Fall is the most serious period of occurrence and harm of Bactrocera dorsalis, and it is also a critical period for prevention and control. Citrus fruit damage caused by Bactrocera can cause fruit rot, early fruit drop, resulting in serious yield loss. This year, the time of the occurrence of Bactrocera dorsalis in Wujiang City was significantly advanced and the number of adults significantly increased. The prevention and control of Bactrocera dorsalis should be highly regarded and the hazards should be mitigated.
Occurrence
This year, the occurrence of Bactrocera dorsalis was characterized by a mild early period and a rapid increase recently. According to the data from three monitoring sites of Spodoptera Sinensis in Wuping City, the cumulative number of adult adults was estimated to be 3 from the beginning of May to the end of August, which is equivalent to that of 2008, but 15 adults were found on September 1-7. The amount of trapping in 2008. According to systematic monitoring results, this year's fourth generation of Bactrocera dorsalis will enter the adulthood period around September 10, and will peak in late September. The period of occurrence will continue until the maturity of citrus, which is the most serious year in recent years. .
Prevention advice
Comprehensive use of chemical control 2 to 3 times drug. The first dose was sprayed on the canopy at about 9 to 10 a.m. from 9:00 am to 1000 to 1500 times of farmland music (522.5 g/l Chlorhexidine Chlorpyrifos Cream). The second drug was administered around September 25, with a focus on Bactroceros, which is also known as red spider, mixed with 2.5% cyhalothrin (2500 times) and 1.8% avermectin (1500 times) on the canopy. Re-emerging areas and some late-maturing varieties should be organized for the third time before and after October 10, and the pharmaceuticals should be the same for the second time. Citrus was stopped 15 days before picking to ensure the safety of fruit consumption.
Physical control of 3 to 5 suspended pheromone traps per mu orchard or flies will stick to yellow plates (including sex pheromone fly attracting ethers) 3, can effectively trap the fruit fly adults.
When agricultural control of fruits matures, the fruit drop in the orchard is removed once every 3 days. Drop the fruit drop in the sink for more than 8 days, or soak for 5 days with 50% ciprofloxacin WP 5000 times to reduce the number of insects in the coming year.
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