The worst invasion by desert locusts in decades has hit Kenya, Ethiopia and Somalia. The swarms are destroying crops and could cost millions of dollars to contain

Ben Curtis/AP/Shutterstock

Photographer Ben Curtis

Agency AP Photo

THIS farmer can only watch in dismay as locusts in swarms of biblical proportions devour her crops outside Katitika village in Kenya. It is the worst invasion by desert locusts (Schistocerca gregaria) in decades to hit Kenya, Ethiopia and Somalia, destroying crops in an area already facing food insecurity. Somalia has declared a national emergency.

Hundreds of millions of locusts are forming swarms bigger than cities. Stopping them will require the aerial spraying of pesticides, which could cost $70 million, says the United Nations Food and Agriculture Organization (FAO).

It fears …