The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Andrew Polaszek - One of the best experts on this subject based on the ideXlab platform.
-
wallaceaphytis an unusual new genus of parasitoid wasp hymenoptera Aphelinidae from borneo
Journal of Natural History, 2014Co-Authors: Andrew Polaszek, Thomas Ayshford, Bakhtiar Effendi Yahya, Lucian FusuAbstract:Wallaceaphytis Polaszek and Fusu gen. nov. (type species Wallaceaphytis kikiae Ayshford and Polaszek sp. nov.) is described from Danum Valley, Sabah, in Malaysian Borneo. Although known from just a single female individual, the genus is extremely unusual morphologically, being the only member of the large subfamily Aphelininae with four-segmented tarsi. The form of the fore wings and head are also unique in the subfamily, and its status as a new genus is confirmed by analysis of nuclear ribosomal DNA. DNA sequence analysis was undertaken by comparison with more than 60 Aphelinid sequences from GenBank. The sequence for the standard DNA barcode region (cytochrome oxidase c subunit I; COI) is provided. The new genus is named in honour of Alfred Russel Wallace, co-discoverer of the theory of evolution by natural selection. The new genus and species are published on the exact date of the centenary of his death.http://www.zoobank.org/urn:lsid:zoobank.org:pub:700D2B2A-1586-4100-85D2-24844EFE3F90
-
encarsia or encarsiella redefining generic limits based on morphological and molecular evidence hymenoptera Aphelinidae
Systematic Entomology, 2007Co-Authors: Stefan Schmidt, Andrew PolaszekAbstract:The genus Encarsiella (syn.n.) (Hymenoptera, Chalcidoidea, Aphelini- dae) is synonymized with Encarsia on the basis of molecular and morphological characters. A phylogenetic analysis was conducted of the D2 expansion region of the 28S ribosomal DNA including thirty-eight Encarsia species. Our phylogenetic analysis revealed a polyphyletic origin of Encarsiella and confirmed the results of earlier analyses indicating the paraphyly of Encarsia. Four species are described as new (Encarsia bifasciata sp.n., E. caelata sp.n., E. obliqua sp.n. and E. pilosa sp.n.). The following species are transferred from Encarsiella to Encarsia: Encarsia aleurodici (Girault, 1916) comb.n., E. amabilis (Huang & Polaszek, 1998) comb.n., E. boswelli (Girault, 1915) comb.n., E. magniclava (Girault, 1915) comb.n., E. narroi Gomez & Garcia comb.n., E. nepalensis (Polaszek & Hayat, 1992) comb.n., E. noyesi (Hayat, 1983) comb.n., E. pithecura (Polaszek, 1999) comb.n., E. tachii (Polaszek & Hayat, 1992) comb.n., E. taiwanensis (Chou & Chou, 1994) comb.n. and E. tamaulipeca (Myartseva & Coronado-Blanco, 2002) comb.n. The generic limits of Encarsia are re-defined based on a re-assessment of morphological characters, and the results are discussed with respect to the current classification of the Aphelinid subfamily Coccophaginae.
-
population dynamics of bemisia tabaci homoptera aleyrodidae parasitoids on cassava mosaic disease resistant and susceptible varieties
Biocontrol Science and Technology, 2006Co-Authors: M Otim, Andrew Polaszek, J P Legg, S Kyamanywa, Dan GerlingAbstract:Abstract Three field trials were conducted at Namulonge Agricultural and Animal Production Research Institute to investigate the population dynamics of Bemisia tabaci Gennadius and its associated Aphelinid parasitoids in Uganda. Results showed that more whitefly occurred on the cassava mosaic disease-resistant variety, (Nase 4) compared to the susceptible variety, (Ebwanatereka). Two species of Aphelinid parasitoids, Eretmocerus mundus Mercet and Encarsia sophia Girault and Dodd, were identified during the study. Overall percent parasitism did not differ significantly (P>0.05) between varieties in all the trials, but significant differences occurred at 13, 15 and 21 weeks after planting during late season (2000), 18 weeks after planting during early season (2001), and 8 weeks after planting during late season (2001). The trends in the build up in numbers of both parasitoids species and apparent parasitism were similar, differed significantly on certain dates. It was, however, noted that percent parasitism...
