What are the common diseases and insect pests of onions and garlic? How to prevent and cure it? What are the technologies?

Onion and garlic vegetables are a kind of vegetables with special smell. It is rich in sugar, vitamin c, sulfur, phosphorus, iron and other minerals, and contains bactericidal substances (propylene sulfide), which can promote appetite, seasoning, deodorization and medical treatment. What are the diseases and insect pests of onions and garlic? How to prevent and cure it? What are the technologies?

What are the diseases and insect pests of onion and garlic?

At present, diseases and insect pests such as leaf blight, purple spot, white rot, downy mildew, thrips, aphids and Lepidoptera pests mainly occur in onion and garlic. In order to ensure the high quality, high yield and high efficiency of garlic and chives, we should adhere to the plant protection policy of "prevention first and integrated control", implement the new concept of "public plant protection and green plant protection", implement health care cultivation on the basis of agricultural control, and demonstrate and popularize green prevention and control techniques. Chemical control was carried out scientifically according to the occurrence law of diseases and insect pests of onion and garlic.

How to control diseases and insect pests of onion and garlic? What are the technologies?

1. Agricultural prevention and control

Agricultural technical measures such as clean countryside, scientific fertilization and irrigation, and strengthening ploughing management should be taken to create ecological environment conditions conducive to the growth of garlic and chives, but not conducive to the occurrence of diseases and insect pests, enhance plant resistance and reduce diseases and insect pests.

2. Technical prevention and control of "three inducements"

(1) Insecticidal lamp attracts insects. Insecticidal lamps were used to lure and kill adults of Lepidoptera pests, and one insecticidal was placed every 30-50 mu.

(2) seducing insects by color plate. Yellow viscose board and blue viscose board were used to trap thrips and aphids. 20-30 (20 × 24) armyworm boards were hung per mu.

(3) sexual attractants to attract insects. Sexual attractants were used to trap and kill Lepidoptera pests such as Spodoptera litura and Spodoptera exigua with 2 sets of sex attractants per mu.

3. Chemical control

Use pesticides scientifically and rationally, prescribe the right medicine to the case, use pesticides alternately, strictly enforce the pesticide safety interval, prohibit the use of high toxic and high residue pesticides, and adopt new application instruments to improve the atomization effect of the liquid, in order to reduce the amount of pesticides, improve the effectiveness of pesticides, and improve the effect of prevention and control.

(1) garlic, onion leaf blight and purple spot. In the early growth stage of garlic and chives, that is, before the seedling stage and flower bud differentiation stage, and before the tillering stage, garlic was sprayed with 70% mancozeb WP500~600 solution or 75% chlorothalonil WP500~600 solution, once every 10 days, for 2-3 consecutive times. At the initial stage of the disease, 10% difenoconazole WG4000~5000 times solution or 75% chlorothalonil WP500~600 times solution or 25% propiconazole EC2500~3000 times solution were selected for spray control, once every 7-10 days, for 3-4 consecutive times.

(2) garlic white rot. At the initial stage of the disease, 70% methyl thiophanate WP500~600 times solution or 50% isobarbazide WP1000~1500 times solution and other agents can be used to spray leaves and irrigation roots, once every 7-10 days, continuous prevention and treatment for 2-3 times.

(3) treatment of downy mildew of chives. At the initial stage of the disease, 77% copper hydroxide WP1000~1500 times solution or 50% enoylmorpholine water dispersible granules 1000 times or 50% metalaxyl manganese zinc wettable powder 500 times or 72.2% aldicarb hydrochloride 1500 times 2000 times or 94% urea cyanide 1500 times solution were selected for spray control, once every 7-10 days for 3-4 times in a row.

(4) thrips and aphids. Choose 70% imidacloprid water dispersible granule 3000 times or 5% imidacloprid microemulsion 2000 times 3000 times, 25% thiazine wettable powder 4000 times solution or 50% imidacloprid water dispersible granules 4000 times for spray control, once every 7 days, continuous control 2-3 times.

(5) Lepidoptera pests. When the larvae are at 1-2 instar, choose 50% fluflubenzuron EC 1000-1500 times or 10% cypermethrin EC 2000 times 2500 times or 5% methamectin benzoate salt water dispersible granules 3000-4000 times for spray control, once every 7 days, 2-3 times continuously.