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Latelar caterpillars larvae endanger the underground bulbs and pseudostem bases of leeks and, in addition to endangering leeks, also harm onions, garlic, lettuce, alfalfa and cruciferous vegetables. The newly hatched larvae endangered the base of the leek leaf sheath and the upper end of the bulb. In the spring and autumn, the young stems of the leek mainly caused rot, resulting in yellow leaves and dead plants. In summer, the larvae migrated downward into the bulb, causing the bulbs to rot and the whole plant to die.
The larvae of leeks were found in the open field of Dongtai area for 6 generations a year, and the generations overlapped severely. The larvae hibernated in the leeks bulbs or in the 3-4 cm layer around the roots of the leeks. There was no overwintering phenomenon in the greenhouses and the sustainable breeding hazards. The eggs are produced in the earth seams around the plants or under the clods, mostly in piles. The larvae begin to phlegm in early March and continue until the end of April; the larvae disperse after hatching. From mid-March to early May, the overwintering period of adulthood occurs, and the damage is serious from May to July. Adult insects prefer damp, damp and low light environments. The most active flying is at 9-11am. It is not conducive to the environment with high humidity, soil moisture, or excessive dryness.
The prevention and control of leeks in the eye shall adopt comprehensive measures. (1) Agricultural control. The selection of insect-free Chinese cabbage seedlings transplanting, the early spring before the emergence of Chinese chive seedlings dip the root surface of the top soil, and can be sunburned to kill some of the larvae. When the larvae occur in early spring or autumn, they are continuously watered for 3 days, once each morning and evening, submerging the ridge back, which can reduce the damage. (2) Chemical control. Before transplanting, the roots of leeks were soaked with 48% chlorpyrifos EC 1500 times to eliminate the insect source. During larval stage, when the leek leaves begin to become yellow and soft, use 48% chlorpyrifos EC 150-200 ml water 500-1000 kg per acre to irrigate the root; adult emergence period, use 20% fenvalerate EC 3000 times at 9 am - Spray at 10 o'clock, once every 10 days, continuously control 3 to 4 times to eliminate adult eclosion.
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Late larvae of leeks are commonly known as crickets. They are important pests that endanger leeks. In recent years, serious leeks in large and medium sheds have occurred. Light plants cause lodging of yellow leaves of leeks, severe defoliation of leeks, and even destruction of crops.