The leafminer has developed serious resistance to abamectin, and the current drug is cyromazine. The patented product FEROLITE launched by RUSSELL IPM in the UK has a very good control effect on spotted leafminers. It has been well used in many European and Mediterranean countries and is the first choice for green prevention and control.
The insect occurs for 21 to 24 generations in the southern provinces every year, and there is no overwintering phenomenon. The adult insect stabs the leaves with its ovipositor and sucks the juice. The female lays eggs under the epidermis of part of the wound;
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The eggs hatch in 2 to 5 days, and the larval stage lasts in 4 to 7 days. The last instar larvae bite through the leaf epidermis and pupate outside the leaves or under the soil surface. The pupae emerge into adults in 7 to 14 days. Each generation takes place in summer. 2 to 4 weeks, 6 to 8 weeks in winter.
Extended information:
The pH value of the soil for green onion planting is suitable for 6.5 to 7.5. The moisture in the soil can be controlled about 10 to 15 days before planting to prevent lodging. Fertilizing green onions requires a balanced application of phosphorus, potassium, and nitrogen fertilizers. In the early stages of growth, the demand for nitrogen fertilizers is mainly high, and in the later stages of growth, the demand for phosphorus and potassium fertilizers is greater. Green onions have good stress resistance and are both cold and heat tolerant. The root system of green onions is more afraid of waterlogging, and high temperatures and high humidity can easily cause death. Before planting green onions, separate the large and small seedlings first, and then remove the sick and weak seedlings. When planting, you can arrange the green onion leaves vertically to the cultivated plot for dense planting and easier management.
Reference: Baidu Encyclopedia---Lemonia spp.