水稻是我县的重要粮食作物,其中中稻占水稻总面积的90％左右。近年来,稻螟为害相当普遍,尤以三代三化螟造成中稻白穗的损失最为严重,1963年和1964年,中稻因白穗减产约达一千万斤。所以,采取有效措施,防治三代三化螟的为害,就成为我县水稻增收的重要问题。 Rice is an important grain crop in our county, of which medium rice accounts for about 90% of the total rice area. In recent years, the damage caused by the rice borer is quite common, especially for the three generations of rice stem borer caused the most serious loss of white spike, in 1963 and 1964, due to white spike mid-yield reduction of about ten million kilograms. Therefore, taking effective measures to prevent and control the damage of the three generations of rice stem borers has become an important issue for increasing income of rice in our county.