease occurs, the diseased plants should be removed and burned and disinfected with lime. (3) Red diamondback moth:
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Codonopsis pilosula pest: red spider
It belongs to Araneae, Acarina, Tetranychidae. The adults and nymphs gather on the back of the leaves to suck the juice and draw silk to form a net, which harms the leaves and shoots, turns the leaves yellow and finally falls off; the flowers and fruits cause atrophy, dryness, rapid spread and serious harm, especially in the autumn drought. Control methods: clear the garden in winter, pick up the litter and burn it centrally, spray 1 °2 °B é (1 °2 Baume) stone sulfur mixture after clearing the garden, and spray 0.2 °0.3 °B é (0.2 °0.3 Baume) stone sulphur mixture in spring.
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