Tea tree tea pouch

The scientific name Xyleborus fornicatus Eichhoff is a Coleoptera, Aphididae. Alias ​​tea pouches. Distributed in Guangdong, Hainan, Sichuan, Fujian, Guizhou, Yunnan, Taiwan and other provinces. Guizhou and Hainan suffered heavy losses.

Host tea, ramie, lychee, willow, artichoke, cocoa, iron knife wood and so on. It is an important pest on tea trees in China and the world.

As a result, the larvae are harmed by tea strains that are growing poorly. They form more annular tunnels, affect nutrient transport, weaken the tree potential, and reduce yield and quality. It is characterized by the appearance of a small round hole with a diameter of 2mm. There are often small pieces of wood chips at the mouth of the hole. When the humidity is high, there are water spots around the hole. Damaged heavy tea gardens were destroyed.

Morphological characteristics Female body length 2.4mm, cylindrical, body brown to dark brown, with a strong luster. The depth of the frontal depression is moderate; the frontal area is flat, the bottom is finely meshed, there is no middle keel, the frontal face has less engraved points, and the frontal hair is sparse and slender. Telescopic hammer shape. The length of the thoracodorsal plate is slightly less than the width, the length-to-width ratio is 0.9:1, the dorsal aspect of the anterior border and the anterior side form a semicircle, and the entire back plate is shield-shaped; the anterior arch of the dorsal plate is curved and the squamous tumors are connected. Horizontal rows; the bottom of the engraved area is finely meshed, and the engraved spots are not obvious, and there is no obvious backline. Small scutellum flat triangle. The length of the elytra is 1.6 times longer than the length of the prosthodontic plate. The esophageal groove is slightly depressed. The engraved point in the groove is slightly larger and denser. The fin base is engraved with a concave point, then it gradually protrudes and becomes small in the back of the wing; The slope is smoothly sloping and there is no obvious edge on the slope. The center of the engraved center between each groove has 1 hair. Egg length 0.6mm, oval, white to light yellow. The last instar larvae are 3-4mm long, with a white body. They are obese and have brown heads and their feet are degraded. Barely long. Female 蛹 2.4mm, male 蛹 1.2mm, oval-shaped, initially milky white, later turned brown.

Habits Habitat Hainan 3-4 generations, Guangdong 6 generations old, overlapping generations. Mainly in the middle and late November of November, the adults began to winter in the damaged tea tree tunnels, and a few larvae survived winters, and some individuals passed winters. In February of the following year, the temperature increased, and the average daily temperature was 20-22°C. A large number of overwintering adults began to drill and injure tea trees and new tunnels appeared. After the emergence of adult feathers, they stayed in the original tunnel for 6-7 days and then exited in sunny afternoons. They liked to enter the leaves or branches of 1-2 year old branches. Break into the aperture of about 2mm, round, from the exit to the time required to re-enter 10-180 minutes, from the break into the pit into the tunnel takes 12-36 hours, the production of 1-4 eggs in the tunnel, the average daily Temperature 30 °C, egg period 6 days. The mature larvae in the tunnel phlegm, the average daily temperature of 30 °C, the flood season of 4-5 days, the completion of a generation takes about 50 days. The management of extensive tea gardens is heavy. Usually 1-2 years old branches and trunks are often victimized. After picking tea and ripening autumn shoots, a large number of insect populations. Hainan suffered heavy damage from January to February and from April to June.

Prevention methods (1) Strengthen tea garden management, increase tree vigor, and can significantly increase tea insect resistance. When the worm branches are removed in time, the concentrated burned cuts are cut off. The heavy tea tree should pay attention to pruning, heavy fertilization, and the promotion of latent buds on the branches to rejuvenate the trees as soon as possible. (2) Chemical control The overwintering generation of this worm and the emergence of first-generation adult eclosion and outlet were relatively neat. In addition, after pruning the virgin garden on the basis of fertilizing material, 50% of the rice oil is dispersed in a timely manner to the branches and the ground to prevent and control adult worms. (3) Using the injection method to use a medical syringe to inject 50% of the dichlorvos EC 50 times with the 8th needle, one by one, and the insecticidal rate is as high as 94%. (4) Pay attention to the protection and use of natural enemies.