Due to the low temperature in winter and spring, the occurrence period of Bactrocera dorsalis in the field was later than last year. According to the field pest monitoring, it was observed on April 25 and was postponed by 40 days from last year. On May 25th, the number of field traps was 8-13, an average of 10 heads, which was 15-38 heads of the same period of last year, with an average of 25 heads, a decrease of 15 heads. Although this year's insects have been postponed, the amount of occurrence has been small, but last year there was a large area with a heavy degree of damage. The amount of residual insects in the fields was large, and the insects had a short period of occurrence and strong reproductive ability. Therefore, the fruit farmers in various places must not be paralyzed, and they should promptly kill and prevent and control the disease in Li, Gua, and Liyuan, and lower the number of previous insect populations.
Prevention and control measures should be taken to prevent and kill adult worms and control them before they are pressed. The implementation of the comprehensive prevention and control measures for agricultural control, attracting and killing adult worms, spraying crowns and grounds.
I. Agricultural control
1. Deeply turn the soil. In winter and spring, the garden is completely cleared, plowing is performed once, or the soil is plowed during the period of generations. The practice is: in the winter over the winter or before the emergence of adult worms of various generations, in combination with the winter clearing garden, deep-turning soil 15-20 cm, so that it can not be feathered unearthed. For heavily damaged orchards, deep pour soil, with 50% phoxim EC 1000 times, 45% Malathion EC 1000 times, or 48% chlorpyrifos 800 times evenly spray the ground, focusing on the crown In the following table, the soil was sprayed once a week, spraying 2-3 times successively to kill old mature larvae and pupae at different developmental stages, and to reduce the population or density of field insects.
2, remove the insect fruit. Regularly clean up the fruit drop and the fruit on the tree. In the initial stage of fruit drop, clear the fruit and fruit on the ground once a week. The falling fruit will last once a day until the end of the fruit drop, so that no dead corners will be left and buried in the pit more than 50 cm deep. Covering with soil, it can also be poured into long-term immersion treatment tanks. Or use 50% ciprofloxacin 7500 times for 2-3 days soaking.
3, pruning branches. Removal of dense plants, widening spacing and spacing, cutting off dense crowns, appropriate distance between the middle and upper branches, improve ventilation and light conditions in orchards, deterioration of the breeding environment of Bactrocera dorsalis.
Second, physical control
1, bagging. It is one of the most effective ways to control the oviposition risk of female adults of the oriental fruit fly, Bactrocera dorsalis. Fruit bagging can not only reduce pests and diseases, but also reduce the use of pesticides and the amount of use, improve fruit quality and product quality. After the dense sleeves are set in mid-June, the guava is bagged at 2 cm in diameter, and the star fruit is 3 cm in diameter. Bags are sprayed once before the bagging.
2, chicken worms. The mature larvae of Bactrocera dorsalis were plunged into the surface of the soil and 2-3 centimeters in the ground. The old mature larvae and cockroaches in the orchard were housed in the ground. Pay attention to the use of pesticides to control the orchard, especially ground treatment orchards banned the release of chickens.
3, trapping and killing adult sex traps. In areas with severe pest occurrence, from April to November, waste mineral water bottles, coke bottles and other containers were used, traps were built with cotton ball dampening attractant ether (methyl eugenol), and traps were added. Amount of soapy water. Hang 4 per acre and change lures every month. Can significantly reduce the amount of the next generation of pests.
2 food bait trapping. It is not yet spawned during the adult emergence period. 90% trichlorfon 1000 times or 2.5% deltamethrin EC 3000 times solution plus 30% brown sugar was used to spray the poisonous baits on the densely shaded part of the canopy, every 5 days for 7-8 times. Or 6.2% polymyxin bait 6-8 times, spray with a hand-held pressure sprayer coarse spray droplets, spray the lower part of the crown canopy at each point, about the size of the mouth (50 cm 2), every 7 days Spray once, starting from the fruit coloring period, until mature harvest. Can kill a large number of unspawned adults.
Third, chemical prevention
1, soil treatment. During April-October, 1 time every 2 months, mu using 15% chlorpyrifos granules (Lostburn) 0.75 kg, or 1.5% ciprofloxacin granules l kg mixed with 15 kg of fine sand, evenly spread the surface, kill Extermination of earthworm larvae and earthworms can effectively control the number of insect pests in the coming year.
2, crown spraying. Based on the monitoring results of insect attracting insect traps, 48% chlorpyrifos emulsifiable concentrate or 50% ciprofloxacine WP 1500 times solution or 2.5% deltamethrin 3000 times solution or 80% dichlorvos 800 times solution was selected every 10 hours - Spray once a day for 15 days. Turning of the fruit starts until the fruit is stopped 10-14 days before harvesting. The spraying time should be carried out at 9 to 10 o'clock in the morning or at 4 to 6 o'clock in the afternoon. 0.02% polymyxin bait 6-8 times, spray with a hand-held pressure atomizer, spray at the lower part of the crown, spray about the size of the mouth (50 cm2), spray every 7 days Once, from the fruit coloring period, till the ripe harvest.
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