Second, the prevention and treatment methods Before the spring amaranth sprout, from the top soil of the loquat to turn over the sun, and sun root, after 5 to 6 days the larvae can be sunburned. Cover the soil before planting furrows, or use 5% phoxim granules per acre 2 kg, mixed with fine soil and then cover the earth near the roots. When planting leek, pay attention to the selection of bulbless or dip 50% of phoxim EC 1000 ~ 1500 times liquid to kill the larvae. Chemical control: During the adult emergence period, 2.5% of trichlorfon powder is applied in Shun ridge, 2 to 2.6 kg per acre, or 50% of phoxim EC at 1000 to 9 to 11 am. Or 48% of Lorenzine EC 1500 times, or 2.5% deltamethrin EC 2000x. During the larvae's endangered period (mid-late and late-September and late-September-September), it was found that the tips of the leaves became yellow and soft and gradually lodging, that is, they should be controlled by spraying, and 48% of Le Siben EC and 90% of the crystal trichlorfon could be used. , 0.3% matrine 1000 to 1500 times the liquid, open the top soil near the pier, remove the nozzle of the sprayer, sprinkle irrigation on the root, and then cover the soil. It can also be combined with soil, fertilization using the above-mentioned agent Irrigation.
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Harm and Prevention of Earthworms
First, the occurrence of the law and the characteristics of harmful larvae larvae gathered in the underground hazards, drilling stems and bulbs of leeks. After the damage, the leaves of the leek were thin, withered, wilted, broken and rotted, and the entire pier fell into pieces. The pupa usually occurs four to six generations per year in open field fields, and the generations overlap. The larvae hibernate in the soil or bulb within 3 to 4 centimeters around the root of axilla, and the larvae begin to feed when the amaranth sprouts in spring. From late March to mid-May, they become adults and copulate. From April to June, they enter the endangered period of attack, and a variety of insects coexist in the field. Summer due to high temperatures, plant aging and heavy rain erosion damage. From late September to mid-October, the danger was again severe. In November the larvae survived winter or moved to the greenhouse to continue the damage. Many eggs are spawned, a small number of scattered production, mainly produced in the gap between the stem and the soil of leeks, leaf sheath gaps and soil blocks, each female lays an average of 100 eggs. The newly hatched larvae endanger the young part of the leek and rotten leaves near the ground. The larvae secrete knots and sparse wire meshes, adhere to host debris, feces and soil particles, etc., and feed under the colony nets, reaching host pith with host rot. Mature larvae are often used to make larvae in shallow soil. The larvae are afraid of being wet and the sandy loam is good for damaging the earthworms. In spring and autumn, the adult period is generally 3 to 6.5 days, the egg period is 4.5 to 8.5 days, the larval period is 15 to 18 days, and the flood period is 3 to 7 days.