Bactrocera citri. Diptera, awn suborder, fruit fly, fruit fly subgenus. Host range includes sweet orange, sour orange, grapefruit, Wenzhou tangerine, red orange, tangerine, Beijing tangerine, grapefruit, bergamot, pumpkin and so on. The harm of Bactrocera dorsalis to different host plants is different. Oranges are the most harmful, followed by precocious oranges and grapefruit. It is harmful for larvae to eat the petals in the fruit, which leads to the fruit turning yellow before maturity, falling off early and losing its edible value. In severe cases, all fruits will fall off, which will seriously affect the yield and quality of fruits. Eggs or larvae mainly spread with citrus fruits and pupae in the soil. Larvae * * * is divided into 3 instars. The mature larvae are about 16 mm long and consist of ivory 1 1 knots. The front end is thin and the back end is thick, which is maggot-like. Black hooks often retract into the chest. The anterior valve is located on both sides of the chest, curved in a fan shape, and the valve plate is kidney-shaped, with three brown rectangular holes on the left and right, surrounded by four tufts of hair.

Bactrocera citri. Also known as yellow flies, fruit maggots and so on. The host range includes guava, mango, peach, carambola, banana, apple, fragrant fruit, pear, plum, annona, sweet orange, lime, orange pomelo, lemon, citron, apricot, loquat, persimmon, black date, red fruit, jujube, peach and grape. Larvae eat pulp, which causes the fruit to rot and fall off, which is extremely serious. If it is not controlled, it will often lead to crop failure. The adult's head is yellow or yellowish brown, and the scapula and dorsal leaves are completely yellow. Egg white, about 1mm, 0. 1 mm wide. The body length of the third instar mature larva is 7 ~11mm; The pupa is oval, 4 ~ 5mm long,1.5 ~ 2.5mm wide and light yellow. It is harmful for larvae to eat petals in fruit, which leads to the fruit turning yellow before maturity, falling off early and losing edible value, which seriously affects the yield and quality of fruit.

Citrus bud maggot. Also known as orange bud gall midge, flower maggot, etc. Adults lay eggs on citrus buds, and the hatched larvae damage the buds, making the buds swell and shorten, the petals deform, unable to develop, blossom and bear fruit normally, and finally the flowers fall off.