First, eliminate adult insects. During the adult stage in June and July, adults are manually removed. Different species have different behaviors. For Anoplophora glabripennis, adults should be killed during the day, while for Sang Tianniu, it's more effective to target them at night. This timing helps ensure maximum effectiveness as they are more active or vulnerable at these times.
Second, attack the eggs. For eggs and larvae that haven’t yet entered the xylem, a hammer can be used to gently tap the egg groove, breaking the eggs open. Alternatively, trichlorfon can be applied directly to the egg-laying area to kill newly hatched larvae. Observing the spawning habits of the insect is crucial. Anoplophora glabripennis typically lays its eggs 0.5 meters above the ground on the bark, first creating a "T" shape before laying eggs inside. In contrast, Sang Longhorn beetles create a "U" shaped opening and often lay eggs in clusters, especially on the upper parts of the bark.
Third, plug the tunnels. For larvae that have already entered the xylem, use a wire to probe each tunnel and kill the larvae directly. Another method involves inserting a cotton ball soaked in 80% dichlorvos EC into the new frass hole, then sealing it with wet mud. If multiple holes are present, focus on the most recent one. After 7-10 days, if new frass appears, repeat the treatment to ensure complete eradication.
Fourth, inject liquid insecticide. Remove the sprayer from a hand sprayer and replace it with a conical tube, or use a large syringe to inject the insecticide directly into the borehole. The amount of liquid injected depends on the size of the hole. Effective chemicals include trichlorfon and dichlorvos, which are highly toxic to larvae and provide long-lasting control.
Fifth, insert poison sticks. Depending on the size of the wormholes, insert 1-2 zinc phosphide poison sticks. Break off any exposed non-medical parts and push the stick tightly into the hole to prevent poisonous gas from escaping. If there are many frass holes, locate the latest one along the feeding path. Plug the hole ahead of it with small twigs to stop larvae from moving and prevent gas leakage, then place the poison stick in the most recent hole.
Sixth, drill and inject. For poplar trees with a trunk diameter over 5 cm, use borehole injection. Suitable insecticides include omethoate, fenvalerate, and imidacloprid. Drill at a 45-degree angle 30 cm from the base of the trunk, to a depth of 6-8 cm. For trees under 15 cm in diameter, drill 1-2 holes; for those between 15-30 cm, drill 2-3 holes; and for trees over 30 cm, drill 4-5 holes. Inject about 5 ml per hole, then seal with wet mud after injection.
Seventh, apply dry base mud. In mid-July, prepare a thick yellow clay mixed with water and add a slightly diluted solution of dichlorvos or omethoate. Apply this mixture evenly around the base of the tree, covering the trunk within 2 meters of the ground. This prevents Tian Long from biting into the bark and inhibits egg hatching, offering an additional layer of protection against infestation.
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