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水稻二化螟(见第21页)属鳞翅目,螟蛾科,俗名钻心虫、蛀心虫、蛀秆虫等,是我国水稻上危害最为严重的常发性害虫之一,以长江流域及南方稻区发生较重,分布特点是丘陵山区发生较多。不同稻区之间的分布也有差异,一般混栽稻区、单季稻区和间作稻区发生比较严重,平原双季连作稻区发生比较轻。形态特征雌成虫体长12毫米～15毫米,额部有一突起。头部、胸部和前翅黄褐或灰褐色,前翅外缘有7个小黑点,有少量具有金属光泽的鳞片。腹部纺锤形。雄成虫体长10毫
Rice stem borers (see page 21) belong to Lepidoptera, Pyralidae, common name bore worms, borer worms, moth stem borer, etc., is one of the most serious pests on rice in our country one of the most serious, with the Yangtze River valley And the occurrence of heavier rice in the South, the distribution is characterized by more occurrence in hilly areas. There are also differences in the distribution between different rice areas, the general mixed rice area, single-cropping rice and inter-cropping occurred more serious, plain double cropping area occurred relatively light. Morphological characteristics Female adult body length 12 mm ~ 15 mm, forehead has a protrusion. The head, chest and forelimbs are yellowish-brown or beige, with seven small black spots on the outer margin of the forewing wing and a small amount of scales with metallic luster. Abdominal spindle shape. Male adult body length of 10 milliliters