HAIKOU, Aug. 12 (Xinhuanet) -- A long-awaited rainfall on Friday has not bring too much joy to the farmers of the drought-hit Lingao County in south China's island province of Hainan, because a large area of their cropland was ruined a locust plague. More than 800 mu (53.3 hectares) of seedlings in the county were eaten up by the locusts and the sugarcane fields were also stricken by the plague. Lingao is not the only place that has been stricken by locusts. According to statistics from the provincial Department of Agriculture,16 counties and cities in the province, covering an area...