Pyramid

Pyrus bifidium, also known as Pygmy Limulus, belongs to the order Homoptera and Polygonaceae, and is a major pest in the early stages of pear growth. All pear regions in the country are distributed, and pear fields in Liaoning, Hebei, Shandong, and Shanxi are common, and individual pear orchards suffer the most. The adults and larvae live on the front of the leaves. The affected leaves curl up to the front and become tubular. Most of the leaves damaged by the aphids can no longer be stretched, they are easy to fall off, and it is easy to cause the creepers to infiltrate. Sapling after victimization. Affect the crown formation and postpone the results.

[Morphological characteristics] Wingless females are about 2 mm in length, green, dark green or yellow-brown, often sparsely white wax powder, the frontal head is not obvious, the mouthparts are black, and there is a dark green vertical band in the center of the back. . The winged female has a female body about 1.5 mm long with a wingspan of about 5 mm. The head and chest are black, the abdomen is green, the frontal tumor is slightly prominent, the mouthparts are black, and the red eyes are complex. The forelimb midrib is divided into two parts, so it is called bifurcation. If the beak is similar to a female of a wingless female, the body is small and the wing has a large breast with winged buds.

Life history and habits? Pear pods occur in more than 10 generations in 1 year. They use the eggs to survive winter in the buds of pear trees or twigs. When the pears sprout in the following year, they hatch into Ruoqiang. The clusters are damaged by the white buds, and the leaf period concentrates on tenderness. The leaf is damaged by the frontal surface and causes the leaves to curl up into a tube shape. It begins to appear winged after about half a month of flowering. It can be transferred to other hosts from May to June, and it can be found from September to October in autumn. The summer host returned to the pear tree. In November, sexual lice emerged and the ovipositor spawned between the branches and buds.

Control methods
1. When the number of occurrences is not too large, early removal of the victimized leaves, centralized treatment, and elimination of locusts.
2, do a good job before flowering spray control. During this period, all wintering crickets should be sprayed without hatching. The type and concentration of the pesticide should be 10% ciproline (one-time net) 3000 to 5000 times liquid, and 20% speed kill 1000 to 1500 times liquid.
3, protect and use natural enemies. There are many kinds of natural enemies in the locust, and when the larvae are more dense, it is obvious that the protection and use of natural enemies is not necessary when spraying.

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