Liriomyza is also known as a ghost-painting character and belongs to the insect pest of the family Diptera, Liriomyza. Adult larvae can be harmful. The female adults stabbed the plant's leaves for feeding and spawning. The larvae invaded the leaves and petioles, resulting in irregular snake-like white insects. The chlorophyll was destroyed, affecting photosynthesis, and the leaves of the injured plants fell off, causing flower buds and fruit to be burned. Seriously caused destruction of seedlings.
Liriomyza sativae mainly harms cowpeas, broad beans, soybeans, beans, tomatoes, eggplants, peppers, cucumbers, melons, watermelons, wax gourds, sponge gourds, zucchini, celery, ramie, Chinese cabbage, cotton, rape, and tobacco. Pleasure beans, melons, tomatoes, lettuce, is a high food pest. At present, L. sativae has begun to harm many kinds of vegetables and it is necessary to step up prevention and treatment.
First, the hazard characteristics Liriomyza sativae adults and larvae can harm vegetables. The female adult punctures the leaves of the plant and feeds and spawns; the larvae infiltrate the leaves and produce irregular serpentine white worms in the mesophyll between the epidermis and the lower epidermis. The chlorophyll in the leaves is destroyed, affecting photosynthesis. As a result, the growth of the vegetables is slow and the growth is poor. The larvae in the leaves are often connected. The white worms are linked together. The entire leaves are white and the leaves fall off. The leaves rot when the air humidity is high, causing serious damage to the seedlings.
Second, the occurrence of characteristics Litoria vulgaris is short-generation, strong reproductive ability, each generation 2-4 weeks in summer, 6-8 weeks in winter. The factors affecting the occurrence of L. sativae are temperature and rainfall. Generally, it can develop at 12-35°C, but it is slow to develop below 20°C, and low temperature is also harmful to pupation. Above 30°C is not conducive to the development of population. Rain, especially after heavy rains, can kill some of the adults and slugs. The eggs are usually hatched within 2-5 days, and the larval period is 4-7 days. The last-instar larvae bite and break the leaf epidermis outside the leaf or under the surface of the soil, and the pupae become adults after 7-14 days of emergence.
Third, prevention and control methods Liriomyza sativae adult is relatively small, often not be found, larvae and harm in the leaves, poor drug control effect, and rapid development of drug resistance, to control a great difficulty, therefore, should be implemented to prevent Mainly, comprehensive prevention and control.
1. Reasonable crop rotation, removal of miscellaneous items: Implementation of melons, beans, etc. Liriomyza lucidum eat vegetables and onion, garlic and other non-like eating vegetables such as a reasonable rotation. Before the planting of vegetables in early spring and autumn, weeds, stubbles and leaves were completely removed inside and outside the vegetable fields and burned.
2. Irrigated flooded soil: According to the characteristics of the matured larvae of vegetable leaves, the mature larvae climb out of the foliage or fall into the soil. Before or during the sowing, water can be used to flood the soil or turn the soil frequently to eliminate some insects.
3. Seedlings transplanting: In the early stage of insect pests and when transplanting seedlings and transplanting, the insect leaves are removed and the leaf larvae are killed, which can better control the growth of the insects.
4. Yellow plate trapping: According to the yellowish habit of Liriomyza, the yellow plate was used to kill the adult of Liriomyza sativae. In vegetable gardens, greenhouses, greenhouses and other facilities, hang waste fibreboard or cardboard (1m 0.2m) coated with yellow paint on both sides. Apply a layer of viscous oil every 5-7 days (add a little bit of oil and mix with 10th motor oil) , several times in a row. 25-30 pieces per mu, placed between rows, can be slightly higher than the plant height.
5. Scientific medication. Before the second instar of the larvae of the vegetable leafminer (when the worm tract is very thin), the medicine is used for prevention and treatment. Choose pesticides that are highly effective, safe, and resistant to chemical resistance. Chemically available: 1.8% avermectin EC 3000 times, 5% SCALCO 2000 times, 50% CITS water soluble 2500-3500. Times of liquid, 52.25% of farmland emulsifiable concentrate 1000 times, 10% of imidacloprid wettable powder 1000 times, 25% of spot neutralizing cream 1500 times of liquid, 25% of thiamethoxam water dispersed granule of 3000 times, 48% of chlorpyrifos 1500 Double spray control. Prevention and control time is good at 8-12 when the adult emergence peaks. Application interval is 4-6 days. The above medicines can be used interchangeably to avoid drug resistance. Pay attention to 10-15 days before picking the vegetables and avoid using drugs to ensure the safety of the market.
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