摘要
调查表明,三种缨小蜂对稻飞虱的发生为害具有显著的抑制作用。稻虱缨小蜂发生稳定、量大。世代发育起点和有效积温:雌蜂11.3℃和159.1日度,雄蜂10.7℃和160.8日度。平均每雌产卵20粒,选择寄主较宽,稍偏好褐飞虱卵,对抑制早、晚稻中、后期飞虱发生起重要作用。长管稻虱缨小蜂数量最多,但波动大,5～6月高峰,寄生较专,主要是有效地抑制早稻中期和晚稻后期白背飞虱的发生。雌蜂世代发育起点11.7℃,有效积温185.2日度,平均产卵13粒。拟稻虱缨小蜂数量较少,以6～7月较多,每雌产卵5～12粒,对早、晚稻后期的褐飞虱起一定抑制作用。三种缨小蜂多在上午6～8点羽化,羽化头天产卵占总产卵量的八成以上,均能行孤雌生殖。杂草中的多种飞虱卵是三种缨小蜂的渡夏和过冬寄主。合理施药、适当留草是保护利用三种缨小蜂的有效措施。缨小蜂是稻飞虱卵期的主要寄生性天敌。1980～1983年,我们在佛山市近郊,对其中群体数量较大的稻虱缨小蜂Anagrus nilaparvatae,长管稻虱缨小蜂Anagrus sp,拟稻虱缨小蜂Angrus Paranilaparvatae的消长规律及保护利用进行了考查。现将四年考查结果整理报导,供作参考。
Investigation shows that three species Anagrus nilaparuatae, Anagrus sp. A. paranilaparuatae pay a important role in the control of planthoppers in rice fields. The developmental zero and effective accumulative temperature of generation of female A. nilaparvatae are 11.3℃ and 159.1 day-degree, the malc's are 10.77℃ and 160.8 day-degree, respectively. Average egg laid by a female are 20. This parasite has rather large population number and stable density in each year. Its host range is wider but it prefers to parasite the eggs of rice brown planthoppcr, so that it plays an important role in controling the density of rice brown planthopper in the middle stage and late stage of spring rice and autumn rice growth. The parasite Anagrus sp. is the one with largest numbers and density Change liger, The developmantal zero and effective accumulative temperature of generation of female are 11.7℃ and 185.2 day-degree respectively. Thirteen eggs on average are laid by a female. The population density peak mainly falls in May to June. The host preference is special. It suppresses effectively the density of white backed planthopper in middle stage and late stage of spring rice and autumn rice growth. The number of A. paranilaparvatae is low, and mainly presents in June and July. A female laid five to twelve eggs. it suppresses the density of rice brown planthopper in the late stage of spring rice and autumn rice growth. The emergence of three parasites almost aeeurs at six to eight o'clock in the morning, 80％ of their eggs were laid at the first day, The eggs of planthopper ia the weeds are the main host for these parasitics to atersummer and auerwinter. So that reasonably use insecticides and properly remaining weeds around the rice fields are the effective measures for protecting and utilizing these parasitics.
出处
《昆虫天敌》
CSCD
1991年第4期156-161,共6页
Natural Enemies of Insects
