A locust is seen on a plant during the arrival of a swarm of locusts at a cultivation area in Dhamar province, Yemen, June 6, 2020. (Photos: Xinhua)

Locusts are seen in the air as they arrive at a cultivation area in Dhamar province, Yemen, on June 6, 2020.

Locusts are seen on the ground as they arrive at a cultivation area in Dhamar province, Yemen, June 6, 2020.

Locusts are seen on the ground as they arrive at a cultivation area in Dhamar province, Yemen, June 6, 2020.

A farmer tries to drive out locusts from his farm after their arrival at a cultivation area in Dhamar province, Yemen, June 6, 2020.

A swarm of locusts are seen in the air as they arrive at a cultivation area in Dhamar province, Yemen, June 6, 2020.

A farmer tries to drive out locusts as they arrive at a cultivation area in Dhamar province, Yemen, June 6, 2020.

A swarm of locusts are seen in the air as they arrive at a cultivation area in Dhamar province, Yemen, June 6, 2020.

A farmer tries to drive out locusts from his farm after their arrival at a cultivation area in Dhamar province, Yemen, June 6, 2020.

A child holds a locust after a swarm of locusts arriving at a cultivation area in Dhamar province, Yemen, June 6, 2020.

A child holds a locust after a swarm of locusts arriving at a cultivation area in Dhamar province, Yemen, June 6, 2020.

A swarm of locusts are seen in the air as they arrive at a cultivation area in Dhamar province, Yemen, June 6, 2020.