Caterpillars & Larvae: Stopping Defoliation Before It Starts

What are crop-damaging larvae?

"Larvae" covers the immature, feeding stage of many insect pests — caterpillars (the larvae of moths and butterflies such as armyworms, loopers, budworms and hornworms) and the grubs of some beetles. It is this stage, not the adult, that consumes plant tissue. Larvae are most vulnerable to control when small, before they burrow into protected sites or reach later, tougher instars.

How to identify larval damage

• Ragged holes, chewed leaf margins, and skeletonised leaves
• Frass (dark droppings) on leaves and in leaf whorls
• Boring holes in fruit, pods or stems, sometimes with entry wounds and rot
• The larvae themselves — on leaf undersides, in growing points, or at the soil line

Scout for eggs and small larvae early; controlling young stages is far more effective than fighting large larvae after damage is done.

Why timing matters

Larval populations build quickly and later instars are harder to control and cause the most damage. Monitoring — including for adult flights where relevant — lets you target the vulnerable early larval window. Rotating modes of action protects the tools you have from resistance.

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