How to prevent and cure tea longicorn beetles?

Tea longicorn beetles alias neem longicorn beetles, glittering longicorn beetles, thieves, etc., distributed in Jiangsu, Anhui, Zhejiang and other places, the larvae eat branches and roots, causing tree weakness, the upper leaves are withered and yellow, the buds are thin and sparse, the branches are easy to break, and when serious, the whole plant dies. Let's take a look at how to control tea longicorn beetles.

Morphological characteristics of tea longicorn beetles

Tea longicorn beetle adults about 30 mm long, dark brown, glossy, with brown dense short hairs. There is a longitudinal ridge in the center of the head. The compound eyes are black, and the two eyes almost meet at the top of the head. The ends of the middle and upper segments of the antennae protrude outward and produce a small thorn. The antennae of the female are similar to the body length. The egg is about 4 mm long, about 2 mm wide, long oval, milky white. The last instar larvae have a body length of 37-52 mm, cylindrical shape, light yellow head, milky white chest and abdomen, wide forechest, 4 yellowish-brown patches at the front of the hard skin plate, a zigzag pattern at the posterior margin, and sarcomatous protuberances in the middle chest, posterior chest and 1-7 ventral segment. The pupa is 25mm long, milky white to light ochre.

The living habits of tea longicorn beetles

Tea longicorn beetles usually produce one generation in two or more years. The overwintering adults appear from late April to early July in the following year, lay eggs at the end of May, begin to hatch in the first ten days of June, overwinter in late October, pupate from late August to the end of September in the next year, Eclosion only from the middle of September to the middle of October, and do not begin to mate until late April of the third year. The newly hatched larvae eat under the skin, enter the xylem 1-2 days later, and then go down into a tunnel to more than 33 cm underground. The mature larvae rise to a tunnel of 3cm to 10cm on the surface and make a round calcareous cocoon, which is molted and pupated in the cocoon. In mountain tea gardens and old and weak tea gardens, the old tea trees with exposed roots and necks were seriously injured.

Control methods of tea longicorn beetles

1. Before the adult worm is unearthed, use quicklime 5kg, sulfur powder 0.5kg, cow gum 250g, 20 liters of water to blend into a white coating, coated on the branch or root neck 50cm from the ground, can reduce the longicorn beetle oviposition.

2. Cultivate the soil at the root of the tea tree in time to prevent the root neck from being exposed and adults laying eggs.

3. Trapping and killing adults with lights during the occurrence of adults or capturing them manually in the early morning.

4. 40-50 times of dichlorvos, dimethoate and other insecticides are injected into the excretory hole, and then sealed with mud to kill the larvae.

5. Cut the hundred roots into 4cm long or Pinellia ternata stems and leaves, and stuffed them into wormholes, which can also kill larvae.