Orange fruit fly belongs to the family Diptera, and mainly parasitizes more than 200 kinds of fruits and vegetables such as citrus, wolfberry, apricot, peach, pear and grape, and poses a great threat to various fruits and peaches.
First, the morphological characteristics
The adult body is 7 to 8 mm in length and the whole black and yellow phase. Most of the back of the chest is black, and the yellow U-shaped markings are evident. The female oviduct is well developed and consists of 3 sections. Egg spindle, milky white, about 1 mm long, about 0.1 mm wide. The larvae are cricket-shaped, yellow-brown when old, about 10 mm in length, yellow-white. It is a cofferdam and is about 5 mm long. Eggs are milky white and pointed at both ends. One end is more pointed than the other, spindle-shaped and about 1 mm long. The insect is good spherical fruit, followed by cylindrical, oval and so on. Such as orange fruit, peaches and other spherical fruit rich in Wuxi area, is the most favorite fruit of Bactrocera dorsalis.
Second, habits
According to the climatic conditions in Wuxi, the worm's reproductive ability is strong, and there is no doubt that overwintering, the insect's sub-cold point at -17 °C, Wuxi, the lowest underground temperature is only about 0 °C. Female adults live for 60 to 70 days, sexual maturity is reached 15 days after emergence, and most mating peaks are between 19:30 and 22:30. A female can lay between 400 and 1000 eggs, and the spawning period lasts up to 1 month. The hatching rate can reach 85%. The larvae can develop completely within 1 day. After the third instar matures, they leave the host's fruit and plough into the soil. The depth is about 5 cm. The pupa period is 11 to 13 days. After emergence, the ground is drilled. The adult stage of Bactrocera dorsalis is the longest, so the best period for its control is adulthood.
Third, control methods
1. Lures adult (1) brown sugar baits. Add poison baits made of 3% brown sugar in 1000 times liquid of 90% trichlorfon and spray densely shaded parts of the canopy. Once every 5 days, 3 times in a row. (2) methyl eugenol attractant. The small bagasse bagboard cubes soaked with methyl eugenol (ie, traps) plus 3% malathion or dibromophosphoric acid solution were suspended from the tree, 50 pieces per square kilometer, and were suspended twice a month during the adult stage. The male fruit fly can be basically eliminated. (3) crown spray. In the period when the fruit is close to yellow, it is sprayed with 2,500 times of cypermethrin or 1200 times of farmland to spray the whole crown. 10 times a day, a total of 3 times. The drug was stopped 20 days before fruit harvest.
2. Artificial control (1) The fruit orchards endangered by Bactrocera dorsalis should be cleared of fruit in time during the fruit-fall period. At the same time, the fruit on the tree should be removed. It is necessary to adopt incineration and deep burial measures to deal with these victim fruits. Shallow burial to prevent it from continuing to emerge. (2) If the winter orchard land is idle, it is necessary to turn over the earth, turn the earthworm to the soil surface, or eat it or let it die.
3. Ground application in the initial stage of fruit fly larvae plague or adult emergence, use phoxim granules 4 ~ 5 kg mix 25 ~ 30 kg dry fine soil, evenly spread the ground, once every 7 days , continuous 2 or 3 times. Since phoxim is easily decomposed, field use is best in the evening.
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