The Experts below are selected from a list of 243 Experts worldwide ranked by ideXlab platform
A Hongchang - One of the best experts on this subject based on the ideXlab platform.
-
Preliminary studies on population dynamics of the scale insect Parasaissetia nigra on rubber trees and influencing factors in Xishuangbanna
2010Co-Authors: A HongchangAbstract:Investigations on population dynamics of the rubber tree scale insect Parasaissetia nigra were carried out from April 2005 to March 2008 in Xishuangbanna rubber plantation.The results showed that this scale insect occurred in this region year by year.The population density of the scales at the same month was significantly different among different years(One-Way ANOVA,p0.05).The density reached highest in July and October in 2007,at 108.5±11.9 and 107.2±5.5 individuals per branch,respectively.There were three density peaks for the scales of various stages.As for the nymphs,the first peak appeared in early April,and the second in the middle of July,and the third in October(December in 2006).The density peaks of the adult scales occurred in January,June and October,respectively.Analysis combined with climatic factors demonstrated that the temperature was the main factor affecting the population dynamics of the scale insects in dry seasons,and the intensity and frequency of rainfall was the key factor restricting the growth of scale populations in wet seasons.
-
Investigation and Identification of Parasitic Wasps of Parasaissetia nigra Nietner in Xishuangbanna
Chinese Journal of Tropical Crops, 2009Co-Authors: A HongchangAbstract:An investigation of the species and distribution of parasitic wasps of Parasaissetia nigra Nietner attacking rubber trees was made in the rubber plantations and rubber holdings in the state farms, small or collective holders, and Yunnan Institute of Tropical Crops in Xishuangbanna, Yunnan Province from 2007 to 2009. Collected and identified were 2 458 individuals of parasitic wasps of P. nigra Nietner which are grouped into 12 species of 11 genera and 4 families. Diversinervus elegans and Tetrastichus murakamii were found to be the dominant species parasitizing P. nigra Nietner; Microterys rufofulvus, Coccophagus ceroplastae, Anysis saissetiae, Coccobius sp. and Marietta sp. were common species. The morphological characters of the dominant and common species are illustrated, and a key to the species of parasitic wasps of P. nigra Nietner in Xishuangbannna is provided.
-
Study on the population dynamics and spatial distribution of Parasaissetia nigra Nietner on rubber plant.
Journal of Yunnan Agricultural University, 2009Co-Authors: Zhang Zubing, Li Guohua, A Hongchang, Zhou Ming, Hou JianyongAbstract:Annual monitoring was conducted on population dynamics of Parasaissetia nigra Nietner from 2005 to 2006 in Jinghong of Xishuangbanna Prefecture.The result indicated that it had 3 generations.The period of population peak of each generation occurred separately in early April,late July and late October.The duration of the second generation was the longest.The duration of the first generation of the largest population was the shortest.The spatial distribution of P.nigra population was studied by the methods of diffusion coefficient,Lloyd's mean crowding and index of patchiness,Iwao's patchiness and Taylor's law.The results of all the methods showed that the spatial pattern of P.nigra was aggregated distribution on rubber plants.Based on the analysis of spatial distribution,the optimum number for sampling under different tolerances was determined and sequential sampling model was established by Iwao theory sampling model.
-
Studies on the structure and distribution of the parasitic wasp populations of Parasaissetia nigra
2009Co-Authors: A HongchangAbstract:Through massive screening and point-surveys,the structure and distribution of Parasaissetia nigra Nietner and its parasitic wasp populations were studied.The results showed that there were 10 species of parasitic wasps,of which there were 2 dominant species,4 common species and 4 rare species.Diversinervus elegans and Tetrastichus murakamii were defined as the dominant parasitic wasps,occupying 64.32% and 11.76% of the total species population density,respectively.Spatial distribution of the parasitic wasp populations is different at different orientations of the rubber tree.The parasitic rate on average was higher at the top than at the bottom.The parasitic rate on average is the highest to the south and lowest to the north.The spatial distribution of P.nigra and its parasitic wasps were determined by Taylor power and Iwao's regression equation.The results were the same and showed that the spatial distribution patterns of both P.nigra and the parasitic wasps belong to aggregative distribution.The higher the parasitic wasps' density,the higher the aggregative degree.
