不久前,在河南省召开的1999年夏蝗发生趋势会上,专家指出:继去年蝗虫大发生后,今年夏蝗在河南省仍可能重发。 据悉,去年防治后,遗留秋残蝗面积仍达13.3万余公顷,较往年增加3万公顷以上,平均残蝗密度为每公顷650只。去年秋冬以来的持 Not long ago, in the trend of summer locust occurrence in Henan Province in 1999, experts pointed out: Following the locust occurrence last year, this summer locust may still be reopened in Henan Province. It is reported that after the prevention and treatment last year, the remaining area of ​​autumn residues locust still reached more than 133,000 hectares, an increase of more than 30,000 hectares compared with previous years, with an average density of 650 locusts per hectare. Since last autumn’s holding