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Pest & Disease Library · Solutions

Stem Borers Control in Corn

For stem borers in corn, Vegalab recommends scouting and a natural program built on **Larva Control**. Apply Larva Control to whorls and foliage at egg-hatch; manage stubble to cut carry-over.

Common crops affected

  • Corn

Why it matters

Stem borers tunnel corn stalks causing deadheart and lodging, with larvae protected once inside.

When it appears

At egg-hatch/early instars in whorls, before larvae bore into stalks.

How to identify it

  • “Deadheart” — the central whorl/shoot dies while outer leaves stay green.
  • Shot-hole feeding and frass in whorls and leaf sheaths.
  • Entry/exit holes with frass on stems and stalks; tunnels visible when split.

How to manage it

  1. Apply Larva Control to whorls and foliage at egg-hatch;
  2. manage stubble to cut carry-over.
  3. Monitor early, treat at the right window above, and use cultural measures (sanitation, airflow/drainage or resistance/rotation as relevant).

Recommended Vegalab program

RoleProductUse
Primary controlSpore ControlApply Larva Control to whorls and foliage at egg-hatch;
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Product claims, rates, and availability vary by jurisdiction; always follow the applicable label.

Frequently asked questions

What's the best natural control for stem borers in corn?

Vegalab Larva Control, applied at the timing above with thorough coverage.

When should I treat?

At egg-hatch/early instars in whorls, before larvae bore into stalks.

Can it be used in IPM / low-residue programs?

Yes — it's a natural, low-residue product that fits IPM; follow the approved local label.

Is availability the same everywhere?

Claims and availability vary by jurisdiction — always follow the approved local label.

Related

Full guide: Stem Borers