-
A survey of the natural enemies of Parasaissetia nigra on rubber trees in Xishuangbanna
2007Co-Authors: A HongchangAbstract:The main state-owned rubber plantations(Jinghong,Mengyang,Mengpeng,Mengla,Ganlanba,Dongfeng) and private rubber farms(Sandashan,Gadong,Gasa,Menghan) in Xishuangbanna and rubber seedlings in Xishuangbanna tropical flowers and plants garden were surveyed.The results indicated that there were about 31 species of natural enemies on Parasaissetia nigra,9 species of which were new records in Yunnan Province.These could be divided into 11 families,7 orders and 2 classes.The most abundant species were Chrysoperla carnea(Stephens),Aschersonia kawakamii Sawada and parasitic wasps,accounting for 26.43%,32.35% and 27.48% of the total natural enemies,respectively.C.carnea and parasitic wasps were the best potential species that may be used to control P.nigra in the future.The survey laid the foundation for the biological control of P.nigra.
Takumasa Kondo - One of the best experts on this subject based on the ideXlab platform.
-
Description of two new species of Cryptinglisia Cockerell (Hemiptera: Coccomorpha: Coccidae) associated with rosemary, Rosmarinus officinalis L. (Lamiaceae) in Colombia.
Zootaxa, 2018Co-Authors: Takumasa Kondo, José Mauricio Montes Rodríguez, María Fernanda Díaz, Oscar Javier Dix Luna, Edgard Palacio GoenagaAbstract:In this study, two new species of soft scale (Hemiptera: Coccomorpha: Coccidae) associated with rosemary, Rosmarinus officinalis L. (Lamiaceae) from Colombia, Cryptinglisia corpoica Kondo & Montes sp. nov. and Cryptinglisia ica Montes & Kondo sp. nov. are described and illustrated based on the adult female. Two other coccid species, namely Parasaissetia nigra (Nietner) and Saissetia coffeae (Walker), are newly recorded on rosemary. An identification key is presented to all species of soft scale that have been reported on Rosmarinus spp. An updated key to soft scale insects of the genus Cryptinglisia Cockerell is provided also.
-
Species delimitation in asexual insects of economic importance: The case of black scale (Parasaissetia nigra), a cosmopolitan parthenogenetic pest scale insect
PloS one, 2017Co-Authors: Yen-po Lin, Takumasa Kondo, Thomas L. Semple, Robert Edwards, Lyn G. CookAbstract:Asexual lineages provide a challenge to species delimitation because species concepts either have little biological meaning for them or are arbitrary, since every individual is monophyletic and reproductively isolated from all other individuals. However, recognition and naming of asexual species is important to conservation and economic applications. Some scale insects are widespread and polyphagous pests of plants, and several species have been found to comprise cryptic species complexes. Parasaissetia nigra (Nietner, 1861) (Hemiptera: Coccidae) is a parthenogenetic, cosmopolitan and polyphagous pest that feeds on plant species from more than 80 families. Here, we implement multiple approaches to assess the species status of P. nigra, including coalescence-based analyses of mitochondrial and nuclear genes, and ecological niche modelling. Our results indicate that the sampled specimens of P. nigra should be considered to comprise at least two ecotypes (or "species") that are ecologically differentiated, particularly in relation to temperature and moisture. The presence of more than one ecotype under the current concept of P. nigra has implications for biosecurity because the geographic extent of each type is not fully known: some countries may currently have only one of the biotypes. Introduction of additional lineages could expand the geographic extent of damage by the pest in some countries.
-
The % pair-wise distances (uncorrected) in COI between and within clades of Parasaissetia nigra.
2017Co-Authors: Yen-po Lin, Robert D. Edwards, Takumasa Kondo, Thomas L. Semple, Lyn G. CookAbstract:The % pair-wise distances (uncorrected) in COI between and within clades of Parasaissetia nigra.
Lyn G. Cook - One of the best experts on this subject based on the ideXlab platform.
-
Species delimitation in asexual insects of economic importance: The case of black scale (Parasaissetia nigra), a cosmopolitan parthenogenetic pest scale insect
PloS one, 2017Co-Authors: Yen-po Lin, Takumasa Kondo, Thomas L. Semple, Robert Edwards, Lyn G. CookAbstract:Asexual lineages provide a challenge to species delimitation because species concepts either have little biological meaning for them or are arbitrary, since every individual is monophyletic and reproductively isolated from all other individuals. However, recognition and naming of asexual species is important to conservation and economic applications. Some scale insects are widespread and polyphagous pests of plants, and several species have been found to comprise cryptic species complexes. Parasaissetia nigra (Nietner, 1861) (Hemiptera: Coccidae) is a parthenogenetic, cosmopolitan and polyphagous pest that feeds on plant species from more than 80 families. Here, we implement multiple approaches to assess the species status of P. nigra, including coalescence-based analyses of mitochondrial and nuclear genes, and ecological niche modelling. Our results indicate that the sampled specimens of P. nigra should be considered to comprise at least two ecotypes (or "species") that are ecologically differentiated, particularly in relation to temperature and moisture. The presence of more than one ecotype under the current concept of P. nigra has implications for biosecurity because the geographic extent of each type is not fully known: some countries may currently have only one of the biotypes. Introduction of additional lineages could expand the geographic extent of damage by the pest in some countries.
