The common insect pests of onion, garlic and leek vegetables are mainly seed flies, shallot thrips, shallot leaf fly, leek jumping blind bugs and leek root maggots.
Onion land to plant flies
Onion flies are mainly harmful to garlic, onions and onions, and sometimes to leeks. Seeds and young stem roots are sown with larvae as a pest, so that the seeds cannot germinate and the seedlings die. The onion field is planted with fly moths to eat the underground garlic cloves after planting, which will cause the garlic cloves to crack and the upper part of the ground to turn yellow, and the heavy will cause the whole plant to die.
Control methods for planting flies in allium fields
1, agricultural control: the application of organic fertilizer should be fully decomposed, fertilization should be uniform, deep and isolated from the seed, immediately after application. Select seedlings and sow the soil at the right time. The moisture is moderately wet and dry, and after maggot infestation, it can be flooded with large water, once every other day, for 2 consecutive times.
2, pharmaceutical control: sowing ditch poison soil (25 grams per acre of enemy insects, fine soil 15 kg) to kill larvae, adult insects can be used 90% enemy insects or 50% dichlorvos emulsion 1000 times liquid spray, or 50% octylthion emulsion 1000 times liquid, every 6-8 days spray again.
Onion thrips
Onion thrips are mainly harmful to green onions, garlic, onions, leeks, melons, solanum fruits and vegetables, adult worms and nymphs to dampen the epidermis of host heart leaves, young stems, young shoots and other tissues, aspirate sap. Long strips of white spots appear in the affected area, and in severe cases, the onion leaves twist and yellow, shrink and sag, and spread a variety of crop virus diseases. It occurs severely under dry, rainy, warm environmental conditions.
Control methods of shallot thrips:
1. Agricultural control: remove the fallen leaves of the remaining plants and burn them outside the field, turn the land deep in time, and reduce the source of insects. Water frequently, prevent drought, and increase the application of phosphorus and potassium fertilizers.
2. Physical control: using the blue habit of thrips, a blue plate coated with organic oil is set in the field to trap. 3. Pharmaceutical prevention and control: 20% good winter emulsion 2000-2500 times liquid can be sprayed alternately, or 2.5% enemy killing emulsion, or 20% Juma emulsion 1000-1500 times liquid, or 2.5% kung fu emulsion 3000-5000 times liquid, or Aktai 1000-15000 times liquid. Spray again every 6-8 days.
Onion leafminer moth
Leafminer flies use larvae to feed on leaf flesh in leaf tissue, forming a circuitous and zigzag worm path, leaving only the upper epidermis at the site of the victim, which can cause the whole leaf to wither and the yield to decrease in severe cases.
Control methods of allium leafminer moth
1. Agricultural control: remove weeds inside and outside the field in early spring, treat residual plants, and reduce insect sources. Implement formula fertilization and do a good job in fertilizer and water management.
2. Booby traps adults: use sweet and sour solution to trap adult insects.
3, pharmaceutical control: can be used 98% Bataan soluble powder 2000 times liquid, or 20% imidacloprid solvent 2000 times liquid, or 20% good winter emulsion 1000 times liquid, or 10% bromo horse emulsion, Juma emulsion 1500-2000 times liquid, or 40% Seven Star Treasure Emulsion 600-800 times liquid, pay attention to the umbilical alternating spraying.
Leek jumping blind bugs
The leek jumping bug sucks leeks with adult and nymphs, producing white to light brown spots, and in severe cases, the leaves of the whole plant turn yellow and wilt.
Prevention and control method of leek jumping blind bug
1. Agricultural control: winter ploughing and cleaning of the countryside, removal of fallen leaves and dry grass on the edge of the field; timely watering, can kill some adult insects and first-generation eggs.
2, pharmaceutical control: mainly adult insects, control of nymphs should be before dispersion. It can be sprayed with 80% dichlorvos emulsion 1500-2000 times liquid, or 2.5% cypermethrin 3000 times liquid, or 50% octanoic emulsion 3000-4000 times liquid spray, sprayed once every 6-8 days, 2-3 times continuously.
Leek root maggots
Chives are also known as leek maggots, which are mainly harmful to leeks, green onions and garlic. Leeks suffer the most. The larvae colonize the leeks underground bulbs and tender stems to moth, causing the bulbs to rot and the leek leaves to wither and die. At worst, it will cause the lack of plants and ridges, and the heavy will destroy the seeds. The larvae prefer to be wet and afraid of drying, and the wet soil, succulent young stems and bulbs are seriously affected.
Control methods of leek root maggots
1. Agricultural control: winter irrigation or spring irrigation vegetable field can eliminate some larvae, such as medicinal liquid (ammonia 8-10 kg/mu). After 5-6 days of drying soil and roots, sprinkle 50% malathion powder or 1.5% Leguo powder (2 kg/mu) before covering the soil or spray fine soil with emulsion to make poisonous soil.
2. Pharmaceutical control: In the peak period of adult feathering, use 10% Kikuma emulsion 3000 times liquid. Or 2.5% cypermethrin 3000 times liquid, or 20% cypermethrin 3000 times liquid, or 50% octylthion emulsion 1000 times liquid spray, preferably sprayed at 9-10 a.m. When the leaf tip is found to turn yellow and soft and gradually collapse to the ground, the root control is carried out with 20% chlorma emulsion 2000 times wave, or 2.5% enemy killing emulsion 5000 times liquid, or 50% octyl thiophosphorus emulsion 2000-3000 times liquid.