Pear roundworm is also known as pear branch round shield borer, pear pill worm shell worm, rotifer shell worm, tree lice and so on. Homoptera Pterophoridae. It is widely distributed in the country, with the north being the most affected. Hosts include red wood, cherry blossoms, locusts, willows, poplars, cherries, etc.
[1] Hazard characteristics
Adults and nymphs are used to aspirate sap from branches, fruits and leaves. The branches are damaged, causing the cortex to burst, causing the leaves to fall and the branches to dry up. On apples and pear fruits, most of them are concentrated in calyxes and stems, forming purple-red patterns.
[2] Morphological characteristics
The female has a nearly rounded dorsal body, a grey-white to grayish-brown shell with a diameter of about 1.8 mm, and a shell point in the center of the shell. The body of the insect is flattened and round, orange-yellow. The male insect bug shell is oblong and oval, and the shell point is located in a section of the shell. The head of the insect is orange-yellow on the thorax and yellow in the abdomen, with 1 pair of wings. The body length is about 0.6 mm.
【3】Biological characteristics
The 1-year generation algebra varies by region and tree species. Generally 2 to 3 generations, Liaoning 2 generations, Hebei 3 generations, south 4 to 5 generations. 3 generations occur on apple trees and 2 generations on pear trees. Fixed nymphs at 1 instar or 2 nymphs overwinter on branches. The following spring nymphs continued to be harmful. Males pupate in mid-April and feather in early to mid-May; females give birth to nymphs under the shell of the worm, and each female adult generally produces 54 to 110 nymphs. The newborn nymphs puncture their mouthparts into the host tissue to aspirate the sap and secrete waxy wool, which soon form a clamshell. Predators mainly include red-spotted ladybugs and the like.
[4] Prevention and control measures
1. Strengthen quarantine to prevent insect seedlings from entering the planting ground.
2. Before the tree germinates, spray 5 ° Be stone sulfur compound on the garden with a large amount of insects. For the garden where the dotted pieces occur, when pruning in winter, cut off the affected branches.
3. During the occurrence of pests, spray prevention and control is carried out by using qilin "strike" or "qifa".
![In early September, strictly prevent the outbreak of pear roundworm insect infestation in apples, master scientific prevention and control technology, and avoid loss of first, the harmful characteristics of pear roundworm second, the morphological characteristics of pear roundworm third, the occurrence habit of pear roundworm[fig]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)