Experiments were conducted by using RAM Air Sampler for Use with Moving Vehicle to estimate field disease severity of wheat powdery mildew during 2002-2005. Results showed that there was significant correlation betwee...Experiments were conducted by using RAM Air Sampler for Use with Moving Vehicle to estimate field disease severity of wheat powdery mildew during 2002-2005. Results showed that there was significant correlation between field disease index and trapped spore number. Therefore, two models relating field disease index to spore number trapped were constructed using data from 2002 and 2005, or 2003 and 2004, respectively. These two models can be used to estimate field disease indexes of wheat powdery mildew in different years when disease severity is different.展开更多
橡胶盔蚧（Parasaissetia nigra Nietner）近年来在西双版纳地区对橡胶树造成严重危害。本试验采用田间定株观察和人工气候箱饲养的方法，对其生物学特性及温度对橡胶盔蚧卵发育的影响进行了研究，为该害虫的预测预报及化学防治提供理...橡胶盔蚧（Parasaissetia nigra Nietner）近年来在西双版纳地区对橡胶树造成严重危害。本试验采用田间定株观察和人工气候箱饲养的方法，对其生物学特性及温度对橡胶盔蚧卵发育的影响进行了研究，为该害虫的预测预报及化学防治提供理论依据。结果表明：橡胶盔蚧在西双版纳地区没有越冬现象，1年发生4代，各代历期变化为60～110d，每雌平均产卵1345粒。在18～32℃范围内，该虫卵的发育历期与温度呈显著的负相关（r=-0．9781^＊＊＊），36℃时卵不能孵化。卵的发育起点温度和有效积温分别为13．40℃和69．76日·度。最佳防治适期为从当年第1代初孵若虫始盛期即2月下旬到4月上旬低龄若虫高峰期结束，每10d进行1次药剂防治，连续防治4～5次。展开更多
文摘Experiments were conducted by using RAM Air Sampler for Use with Moving Vehicle to estimate field disease severity of wheat powdery mildew during 2002-2005. Results showed that there was significant correlation between field disease index and trapped spore number. Therefore, two models relating field disease index to spore number trapped were constructed using data from 2002 and 2005, or 2003 and 2004, respectively. These two models can be used to estimate field disease indexes of wheat powdery mildew in different years when disease severity is different.
文摘橡胶盔蚧（Parasaissetia nigra Nietner）近年来在西双版纳地区对橡胶树造成严重危害。本试验采用田间定株观察和人工气候箱饲养的方法，对其生物学特性及温度对橡胶盔蚧卵发育的影响进行了研究，为该害虫的预测预报及化学防治提供理论依据。结果表明：橡胶盔蚧在西双版纳地区没有越冬现象，1年发生4代，各代历期变化为60～110d，每雌平均产卵1345粒。在18～32℃范围内，该虫卵的发育历期与温度呈显著的负相关（r=-0．9781^＊＊＊），36℃时卵不能孵化。卵的发育起点温度和有效积温分别为13．40℃和69．76日·度。最佳防治适期为从当年第1代初孵若虫始盛期即2月下旬到4月上旬低龄若虫高峰期结束，每10d进行1次药剂防治，连续防治4～5次。
