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Christer Hansson - One of the best experts on this subject based on the ideXlab platform.
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uncovering cryptic parasitoid diversity in horismenus chalcidoidea Eulophidae
PLOS ONE, 2015Co-Authors: Sarah G Kenyon, Christer Hansson, Sven Buerki, Nadir Alvarez, Betty BenreyAbstract:Horismenus parasitoids are an abundant and understudied group of Eulophid wasps found mainly in the New World. Recent surveys based on morphological analyses in Costa Rica have quadrupled the number of named taxa, with more than 400 species described so far. This recent revision suggests that there is still a vast number of unknown species to be identified. As Horismenus wasps have been widely described as parasitoids of insect pests associated with crop plants, it is of high importance to properly establish the extant diversity of the genus, in order to provide biological control practitioners with an exhaustive catalog of putative control agents. In this study, we first collected Horismenus wasps from wild Phaseolus bean seeds in Central Mexico and Arizona to assess the genetic relatedness of three morphologically distinct species with overlapping host and geographical ranges. Sequence data from two nuclear and two mitochondrial gene regions uncovered three cryptic species within each of the three focal species (i.e., H. missouriensis, H. depressus and H. butcheri). The monophyly of each cryptic group is statistically supported (except in two of them represented by one single tip in which monophyly cannot be tested). The phylogenetic reconstruction is discussed with respect to differences between gene regions as well as likely reasons for the differences in variability between species.
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the diversity and identification of Eulophid parasitic wasps hymenoptera chalcidoidea Eulophidae on phyllocnistis labyrinthella lepidoptera gracillariidae from vasterbotten sweden
Entomologisk tidskrift, 2012Co-Authors: Benedicte R Albrectsen, Christer HanssonAbstract:Caterpillars of the mining micro-moth Phyllocnistis labyrinthella feed on leaves of aspen (Populus tremula) and are often parasitized by Eulophid wasps. The parasitoids are a potential important cause of death for the miners. During 2009-2011 we collected mined leaves from an experimental stand of aspen trees in Vasterbotten. Adults emerged from 17-35 percent of the mines and of these every second to third specimen appeared as wasps. These wasps represented seven species of Eulophid parasitoids of which three were new to Vasterbotten: Chrysocharis nitetis (Walker), Cirrospilus diallus (Walker) and Cirrospilus pictus (Nees). We include an identification key that may be used to identify these Eulophid species.
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the first record of conopid flies diptera conopidae and Eulophid wasps hymenoptera Eulophidae as parasitoids and hyperparasitoids associated with carpenter bees apidae xylocopinae in argentina
Journal of Apicultural Research, 2010Co-Authors: Mariano Lucia, Christer Hansson, Daniel Alejandro Aquino, Alberto H AbrahamovichAbstract:This is the first record for the parasitoid association between Eulophids and conopids in the carpenter bee Xylocopa augusti Lepeletier. Biological features of Physocephala Schiner are mentioned. A diagnosis for Pediobius williamsoni (Girault) is given and morphological characters are illustrated.
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Two new Eulophid parasitoids (Hymenoptera: Chalcidoidea: Eulophidae) of Liriomyza Trifolii (Burgess) (Diptera: Agromyzidae)
Oriental Insects, 1996Co-Authors: Christer Hansson, John LasalleAbstract:Abstract Cirrospilus ambiguus and Quadrastichus liriomyzae (Hymenoptera: Eulophidae) are newly described, both reared from Liriomyza trifolii in Taiwan C. ambiguus is known from Taiwan, India, Tanzania and South Africa, and Q. liriomyzae from Taiwan. These species are potential biological control agents against L. trifolii.
Phyllis G. Weintraub - One of the best experts on this subject based on the ideXlab platform.
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effects of cyromazine and abamectin on the pea leafminer liriomyza huidobrensis diptera agromyzidae and its parasitoid diglyphus isaea hymenoptera Eulophidae in potatoes
Crop Protection, 2001Co-Authors: Phyllis G. WeintraubAbstract:Abstract The pea leafminer, Liriomyza huidobrensis (Blanchard), arrived in Israel almost a decade ago. Although adults are resistant to insecticides, growers treat fields with translaminar insecticides (abamectin and cyromazine) after they see large numbers of adults. Field trials were conducted for 2 years in potatoes (Solanum tuberosum L.) to evaluate the effects of a single, properly timed, application of these two insecticides on L. huidobrensis and its Eulophid parasitoid, Diglyphus isaea Walker. Abamectin and cyromazine were applied at recommended field rates once, early in the growing season. Yellow sticky traps were used to monitor adult population levels, and leaf samples were used to monitor larval population levels. Cyromazine residues were monitored within the potato plants by a gas chromatograph–mass spectrometer. Both insecticides significantly reduced leafminers as compared to non-treated control; however, cyromazine was significantly more effective than abamectin. Similarly, parasitoid populations from both insecticide treatments were significantly reduced as compared to the non-treated control; however, parasitoid populations from abamectin treated plots recovered sooner than in cyromazine treated plots. Cyromazine residues in the plant declined over time, with a half-life of ≈1 wk. Implications of these results on management practices are discussed.
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Effects of cyromazine and abamectin on the leafminer, Liriomyza huidobrensis and its parasitoid, Diglyphus isaea in celery
Annals of Applied Biology, 1999Co-Authors: Phyllis G. WeintraubAbstract:SUMMARY Field trials were conducted for 2 yr on celery (Apium graveolens L.) to determine the effects of two translaminar insecticides (abamectin and cyromazine) on the agromyzid leafminer, Liriomyza huidobrensis (Blanchard), and the Eulophid parasitoid, Diglyphus isaea Walker. Abamectin and cyromazine were applied once early in the growing season by spray or drip application. Yellow sticky traps and leaf samples were used to monitor population levels; a gas chromatograph-mass spectrometer was used to monitor cyromazine residues within the celery plants during 1 yr. Spray applications of abamectin and cyromazine significantly reduced larval leafminers and D. isaea. Contrary to grower practices, application of cyromazine by drip irrigation systems had minor effects on larval leafminer and D. isaea as compared to spray application. Cyromazine residues in the plants treated by spray application declined sharply after 1 wk, and no residues were detected 2 wk after application; less than 0.05 ppm cyromazine residues were detected in plants treated by drip application. Implications of these results on management practices are discussed.
