稻纵卷叶螟是我县的主要害虫,对水稻高产稳产威胁很大,一般减产二,三成。一、发生规律稻纵卷叶螟在我县一年发生五代,第一代蛾于5月中下旬至6月上旬盛发,主要在双熟制早稻上产卵繁殖,发生量少,为害轻微。第二代蛾在6月下旬至7月上中旬盛发,在双季早稻和部分早栽单季中晚稻上产卵为害,三熟制早稻是受害重点。盛发期间正是梅雨季节,有利其发生,所以数量大,为害最凶。第三代蛾于7月下旬至8月中旬盛发,主要在单季中晚稻、晚熟早稻和早栽后季稻上产卵为害,迟栽猛发的单季稻是受害的重点。这一代发生量最大,为害也很凶,但遇上高温干旱的天气,为害则轻。 Rice leaf roller is the main pest in our county, a high threat to the stability of rice is very large, the general cut two or three into. First, the occurrence of law Rice leaf roller occurs in our county five generations a year, the first generation of moths in late May to early June Shengfa, mainly in double-crop early rice spawning, the occurrence of small, minor damage . The second-generation moths flourished in late June to mid-July, causing spawning in double-cropped early-season rice and part-time early-season single-cropping late-season rice. Shengfa period is the rainy season, beneficial to its occurrence, so a large number, the most harmful damage. The third generation of moths flourished from late July to mid-August, mainly in the single season of late rice, late mature early rice and early rice after planting spawning season, late rice flipping single crop is the focus of victimization. The generation of this generation is the largest, the damage is also fierce, but in the event of high temperature and drought weather, damage is light.