蝗害——指稻蝗为害水稻,在我县自五十年代末以来,一直危害轻微,但近年来有危害加重趋势,例如在山区和大部分丘陵稻田其受害损失已超过了其他害虫所造成的损失。因此,对蝗害的抬头务必引起足够的重视。 一、发生概况 1、密度大 近年发生密度不断上升,为害不断扩大。七十年代只是部分山区可见, Grasshoppers - rice paddy-damaging rice, has been a minor hazard in our county since the late 1950s but has been aggravated in recent years, for example in mountainous areas and most of the hilly paddy fields, where losses have outlived other pests Loss. Therefore, the rise of locust must pay enough attention. First, the occurrence of an overview of 1, the density in recent years, the density continues to rise, continue to expand damage. Seventies only visible in some mountains,