H C J Godfray - One of the best experts on this subject based on the ideXlab platform.
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phylogeny of Eulophidae hymenoptera chalcidoidea with a reclassification of eulophinae and the recognition that elasmidae are derived Eulophids
Systematic Entomology, 2000Co-Authors: N Gauthier, J Lasalle, Donald L J Quicke, H C J GodfrayAbstract:Summary Eulophidae is a large and biologically varied family of parasitoid wasps, traditionally split into four subfamilies; Elasmidae is a uniform (single genus) and morphologically distinct family of wasps that are thought to be related to Eulophidae. The D2 region of the 28S rDNA gene (≈ 560 bp) of eighty-seven species of Eulophid, three species of elasmid and sixteen outgroup species in five families was sequenced. Cladograms were constructed, and the results compared with conclusions drawn from morphological studies. The gene was most informative at the level of subfamily and tribe. The monophyly of both Eulophinae and Tetrastichinae is supported; that of Entedoninae and Euderinae is less clear. Results indicate that Eulophinae is a derived group within Eulophidae, rather than an ancestral group as previously thought, and that Elasmus, the sole genus of Elasmidae, belongs within this subfamily. The tribes of Eulophinae are reassessed and only three accepted: Eulophini (including Euplectrini and Elachertini), Elasmini and Cirrospilini LaSalle trib.n. for Boucek's Ophelimini with Ophelimus and Australsecodes excluded. Three small Australian tribes, Anselmellini, Ophelimini and Platytetracampini, are removed from Eulophinae and Entedoninae, respectively, but their exact relationships and subfamily status cannot as yet be decided. Another tribe, Keryini, known from a single Australian genus, is excluded from both Eulophinae and Eulophidae.
R C Bhagat - One of the best experts on this subject based on the ideXlab platform.
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Natural Parasitism of Leaf Miner, Chromatomyia horticola (Goureau) (Diptera: Agromyzidae) on Vegetable Crops in Kashmir (India)
2014Co-Authors: Deen Mohammad Bhat, R C Bhagat, Hazratbal Srinagar JAbstract:Abstract: The present paper reports the occurrence of 7 hymenopteran parasitoids of Agromyzid leaf miner, Chromatomyia horticola (Gourear) (Diptera: Agromyzidae) from Kashmir (India). This is being the first report from this region. The various parasitoids recorded were 5 Eulophids (Chrysocharis horticola Mani, Diglyphus horticola Khan, Diglyphus sp., Pediobius indicus Khan and Euderus agromyzae) and 2 braconids (Opius sp. and Dacnusa sp.). Dacnusa sp. is also a new parasitoid record of C. horticola for India. Some field observation have been made on the seasonal occurrence, distribution and percentage of parasitoids of C. horticola recorded in various vegetable crop fields in different areas and regions of Kashmir
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natural parasitism of leaf miner chromatomyia horticola goureau diptera agromyzidae on vegetable crops in kashmir india
World Journal of Agricultural Sciences, 2009Co-Authors: Deen Mohammad Bhat, R C BhagatAbstract:The present paper reports the occurrence of 7 hymenopteran parasitoids of Agromyzid leaf miner, Chromatomyia horticola (Goureau) (Diptera: Agromyzidae) for the first time from Kashmir (India). The various parasitoids recorded are 5 Eulophids (Chrysocharis horticola Mani, Diglyphus horticola Khan, Diglyphus Sp., Pediobius indicus Khan and Euderus agromyzae) and 2 braconids (Opius Sp. and Dacnusa Sp.). Dacnusa Sp. is also a new parasitoid record of C. horticola for India. Some field observation have been made on the seasonal occurrence, distribution and percentage of parasitoids of C. horticola recorded in various vegetable crop fields in different areas and regions of Kashmir.
Betty Benrey - One of the best experts on this subject based on the ideXlab platform.
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uncovering cryptic parasitoid diversity in horismenus chalcidoidea Eulophidae
PLOS ONE, 2015Co-Authors: Sarah G Kenyon, Christer Hansson, Sven Buerki, Nadir Alvarez, Betty BenreyAbstract:Horismenus parasitoids are an abundant and understudied group of Eulophid wasps found mainly in the New World. Recent surveys based on morphological analyses in Costa Rica have quadrupled the number of named taxa, with more than 400 species described so far. This recent revision suggests that there is still a vast number of unknown species to be identified. As Horismenus wasps have been widely described as parasitoids of insect pests associated with crop plants, it is of high importance to properly establish the extant diversity of the genus, in order to provide biological control practitioners with an exhaustive catalog of putative control agents. In this study, we first collected Horismenus wasps from wild Phaseolus bean seeds in Central Mexico and Arizona to assess the genetic relatedness of three morphologically distinct species with overlapping host and geographical ranges. Sequence data from two nuclear and two mitochondrial gene regions uncovered three cryptic species within each of the three focal species (i.e., H. missouriensis, H. depressus and H. butcheri). The monophyly of each cryptic group is statistically supported (except in two of them represented by one single tip in which monophyly cannot be tested). The phylogenetic reconstruction is discussed with respect to differences between gene regions as well as likely reasons for the differences in variability between species.
