The two-spotted spider mite,Tetranychus urticae Koch,is one of the most harmful pests in many agroecosystems worldwide.To effectively manage this pest,there is an urgent need to develop novel bio-active acaricides tha...The two-spotted spider mite,Tetranychus urticae Koch,is one of the most harmful pests in many agroecosystems worldwide.To effectively manage this pest,there is an urgent need to develop novel bio-active acaricides that support integrated pest management strategies targeting T.urticae.In this study,we explored the acaricidal effects of xenocoumacin 1 (Xcn1) on T.urticae and its predator Neoseiulus californicus using the highly puri?ed compound.Xcn1 was extracted and purified from the cell-free supernatant of the Xenorhabdus nematophila CB6 mutant constructed by the easy promoter activated compound identi?cation (easyPACId) method.When the concentration of Xcn1 exceeded 100μg mL~(–1),the survival rate of spider mite adults declined to below 40%and the fecundity was decreased by 80%at six days post-application.At concentrations of 25 and 50μg mL~(–1),Xcn1 signi?cantly impeded spider mite development by inhibiting the molt.However,neither concentration had any adverse effects on the survival or reproduction of the predatory mite N.californicus.The results from laboratory and semi-?eld experiments consistently demonstrated the effectiveness of the antimicrobial metabolite Xcn1 in controlling pest mites at both the molecular and physiological levels.Our study offers a promising possibility that combines the compatible biocontrol agents of Xcn1 and predatory mites for integrated pest mite control.展开更多
Three new species in the genus Tegonotus from China are described and illustrated： Tegonotus exbucklandiae sp. nov. infesting Exbucklandia populnea Brown（Hamamelidaceae）, Tegonotus parabaenae sp. nov. infesting Par...Three new species in the genus Tegonotus from China are described and illustrated： Tegonotus exbucklandiae sp. nov. infesting Exbucklandia populnea Brown（Hamamelidaceae）, Tegonotus parabaenae sp. nov. infesting Parabaena sagittata Miers（Menispermaceae） and Tegonotus pini sp. nov. infesting Pinus massoniana Lamb.（Pinaceae）. All species described here are vagrants on the surface of host leaves. Akey to the species of Tegonotus from China is provided.展开更多
A new species, Pediculaster kaiyangensis Guo ＆ Zhao sp. nov., in the genus Pediculaster Vitzthum, is described, which was collected in stored Chinese medicinal materials Polygala tenuifolia Willd from Kaiyang County,...A new species, Pediculaster kaiyangensis Guo ＆ Zhao sp. nov., in the genus Pediculaster Vitzthum, is described, which was collected in stored Chinese medicinal materials Polygala tenuifolia Willd from Kaiyang County, Guiyang City, Guizhou Province.展开更多
Medical gamasid mite is a general designation of a kind of non-insect arthropod and it can transmit many diseases.Dermanyssoidea is an important part of medical gamasid mite,so 126 new species in 9 genera have been ad...Medical gamasid mite is a general designation of a kind of non-insect arthropod and it can transmit many diseases.Dermanyssoidea is an important part of medical gamasid mite,so 126 new species in 9 genera have been added on the basis of Economic insect fauna of China and through combining many researches on Fauna of Gamasid Mites in China,so the research has enriched and extended the content of dermanyssoidea.展开更多
This paper deals with the validation and theoretical analyses of a simple method for calculating the intrinsic rate of increase, rm, of aphids and mites. This method does not require a detailed fecundity table data. T...This paper deals with the validation and theoretical analyses of a simple method for calculating the intrinsic rate of increase, rm, of aphids and mites. This method does not require a detailed fecundity table data. The value of rm can be estimated by the simple equation: rm=0.74ln (Md)/d, where d is the time from birth to first reproduction; Md is the number of female offspring produced per original female in 2d. This method was developed by Wyatt and White. We reached the following conclusions from our study: When the parameter, Md is less than 1, this equation is not appropriate for estimating rm of populations; When the parameter, Md is larger than 1 and about 70% or more of the reproductive contribution to the rm is achieved in 2d, the equation is appropriate for calculatng the rm of aphids and mites.As Md decreases, the required reproductive contribution to the rm in 2d corresponding to the constant 0.74 will increase. However, whether 70% or more of reproductive contribution to rm is achieved in 2d still is a problem for whole taxa of aphids and mites. Therefore, further siudy on reproductive distribution will be required for practical application of this method.展开更多
