First, eliminate adult insects. During the adult stage in June and July, manual removal is effective. Different species have different behaviors: for *Anoplophora glabripennis*, adults should be killed during the day, while *Sang Tianniu* (a local name for a longhorn beetle) adults are more active at night. This timing helps ensure maximum effectiveness when targeting them.
Second, target egg-laying sites. For eggs and larvae that haven’t yet entered the xylem, use a hammer to gently strike the egg slit, which can break the eggs. Alternatively, apply trichlorfon to the egg site to kill newly hatched larvae. Monitoring the spawning habits of the pest is crucial. *Anoplophora glabripennis* typically lays eggs in the bark about 0.5 meters above the ground, creating a "T" shaped opening before laying eggs inside. In contrast, *Sang Longhorn* beetles create a "U"-shaped hole and often lay multiple eggs in the upper part of the bark, leaving a messy appearance.
Third, plug the entry holes. For larvae already inside the xylem, insert a thin wire into each tunnel to kill them. Another method is to place a cotton ball soaked in 80% dichlorvos EC into the new frass hole, then seal it with wet mud. If multiple holes are present, focus on the most recent one. After 7–10 days, if fresh frass appears, repeat the treatment to ensure full eradication.
Fourth, inject liquid insecticides. Remove the sprayer from a hand sprayer and replace it with a conical tube or insert a large syringe directly into the boring hole. Inject the insecticide to poison the larvae. The amount injected depends on the size of the hole. Commonly used chemicals include trichlorfon and dichlorvos, both of which are effective against larvae.
Fifth, insert poisoned sticks. Depending on the size of the wormholes, insert 1–2 zinc phosphide poison sticks. Break off any non-medicated parts and press them tightly into the hole to prevent toxic gas from escaping. If there are many frass holes, locate the most recent one along the feeding path. Before inserting the poison stick, fill the previous hole with small branches to block larvae movement and gas escape. Then place the poison stick in the latest hole for maximum effect.
Sixth, drill and inject. For poplar trees with a trunk diameter over 5 cm, drilling and injecting insecticides is recommended. Suitable insecticides include omethoate, fenvalerate, and imidacloprid. Drill at a 45-degree angle 30 cm above the ground, reaching a depth of 6–8 cm. Trees under 15 cm in diameter require 1–2 holes, while those between 15–30 cm need 2–3 holes, and trees over 30 cm need 4–5 holes. Inject approximately 5 ml of solution per hole, then cover the hole with wet mud to seal it.
Seventh, apply dry base mud. In mid-July, prepare a thick yellow clay mixture with water and add a slightly diluted solution of dichlorvos or omethoate. Apply this evenly around the base of the tree, covering the trunk up to 2 meters above the ground. This method prevents *Tian Long* from biting into the bark and inhibits the hatching of larvae, offering long-term protection.
These combined methods provide an effective, multi-pronged approach to managing infestations, ensuring both immediate and long-term control of harmful insects.
Yunnan NBC Agricultural Development Co., Ltd deals in (heat pump air drying) Yunnan Plateau agricultural products. Including Flowers And Leaves, fruits, rhizomes, poultry meat, aquatic products and other drying products. All products are free of additives, agricultural residues and phosphorus and sulfur. It has obtained the national SC food safety production certification, and at the same time, it is produced according to the international standards, reaching the export level, and can be OEM.