-
The % pair-wise distances (uncorrected) in COI between and within clades of Parasaissetia nigra.
2017Co-Authors: Yen-po Lin, Robert D. Edwards, Takumasa Kondo, Thomas L. Semple, Lyn G. CookAbstract:The % pair-wise distances (uncorrected) in COI between and within clades of Parasaissetia nigra.
Li Guo-hua - One of the best experts on this subject based on the ideXlab platform.
-
Interactions between nigra scale Parasaissetia nigra and ant in Xishuangbanna of Yunnan Province,Southwest China
Chinese Journal of Ecology, 2011Co-Authors: Li Guo-huaAbstract:An investigation was conducted to study the ant associated with nigra scale(Parasaissetia nigra) in Yunnan rubber planting area.A total of 22 ant species were collected,belonging to 15 genera and 4 subfamilies,and Oecophylla smaragdina was the dominant species.Field survey found that the rubber trees with ants presented had higher probability damaged by the scale.To understand the interactions between the scale and ant,two rubber trees with ants and scales in a rubber plantation were selected,and the survey showed that there was a positive correlation between the amounts of the scales and ants.The more the ants presented,the more serious damage caused by the scales.The distance from the ant nests also affected the quantity of the scales,i.e.,the nearer the nest,the more the scale individuals presented.After ant isolation,the 2nd generation mortality of the scales and the parasitism rate of chalcids decreased,and accordingly,the scale population increased.These results demonstrated that the existence of ant protected the nigra scale,and their relationship was mutualism.
-
Identification and Control of a Scale Insect in Xishuangbanna Rubber Plantation of Yunnan Province
Tropical Agricultural Science & Technology, 2005Co-Authors: Li Guo-huaAbstract:Recently, a scale insect was outbreak in Xishuangbanna rubber plantation of Yunnan province. Accordingto the female adult morphological characteristics, it was identified as Parasaissetia nigra Nietner, belongs to Homopeteraorder, coccidae family, Parasaissetia genus and put forward the measure of pest management.
Vera R. Dos S. Wolff - One of the best experts on this subject based on the ideXlab platform.
-
A Survey of Scale Insects (Hemiptera: Coccoidea) in Citrus Orchards in São Paulo, Brazil
Florida Entomologist, 2018Co-Authors: Luís Fernando V. Almeida, Ana Lúcia Benfatti Gonzalez Peronti, Nilza Maria Martinelli, Vera R. Dos S. WolffAbstract:Many scale insects (Hemiptera: Coccoidea), including species of great economic importance, are associated with plants of the genus Citrus in citrus producing regions around the world. Revision and updating of lists of scale insect species based on field surveys contributes to improving their management and is an important tool for preventing their introduction into non-infested areas. The purpose of this study was to present an updated list of scale insect species in citrus orchards in Sao Paulo, Brazil. Samples were collected between Sep 2014 and Sep 2015, and between Sep 2016 and Jul 2017, from rural and urban areas and from nurseries in 27 municipalities in the principal citrus-producing regions in the state of Sao Paulo, known as the “citrus belt.” A total of 22 species in 6 families were identified: (1) Coccidae: Ceroplastes floridensis Comstock, Coccus viridis (Green), Parasaissetia nigra (Nietner), Saissetia coffeae (Walker); (2) Diaspididae: Acutaspis scutiformis (Cockerell), Aonidiella aurantii (Maskell), Chrysomphalus aonidum (L.), Lepidosaphes gloverii (Packard), Melanaspis smilacis (Comstock), Parlatoria cinerea Hadden in Doane & Hadden, Parlatoria ziziphi (Lucas), Pinnaspis aspidistrae (Signoret), Pseudaonidia trilobitiformis (Green), Selenaspidus articulatus (Morgan), Unaspis citri (Comstock); (3) Lecanodiaspididae: Lecanodiaspis rugosa Hempel; (4) Monophlebidae: Icerya purchasi Maskell; (5) Ortheziidae: Praelongorthezia praelonga (Douglas), and (6) Pseudococcidae: Ferrisia virgata (Cockerell), Leptococcus minutus (Hempel), Planococcus citri (Risso), and Pseudococcus cryptus Hempel. This is the first report of L. gloverii , P . nigra , P. aspidistrae , P. trilobitiformis , and P. cryptus on citrus in Sao Paulo, and of M. smilacis on Rutaceae host plants. Parlatoria ziziphi , S . articulatus , and U. citri were the most frequently observed species on the sampled plants, and they are among those that reached high levels of infestation throughout the collection period. A review of all scale insects associated with Citrus spp. in Brazil also is included. Resumo Muitas cochonilhas (Hemiptera: Coccoidea), incluindo especies de grande importância economica, sao registradas em associacao com plantas do genero Citrus nas regioes produtoras da frutifera ao redor do mundo. Fornecer listas revisadas e atualizadas de especies de cochonilhas, baseadas em levantamentos de campo, alem de contribuir para o manejo das mesmas, e um importante instrumento para que se possa prevenir a sua introducao em areas nao infestadas. O objetivo desse trabalho foi apresentar uma lista atualizada de especies de cochonilhas em pomares citricos localizados no estado de Sao Paulo, Brasil. As amostras foram coletadas entre set de 2014 e set de 2015, e entre set de 2016 e jul de 2017, em areas rurais, areas urbanas e viveiros de 27 municipios pertencentes as principais regioes produtoras de citros do estado de Sao Paulo, conhecida como “cinturao citricola.” Foram identificadas 22 especies pertencentes a seis familias: (1) Coccidae: Ceroplastes floridensis Comstock, Coccus viridis (Green), Parasaissetia nigra (Nietner), Saissetia coffeae (Walker); (2) Diaspididae: Acutaspis scutiformis (Cockerell), Aonidiella aurantii (Maskell), Chrysomphalus aonidum (L.), Lepidosaphes gloverii (Packard), Melanaspis smilacis (Comstock), Parlatoria cinerea Hadden in Doane & Hadden, Parlatoria ziziphi (Lucas), Pinnaspis aspidistrae (Signoret), Pseudaonidia trilobitiformis (Green), Selenaspidus articulatus (Morgan), Unaspis citri (Comstock); (3) Lecanodiaspididae: Lecanodiaspis rugosa Hempel; (4) Monophlebidae: Icerya purchasi Maskell; (5) Ortheziidae: Praelongorthezia praelonga (Douglas), y (6) Pseudococcidae: Ferrisia virgata (Cockerell), Leptococcus minutus (Hempel), Planococcus citri (Risso), and Pseudococcus cryptus Hempel. Registra-se aqui pela primeira vez L. gloverii , P. nigra , P. aspidistrae , P. trilobitiformis , e P. cryptus sobre citros no estado de Sao Paulo, e M. smilacis sobre plantas hospedeiras de Rutaceae. Parlatoria ziziphi , S . articulatus , and U. citri foram as mais frequentemente observadas sobre as plantas amostradas, e estao entre as especies que atingiram os maiores niveis de infestacao durante o periodo de coleta. Uma revisao com todas as especies associadas a Citrus spp. no Brasil e incluida.
-
Scale Insects (Hemiptera: Coccoidea) on Myrciaria dubia (Myrtaceae) in Brazil
Neotropical Entomology, 2016Co-Authors: Vera R. Dos S. Wolff, Ana Lúcia Benfatti Gonzalez Peronti, T Kondo, A C S NoronhaAbstract:Commercial cultivation of the fruit tree Myrciaria dubia (Myrtaceae) is being developed in Brazil but phytophagous insects, including scale insects (Hemiptera: Coccoidea), can become pests in plantations. The coccids Ceroplastes jamaicensis White, Coccus viridis (Green), Parasaissetia nigra (Nietner), Pseudokermes vitreus (Cockerell) (Coccidae), and the diaspidid Pseudaonidia trilobitiformis (Green) were collected on M. dubia in the municipality of Belém and Tomé-Açu, state of Pará (PA), metropolitan and Northeast Pará mesoregions, Brazil. A key to species of Coccoidea recorded on M. dubia , based on adult females, is provided. Photographs for all scale insects reported on M. dubia are provided. Ceroplastes jamaicensis is recorded for the first time for Brazil and is herein reported for the first time associated with this host.
