Aphid is a devastating pest that threatens the growth of leeks. It can endanger several times a year. It even causes plants that have been growing for years to wither and no longer germinate, and some plants are rotted due to excessive damage. First, the law of life, life history is divided into insects, eggs, larvae, cockroaches four stages. Adult emergence occurs from late April to early May. It enjoys a high temperature and low humidity environment, so it is most active in the dry spring. During normal daytime activities, lurking at night, in case of rain or wind, stop flying. Larvae often drill the cuticle of the root of the leeks, feed on the internal tissues, and feed on the leeks from the roots. The growth point of the leeks is endangered, and the plants wilted to death or rot. Second, control methods (a) low temperature drying method.éŸè›† Although it is safe to winter in the soil, soilless coverage will result in death if exposed to low-humidity air. Therefore, as long as the topsoil surrounding the loquat roots is excavated and exposed to an environment of -4°C low temperature and humidity of 60%, it can be killed after 2 to 3 hours. When the thawing begins in the spring, the topsoil surrounding the leeks root is removed with bamboo sticks, exposing the pupa to the surface, and when the larvae come into contact with low temperature and dry air, they will naturally die. The tick should be timely, rather than late rather than late, or if you start activities, axillary buds may be bitten. If the surface topsoil is not completely thawed during picking, it will be done in the afternoon on sunny days. (b) Use of pollution-free pesticides. 90% of trichlorfon can be used to control cockroaches 1000 times, with an acre dosage of 100 grams. In the spring and autumn, adults emerge in the flood season to root irrigation, and then cover soil. Can also be used 40% of Dilu EC, the amount of 50 to 100 grams per acre, diluted 1000 times after the root, usually in the occurrence of pests and diseases, but at least 10 days away from the harvest period.
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