Investigations on the biodiversity of entomophagous fauna of Spilarctia obiqua revealed the occurrence of twelve different natural enemies, out of which five Hymenoptera, four Dipterous parasitoids and three predators...Investigations on the biodiversity of entomophagous fauna of Spilarctia obiqua revealed the occurrence of twelve different natural enemies, out of which five Hymenoptera, four Dipterous parasitoids and three predators viz., two Hemiptera and one Neuroptera were found attacking different stages of the host. Biological notes on four parasitoids viz. Cotesia obliqua, Goniophthalmus halli, Meteorus sp. and Cotesia （glomeratus group） were also made. Estimation of field parasitization of the three species of entomophagous insect viz. C. obliqua, G. halli, and Meteorus sp. revealed that the C. obliqua was the most dominant parasitoid and maximum 21.6 per cent parasitization was observed during the month of October followed by 16% of by Meteorus and 14% by G. halli during February. Conservation of the biodiversity of these entomophagous fauna is advocated for BIPM programme.展开更多
文摘[目的]研究了停留时间对植物-生物膜氧化沟净化污水的影响,为植物-生物膜氧化沟的应用提供理论依据。[方法]3套植物-生物膜氧化沟系统中,系统1采用4 h停留时间,系统2采用8 h停留时间,系统3采用12 h停留时间。[结果]试验表明,该植物-生物膜氧化沟系统出水COD、NH4+-N、SS等的浓度分别在60、25和30 mg/L以下,均达到国家城镇二级污水处理厂排放标准;各污染物的去除随着停留时间的延长而提高。[结论]在CODS、S的去除上,12 h HRT和8 h HRT之间差异不显著,但为了加强脱氮除磷,建议采用12h水力停留时间。
文摘Investigations on the biodiversity of entomophagous fauna of Spilarctia obiqua revealed the occurrence of twelve different natural enemies, out of which five Hymenoptera, four Dipterous parasitoids and three predators viz., two Hemiptera and one Neuroptera were found attacking different stages of the host. Biological notes on four parasitoids viz. Cotesia obliqua, Goniophthalmus halli, Meteorus sp. and Cotesia （glomeratus group） were also made. Estimation of field parasitization of the three species of entomophagous insect viz. C. obliqua, G. halli, and Meteorus sp. revealed that the C. obliqua was the most dominant parasitoid and maximum 21.6 per cent parasitization was observed during the month of October followed by 16% of by Meteorus and 14% by G. halli during February. Conservation of the biodiversity of these entomophagous fauna is advocated for BIPM programme.
