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Trunk injection needs to understand
The use of trunk drilling and injection as a method for pest control is not only simple to implement but also highly effective. This technique helps save on pesticides, reduces labor, and avoids air pollution while protecting beneficial insects. It is particularly effective against dry pests such as beetles, borer insects, aphids, and mites. The **Pesticide Network** reminds everyone to pay attention to the following key points when carrying out this treatment:
First, the timing of the injection is crucial. It should be performed during the tree’s growing season, from bud break to leaf development. The best period is between April and August, depending on the local climate and the life cycle of the target pests. However, it is not advisable to inject during the dormant period before spring growth or after leaves have fallen.
Second, selecting the right **pesticides** is essential. Products with strong systemic properties, such as 50% methamidophos EC, 40% omethoate EC, 75% wettable carbofuran powder, 50% acaricidal emulsifiable concentrate, and 50% long-acting phosphorus emulsifiable concentrate, are recommended. Avoid using contact or stomach poisons that lack systemic action. Always choose the appropriate pesticide based on the specific pest you are targeting.
Third, the injection technique needs to be carefully followed. Use a drill with a diameter of 0.8–1.0 cm to create a hole at a 45-degree angle, about 15–50 cm above the ground, and drill it 8–10 cm deep into the trunk, reaching the heartwood. For larger trees, drill 3–5 holes in a spiral pattern around the trunk. Smaller trees may require just 1–2 holes. Inject the liquid using an inhaler or syringe, and if treating a large area, consider using a hole injection machine. After injection, seal the holes with wax, mud, or tape. These holes typically heal within two months.
Fourth, the amount of pesticide injected should depend on the tree’s size. Trees with a trunk diameter of 15 cm or more should receive 6–10 ml per plant. Trees with a diameter between 10–14 cm need 4–6 ml, and those under 10 cm should get 2–4 ml.
Finally, some important tips from the **China Pesticide Network**:
1. In cooler temperatures, you can apply 1–2 doses of the solution. However, during hot summer months, dilute the original pesticide 3–6 times to prevent over-concentration and potential damage to the tree.
2. For fruit trees, avoid injecting during the flowering period to protect pollinators and ensure proper pollination, which affects fruit set and yield. Stop injections 30 days before harvest to prevent residue.
3. For trees prone to sap flow, such as peaches or apricots, try to avoid drilling and instead use foliar sprays for pest control.
4. Never use pesticides that are sensitive to the tree species, as they may cause phytotoxicity.
By following these guidelines, you can effectively manage pests while minimizing environmental impact and ensuring the health of your trees.