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.