摘要
在亚热带浙江金衢盆地的丘陵双季水稻田的早、晚稻期间研究了白背飞虱的被寄生和被捕食作用下的存活率。早、晚稻白背飞虱卵被缨小蜂寄生率分别为 1 1 %和 1 6 % ,被捕食及未知因子死亡率分别为 2 3%和 1 6 %。早稻白背飞虱长翅型和短翅型成虫被螯蜂、线虫和捻翅虫寄生的总寄生率分别为 1 3%和 34% ,晚稻分别为 35%和 4 9% ,短翅型的被寄生率显著高于长翅型 ,晚稻高于早稻。晚稻期间螯蜂对长翅型成虫的寄生率高于短翅型 ,而线虫对其的寄生率则相反。存活分析表明 :白背飞虱的死亡主要发生在孵化期 ,从初产卵至成虫初期的累计存活率 ,早稻上为 2 %～ 1 8% ,晚稻上为 1 %～ 7% ;卵期至 1龄若虫和 4～ 5龄若虫期是影响季节、代次间白背飞虱累计存活率变动的两个关键时期 ;卵期至 1龄若虫存活率和成虫期被线虫寄生率是除生殖力外决定种群增长率的两个重要因子。
The seasonal pattern of parasitism of the white-backed planthopper, Sogatella furcifera (Horváth), was investigated in a subtropical double cropping of rice ecosystem in hilly region Jinghua-Quzhou Basin, Zhejiang, China. In the early rice and the late rice, the parasitism of S. furcifera eggs by Anagrus spp. averaged 11% and 16% respectively, while mortality caused by Cyrtorrhinus lividippennis predation and rice plant physiological and unknown causes averaged 23% and 16%, the total mortality of eggs was 35% and 32%, respectively. In the early rice, the mean parasitism of macropterous and brachypterous adults by dryinids, nematods and strepsipterans was 13% and 34%, respectively. In the late rice, such means was 35% and 49%, respectively. Parasitism of brachypters was significantly higher than that of macropters in both rice. Also the parasitism in the late rice was higher than the corresponding wing-forms in the early rice. In the late rice, significant higher proportion of macropterous adults than of brachypterous adults was parasitized by dryinids, vice versa for parasitism by nematods. The stage to stage survival analysis showed that the most mortality occurred around hatching, and cumulative from egg to pre-adult survivorship was estimated as 2%-18 % in the early rice and 1%-7% in the late rice. Key factor analysis showed that survivals during hatching to the 1st instar nymph, and the 4th-5th instar were the two key periods for cumulative survival of the planthopper.Further-more, survivorship at newly-hatched nymphal stage and parasitism of adults by nematods were two significant factors, besides fecundity, influencing population growth rate of the planthopper.
出处
《中国生物防治》
CSCD
北大核心
2004年第1期21-26,共6页
Chinese Journal of Biological Control
基金
国家自然科学基金重点项目 (396 30 2 0 0 )
国际科学基金项目 (C/ 1730 - 2 )
