Aerial photo taken on May 14, 2020 shows a farmer picking litchi at Sanmenpo Town in Qiongshan District of Haikou City, south China's Hainan Province. Harvest season for litchi has come in northern Hainan. (Xinhua/Guo Cheng)

A farmer picks litchi at Sanmenpo Town in Qiongshan District of Haikou City, south China's Hainan Province, May 14, 2020. Harvest season for litchi has come in northern Hainan. (Xinhua/Guo Cheng)

A farmer picks litchi at Sanmenpo Town in Qiongshan District of Haikou City, south China's Hainan Province, May 14, 2020. Harvest season for litchi has come in northern Hainan. (Xinhua/Guo Cheng)

A farmer picks litchi at Sanmenpo Town in Qiongshan District of Haikou City, south China's Hainan Province, May 14, 2020. Harvest season for litchi has come in northern Hainan. (Xinhua/Guo Cheng)

Farmers load litchi at Sanmenpo Town in Qiongshan District of Haikou City, south China's Hainan Province, May 14, 2020. Harvest season for litchi has come in northern Hainan. (Xinhua/Guo Cheng)

Farmers load litchi at Sanmenpo Town in Qiongshan District of Haikou City, south China's Hainan Province, May 14, 2020. Harvest season for litchi has come in northern Hainan. (Xinhua/Guo Cheng)