超级稻甬优6号褐飞虱种群繁殖速率的密度制约效应

[目的]研究超级籼粳杂交稻甬优6号褐飞虱种群繁殖速率的密度制约效应。[方法]在超级籼粳杂交稻甬优6号不同生育期即分蘖期、孕穗期、灌浆期分别接入不同虫量褐飞虱,调查并分析超级稻褐飞虱种群繁殖速率及其变化动态。[结果]分蘖期：褐飞虱孕穗期、灌浆期种群数量随分蘖期种群基数的增加而逐渐增加;当灌浆期褐飞虱种群密度升高达到一定限度（〉250头/丛）时,其乳熟期种群数量随该密度的加大而呈下降趋势;超级稻甬优6号褐飞虱种群发展呈现中间快、两头慢的特点。孕穗期：褐飞虱种群发展在孕穗至灌浆期是随着其基数密度升高而升高,但到乳熟期相关性表现却不显著;超级稻中后期褐飞虱种群仍具有高繁殖能力,对水稻产量潜存极大威胁。灌浆期：褐飞虱种群密度〈70头/丛时,其种群发展仍随着其基数密度升高而升高,对产量仍潜存较大威胁。[结论]研究结果为建立和健全褐飞虱监测预警体系、经济有效生态控制超级稻褐飞虱发生危害、提高褐飞虱持续控制能力提供理论依据。

Density Restriction Effects of Reproductive Rate of Rice Brown Planthopper Population in Super Rice Yongyou NO.6

[Objective]The paper was to study the density restriction effects of reproductive rate of rice brown planthopper(BPH) population in super indica and japonica hybrid rice Yongyou N0.6.[Method] Different amounts of BPH were inoculated into super indica and japonica hybrid rice Yongyou N0.6 during tillering,booting and filling stage,respectively.The reproductive rate and variation dynamics of BPH in super rice was also investigated and analyzed.[Result] Tillering stage: the population quantity of BPH during bo...