Root lice are the most recent pests, mainly onion fly and late-wing gnat mosquitoes.
First, the harm symptoms: roots drilled into the bulbs foraging, a dozen often dozens, dozens of larvae, the victim's bulb was eaten into a hollow, causing decay leaves yellow, withered to death.
Second, control methods:
1, sun root.
2. Apply turfgrass or 5% phoxim granules per acre to 2 kg of fine soil and sprinkle it near the root of leeks.
3, larvae damage period, found that the tip of the leaf began to yellow and soft to the ground lodging, can be controlled by irrigation, available 75% phoxim EC 500 times or 25% quinoline EC 1000 times, breaking the rhizosphere topsoil, For the root sprinkling irrigation, cover the soil at any time, and spray the best at 9-10 AM.
4, in the adult emergence period (in late April, mid-June, late July, mid-October) spray 10% of the net (also known as a net, Kang Fu, imidacloprid, Dagong Chen, etc.) 2000-2500 Times of liquid, or 75% of phoxim 1000 times or 2.5% of cyanuric chloride vinegar 3000 times, 9-10 am spray effect.
5. The larvae of summer-spotted larvae prefer to shade, damp and humus. In summer and autumn, the ventilation of the leaves can be reduced, and the lighting tends to be inclined. It can also be trapped and killed by frequency-vibration insecticidal lamps.
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