Three new species from Lishan Mountain, Shanxi, China are described and illustrated： Aculops kalimeris Xie sp. nov. on Kalimeris lautureana（Debx.） Kitam.（Compositae）, Aculops padus Xie sp. nov. on Prunus padus Li...Three new species from Lishan Mountain, Shanxi, China are described and illustrated： Aculops kalimeris Xie sp. nov. on Kalimeris lautureana（Debx.） Kitam.（Compositae）, Aculops padus Xie sp. nov. on Prunus padus Linn.（Rosaceae）, and Aculops sepius Xie sp. nov. on Vicia sepium Linn.（Fabaceae）,. Type specimens are deposited in the College of Agriculture and Life Science, Ankang University, Ankang City, Shaanxi Province, China.展开更多
基金supported by the National Natural Science Foundation of China(32070402)the Beijing Natural Science Foundation,China(6222052)。
文摘The two-spotted spider mite,Tetranychus urticae Koch,is one of the most harmful pests in many agroecosystems worldwide.To effectively manage this pest,there is an urgent need to develop novel bio-active acaricides that support integrated pest management strategies targeting T.urticae.In this study,we explored the acaricidal effects of xenocoumacin 1 (Xcn1) on T.urticae and its predator Neoseiulus californicus using the highly puri?ed compound.Xcn1 was extracted and purified from the cell-free supernatant of the Xenorhabdus nematophila CB6 mutant constructed by the easy promoter activated compound identi?cation (easyPACId) method.When the concentration of Xcn1 exceeded 100μg mL~(–1),the survival rate of spider mite adults declined to below 40%and the fecundity was decreased by 80%at six days post-application.At concentrations of 25 and 50μg mL~(–1),Xcn1 signi?cantly impeded spider mite development by inhibiting the molt.However,neither concentration had any adverse effects on the survival or reproduction of the predatory mite N.californicus.The results from laboratory and semi-?eld experiments consistently demonstrated the effectiveness of the antimicrobial metabolite Xcn1 in controlling pest mites at both the molecular and physiological levels.Our study offers a promising possibility that combines the compatible biocontrol agents of Xcn1 and predatory mites for integrated pest mite control.
基金supported by the National Natural Science Foundation of China (31160431)the Key Project of the Chinese Ministry of Education (211134)
文摘Three new species in the genus Tegonotus from China are described and illustrated： Tegonotus exbucklandiae sp. nov. infesting Exbucklandia populnea Brown（Hamamelidaceae）, Tegonotus parabaenae sp. nov. infesting Parabaena sagittata Miers（Menispermaceae） and Tegonotus pini sp. nov. infesting Pinus massoniana Lamb.（Pinaceae）. All species described here are vagrants on the surface of host leaves. Akey to the species of Tegonotus from China is provided.
基金supported by the Nomarch Special Talent Fund of Guizhou Province[(2004)07-39]
文摘A new species, Pediculaster kaiyangensis Guo ＆ Zhao sp. nov., in the genus Pediculaster Vitzthum, is described, which was collected in stored Chinese medicinal materials Polygala tenuifolia Willd from Kaiyang County, Guiyang City, Guizhou Province.
基金Supported by the National Natural Science Foundation of China(30760226)~~
文摘Medical gamasid mite is a general designation of a kind of non-insect arthropod and it can transmit many diseases.Dermanyssoidea is an important part of medical gamasid mite,so 126 new species in 9 genera have been added on the basis of Economic insect fauna of China and through combining many researches on Fauna of Gamasid Mites in China,so the research has enriched and extended the content of dermanyssoidea.
文摘This paper deals with the validation and theoretical analyses of a simple method for calculating the intrinsic rate of increase, rm, of aphids and mites. This method does not require a detailed fecundity table data. The value of rm can be estimated by the simple equation: rm=0.74ln (Md)/d, where d is the time from birth to first reproduction; Md is the number of female offspring produced per original female in 2d. This method was developed by Wyatt and White. We reached the following conclusions from our study: When the parameter, Md is less than 1, this equation is not appropriate for estimating rm of populations; When the parameter, Md is larger than 1 and about 70% or more of the reproductive contribution to the rm is achieved in 2d, the equation is appropriate for calculatng the rm of aphids and mites.As Md decreases, the required reproductive contribution to the rm in 2d corresponding to the constant 0.74 will increase. However, whether 70% or more of reproductive contribution to rm is achieved in 2d still is a problem for whole taxa of aphids and mites. Therefore, further siudy on reproductive distribution will be required for practical application of this method.
基金supported by Zhongtiaoshan State Forest Management Bureau of Shanxi Province, Houma, Shanxi, China, the Shaanxi Provincial Department of Science and Technology Foundation (2012JM3008)Ankang University Foundation (AYQDZR201213)
文摘Three new species from Lishan Mountain, Shanxi, China are described and illustrated： Aculops kalimeris Xie sp. nov. on Kalimeris lautureana（Debx.） Kitam.（Compositae）, Aculops padus Xie sp. nov. on Prunus padus Linn.（Rosaceae）, and Aculops sepius Xie sp. nov. on Vicia sepium Linn.（Fabaceae）,. Type specimens are deposited in the College of Agriculture and Life Science, Ankang University, Ankang City, Shaanxi Province, China.
