There are three kinds of aphids that harm the pear tree: pear birch, pear yellow mealybug and pear Chinese red-tailed grasshopper. These three kinds of locusts only harmed pear trees, and the occurrence of the common occurrence of the two-pronged locust and the yellow plague was serious. The original cercariae rarely occurred and the damage was light. The difference in form is as follows:
(1) Pyramidal bifurcation: 1 A wingless female is 2 mm in length, green or dark green, and the body is white wax powder. The compound eye is reddish-brown; the end of the antennae, the tail piece, the abdomen tube, and the leg joints, the ends of the tibial nodes, and the attachments are all black; there are dark green longitudinal bands in the center of the back. 2 winged female female body length 1.5-1.7 mm, 5 mm wingspan. The head, chest, tentacles, and ventral tube are pale black; the belly is light brown or tan, with brown markings. The forewing midrib is divided into two forks, so it is called bifurcation. 3 If the body is small, green, no wings, similar to the wingless female. 4 eggs about 0.7 mm long, oval, black, shiny.
(2) Pear yellow mealworms: 1 Pyriacidae is a multi-type aphid, divided into dry mother, common type, sex mother, and sexual type. Dry mother, common type, and sexual mother are all females. Similar in shape. Body length 0.7 to 0.8 mm, no wings, bright yellow, shiny, long oval. No belly tube, no tail. 2 Overwintering eggs (incubated as dry mother), about 0.33 mm in length, pale yellow. Eggs of common type and sex mothers are produced, and the body length is 0.26-0.3 mm. It is light yellow at the beginning and yellow-green. Produced sexual eggs, body length 0.36-0.42 mm, yellow-green. 3 The nymph is pale yellow and resembles adult, but it is small.
(3) Pears of Chinese native cercariae; winged females, head, chest black, green or yellowish green abdomen, abdomen short, tail short and round. Wingless, female, female, green or light brown, abdomen tube is short, tail piece is short and round.
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