Summer locusts have happened to large areas in Henan, Hebei and Shandong provinces in north China. Airplanes and ground control facilities are applied, and the target is to prevent the locusts from flying and expanding. In Hebei, the airplanes spread 20 tons of pesticides, covering an area of 2.67 million hectares. Shandong has organized more than 10,000 people working on the pest control...