桃下毛瘿螨(Acalitus persicae Luo et Jiang)是北京地区为害桃芽的新害螨。植物保护学报18卷据调查在平谷、海淀、石景山、丰台、延庆和昌平等县、区桃园均有不同程度的发生,以平谷县大华山乡后北宫桃园发生较重,1985年发生面积已达200...桃下毛瘿螨(Acalitus persicae Luo et Jiang)是北京地区为害桃芽的新害螨。植物保护学报18卷据调查在平谷、海淀、石景山、丰台、延庆和昌平等县、区桃园均有不同程度的发生,以平谷县大华山乡后北宫桃园发生较重,1985年发生面积已达2000余亩,被害严重的桃树死芽率达60一70%,轻的在20%,当年经济损失20余万元,是桃树生产中急待解决的问题。作者于1985一1988年对该靖的生物学特性及防治技术作了调查研究,结果如下。一、被容症状桃下毛瘦蜻主要为害桃芽,在芽鳞片内侧为害,幼芽被害后,随被害芽生长出现畸形扭曲,展开更多
Two-spotted spider mite （Tetranychus urticae Koch） （Acari： Tetranychidae） is a very serious pest worldwide, causing considerable damage to vegetables, flowers and fruit crops. The application of plant extracts to...Two-spotted spider mite （Tetranychus urticae Koch） （Acari： Tetranychidae） is a very serious pest worldwide, causing considerable damage to vegetables, flowers and fruit crops. The application of plant extracts to control insects can be an effective alternative. In this study, the efficacy of an extract from Juglans regia L. （Juglandecaea） was tested as an alternative to conventional acaricides. Using two different methods, bioassays were used to determine the effects of varying concentrations J. regia （1%, 3%, 6%, 12%） of the extracts. Experiments were carried out using 3 cm diameter leaf disks of Phaseolus vulgaris L. In addition, the effects of the extract on mite reproduction and oviposition were investigated. As a result, in the leaf dipping method, the 12% concentration of the extract caused the highest mortality of nymph （90%） and adult （83.00%） stages. For the spraying method, the mortality of adults at the same concentration was 100%. In bioassays at lower concentrations, the adult mites laid lower numbers of eggs in comparison to the untreated mites. The highest effect occurred at concentration of 12% and the lowest effect was at 1%. The extract was no observed ovicidal effect.展开更多
文摘桃下毛瘿螨(Acalitus persicae Luo et Jiang)是北京地区为害桃芽的新害螨。植物保护学报18卷据调查在平谷、海淀、石景山、丰台、延庆和昌平等县、区桃园均有不同程度的发生,以平谷县大华山乡后北宫桃园发生较重,1985年发生面积已达2000余亩,被害严重的桃树死芽率达60一70%,轻的在20%,当年经济损失20余万元,是桃树生产中急待解决的问题。作者于1985一1988年对该靖的生物学特性及防治技术作了调查研究,结果如下。一、被容症状桃下毛瘦蜻主要为害桃芽,在芽鳞片内侧为害,幼芽被害后,随被害芽生长出现畸形扭曲,
文摘Two-spotted spider mite （Tetranychus urticae Koch） （Acari： Tetranychidae） is a very serious pest worldwide, causing considerable damage to vegetables, flowers and fruit crops. The application of plant extracts to control insects can be an effective alternative. In this study, the efficacy of an extract from Juglans regia L. （Juglandecaea） was tested as an alternative to conventional acaricides. Using two different methods, bioassays were used to determine the effects of varying concentrations J. regia （1%, 3%, 6%, 12%） of the extracts. Experiments were carried out using 3 cm diameter leaf disks of Phaseolus vulgaris L. In addition, the effects of the extract on mite reproduction and oviposition were investigated. As a result, in the leaf dipping method, the 12% concentration of the extract caused the highest mortality of nymph （90%） and adult （83.00%） stages. For the spraying method, the mortality of adults at the same concentration was 100%. In bioassays at lower concentrations, the adult mites laid lower numbers of eggs in comparison to the untreated mites. The highest effect occurred at concentration of 12% and the lowest effect was at 1%. The extract was no observed ovicidal effect.
