Prevention and control method for bactrocera dorsalis in northern area

The invention relates to a method for preventing and controlling bactrocera dorsalis in northern areas, which comprises the following steps of: 1, arranging a trapping point in each of east, west, south, north and middle directions in an orchard, and hanging a sex pheromone trap at 2/3 height of a tree body; 2, three trapping defense lines are arranged on the periphery of the orchard at equal intervals, each trapping defense line is provided with trapping points in eight directions of east, south, west, north, southeast, northeast, northwest and southwest outside the orchard, degradable yellow plates or plastic bottles are hung on the trapping points, and insect physical trapping adhesives are sprayed on the yellow plates or the plastic bottles; and step 3, uniformly spot-spraying the prepared protein bait agent on the back surfaces of leaves and branches on the shady surfaces of the fruit trees, 15 points per mu, 20 milliliters per point, and spraying once every 10 days. According to the method, prevention a