When are control efforts often considered too late to prevent significant localized damage from locusts?

Answer

When a swarm is visible and migrating over heavily populated agricultural areas

Experience shows that by the time a swarm is visible and migrating over populated agricultural areas, control efforts are often too late to prevent significant localized damage; proactive work in breeding grounds is necessary beforehand.

When are control efforts often considered too late to prevent significant localized damage from locusts?

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The pandemic threatens the people of East Africa -- and now locusts ...

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