Prevention and control of diseases and insect pests of Angelica sinensis
(1) The peak period of the disease occurred in the middle of April, June, September and November after transplanting. Control methods:
(1) 3kg of 3911 granules and 15kg of fine soil are mixed evenly or 0.5kg of 20% iso-methyl phosphorus emulsion is added with 2.5kg of water and sprayed on 15kg of soil, mixed evenly, scattered and turned into soil;
(2) Irrigate the roots regularly with broad-spectrum long-acting pesticides, 250g 40% carbendazim or 600g thiophane and 150kg water per mu, 50g diluent for each plant, once in early May and mid-June respectively.
(2) Sclerotinia sclerotiorum damage leaves, easy to occur under low temperature and high humidity conditions, July and August damage is more serious. Control method: no continuous cropping, in the first half month every 10 days or so, 3-4 consecutive times with 1000 times 50% methyl tolcitrin spray.
(3) The pests were mainly caused by adults of golden needle and cutworm. Control methods: uproot grass inside and outside the field, pile into small piles, 7-10 days for fresh grass, trapped with poison bait.
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Prevention and Control of Diseases and insect pests of Angelica sinensis
Root rot: soak the seedlings in Bordeaux solution, disinfect the soil and kill insects, and burn more smoked soil in the nursery. Brown spot: pay attention to field hygiene, remove the diseased leaves in time, and spray 150 times Bordeaux solution with 1 Bordeaux solution in the middle and later stages. Insect pests: there are mainly peach powder aphids, commonly known as "beetles". In May, a large number of propagation, concentrated in the new shoots of Angelica sinensis and the back of the young leaves to absorb juice, so that the heart leaves thicker, fist-shaped curling, plant dwarfing. Control methods: remove weeds around the field and reduce the chance of aphids moving in; aphids
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Pest control of licorice
(1) leafhopper: there are mainly elm leafhopper, small green leafhopper and so on. It occurs in the whole growing period of licorice, and the damage is the most serious from late June to mid-August. When nymphs or adults suck the leaves, buds, young branches and buds of licorice, they first show silver spots, then the leaves lose green and show light yellow, and finally fall off. Control method: remove the elm and other leafhopper overwintering hosts around the licorice field. The peak of the damage was prevented by spraying 2.5% deltamethrin 1000Mel 1500 times. Use grass aphids, ladybugs, etc.
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