Control of citrus fruit fly in May

Citrus fruit fly is commonly known as citrus maggot, and the killed fruit is called maggot fruit. Before 2009, it was a national plant quarantine pest, harming four types of citrus: pomelo, lime, navel orange and broad-skinned citrus, among which limes and sweet oranges suffered the most. Its larvae feed on the petal in the fruit, making the fruit yellow before ripening, reddish in yellow, and seriously rotten. The citrus fruit drop rate is about 10% in general years and more than 60% in serious years, which is a serious threat to the development of citrus industry in our county. In view of this, the following control suggestions are put forward: the first and middle of May is the peak period of adult Eclosion, which is generally concentrated from 9 am to 12:00, especially in the sunny weather after rain, and the Eclosion reaches its peak when the temperature is high. On May 5-8, 100 grams per mu of crystal trichlorfon was used, and on May 13-16, 100 ml of chlorpyrifos per mu was used to spray 50 kg of water on the ground to block the emergence of adults. Chemical trapping and killing of adults with sweet and sour medicine solution from May 20, using hanging bottle trapping, the formula of trapping agent is composed of orange juice + brown sugar and 90% trichlorfon aqueous solution, and the formula ratio is trichlorfon: orange juice: brown sugar: water = 0.215 515. 100. Put the decoy into a disposable plastic cup, pass through the edge of the plastic cup with wire, and tie the ends of the wire to the branches of the orange tree. Disposable plastic cups should be hung on the shady side or north of the middle layer of the orange tree crown, 20-25 plastic cups per mu should be hung evenly, and the trap should be changed every 10 days or so. Note: each application must be completed within 2-3 days, strengthen the management of livestock and poultry and water sources, so as to avoid human, animal, poultry and fish poisoning accidents. All orange orchards or lots where the above pesticides are applied should be placed in a conspicuous position.