What is the best way to manage potato leafhopper?

• A. Apply insecticide before leaf curl
• B. Treat crawlers with horticultural oils
• C. Use twice stabbed beetle as natural enemy
• D. Release parasitoid wasps

Answer: (A)

The best way to manage potato leafhopper is to apply a labeled insecticide while the leafhoppers are still on the new growth as crawlers, before the leaves begin to curl. This targets the most vulnerable stage and prevents the feeding that causes the characteristic leaf curl and stippling. Once curling has started, many nymphs are protected inside the curled tissue, and contact-based insecticides become much less effective, allowing damage to progress even if some insects are killed. While other methods like oils or natural enemies can contribute in some situations, they are typically less reliable and harder to time effectively in field conditions. Timely pre-curl treatment provides the strongest chance of protecting yield and quality.