How to use dinotefuran-containing household insecticide spray against flatheaded borers?

How to use dinotefuran-containing household insecticide spray against flatheaded borers?

Using dinotefuran spray against flatheaded borers requires different methods based on their life stage. Here is a staged control plan for adults and larvae:

Adult stage control (prevent egg laying)

Adults emerge in late spring and early summer, crawling, mating, and laying eggs on trunks. This stage is the best control window:

1. Timing: April-July, depending on local climate; start when adult flatheaded borers begin to appear.
2. Method: Spray dinotefuran-containing household insecticide evenly on trunks, main branches, and branch crotches until the bark surface is slightly damp.
3. Key areas: 1-2 meters above ground on the trunk, branch crotches, and rough cracked bark, these are where adults prefer to move and lay eggs.
4. Frequency: spray every 10-14 days, 2-3 times consecutively, covering the entire adult activity period.
5. Adults that contact the residue die within 24-48 hours, unable to lay eggs.

Larval stage control (kill larvae already inside)

If larvae have already burrowed under the bark, surface spraying is insufficient; more thorough treatment is needed:

6. Use a knife to scrape off dead bark, exposing the larval feeding site (brown powdery frass visible).
7. Locate fresh boreholes, fresh holes have brown, moist excrement around them.
8. Inject dinotefuran solution directly into boreholes using a syringe; a few drops per hole.
9. Alternatively, dip a cotton ball in the solution and insert it into the hole, then seal with mud or tape.
10. Larvae that contact the high-concentration solution die quickly.

Best control timing

• Spring (March-April): larvae become active; overwintering larvae begin feeding, good time for injection.
• Summer (May-July): adult emergence period; focus on surface spraying to prevent egg laying.
• Late summer (August-September): new-generation larvae burrow into bark; reapply injection to kill them.

Integrated control recommendations

Dinotefuran spray alone is not enough; combine with:

6. Strengthen water and fertilizer management, healthy trees produce more resin and have some resistance to flatheaded borers.
7. Prompt removal, prune and burn dead branches promptly to reduce pest sources.
8. Whitewashing, apply limewash to trunks in autumn and winter to reduce sunscald and frost cracks, discouraging egg laying.