-
egg parasitism in Aphelinidae hymenoptera chalcidoidea with special reference to centrodora and encarsia species
Bulletin of Entomological Research, 1991Co-Authors: Andrew PolaszekAbstract:Aphelinidae are all insect parasitoids, and most species are associated with nymphal stages of Homoptera: Sternorrhyncha, either as primary parasitoids or hyperparasitoids. The occurrence of egg parasitism in Aphelinids has been recorded in eight of the 38 valid genera and these records are reviewed; it is particularly common in the genus Centrodora , which is shown to be the most polyphagous in the family. One species, C. darwini (Girault), is given special attention because of its occurrence in three recent surveys for biological control agents of crop pests. It is briefly redescribed, diagnosed, and shown to be the most polyphagous Aphelinid known. A checklist of Australian Centrodora spp. is given, including the new combination Centrodora grotiusi (Girault) comb. n . The purported evidence for the classification of certain Encarsia spp. associated with eggs of Lepidoptera as ‘heterotrophic parasitoids’ is re-examined and dismissed.
Uygun N - One of the best experts on this subject based on the ideXlab platform.
-
Parasitoids and hyperparasitoids (Hymenoptera) on aphids (Hemiptera) infesting citrus in east Mediterranean region of Turkey
'Oxford University Press (OUP)', 2014Co-Authors: Satar S., Uygun N, Satar G., Karacao?lu M., Kavallieratos N.g., Stary P., Athanassiou C.g.Abstract:PubMedID: 25480969The aphids, aphid parasitoids, and hyperparasitoids found in citrus orchards, the parasitoids and hyperparasitoids seasonal abundance, and the plant-aphid-parasitoid relationships in Hatay, Osmaniye, Adana, and Mersin provinces of the east Mediterranean region of Turkey are presented in the present 2-yr study. Aphidius colemani Viereck, Binodoxys angelicae (Haliday), and Lysiphlebus confusus Tremblay and Eady (Hymenoptera: Braconidae: Aphidiinae) were encountered as the most common parasitoids among 10 identified aphidiine and Aphelinid taxa on different citrus species. Hyperparasitoids belonging to the genera Alloxysta, Phaenoglyphis, Asaphes, Pachyneuron, Syrphophagus, and Dendrocerus are reported for the first time emerging from aphids feeding on citrus in Turkey. Among them, Asaphes spp., Pachyneuron spp., and Syrphophagus spp. were recorded as the most common ones. Citrus reticulate Blanco and Citrus limon (L.) Burm. fil. were recorded as main hosts for the aphid parasitoids and their hyperparasitoids. © 2014 The Author
-
Present status of citrus whiteflies (Homoptera: Aleyrodidae) in Turkey and their control [Weisse fliegen (Homoptera: Aleyrodidae) an zitrus und deren bekampfung in der Turkei]
1996Co-Authors: Ulusoy R, Uygun N, Kersting U., Satar S.Abstract:Dialeurodes citri (Ashmead) and Parabemisia myricae (Kuwana) have become the most serious citrus pests in Turkey since 1965 and 1982, respectively. In August 1994, two new citrus whiteflies, Aleurothrixus floccosus (Maskell) and Paraleyrodes minei Iaccarino were determined in the East Mediterranean region of Turkey. D. citri and P. myricae thrive best in dense citrus stands with little air movement and high humidity. They are attacked by many indigenous predators, which have, however, only a minor impact on their population dynamics. Studies on biological control of D. citri have been carried by mass culturing and releasing the parasitoid Encarsia lahorensis Howard in the Aegean region of Turkey. Another promising biological control agent, the coccinellid Serangium parcesetosum Sicard, is mass cultured and released in the East Mediterranean region of Turkey. Despite promising results, complete biological control of D. citri by using E. lahorensis and S. parcesetosum has not been achieved yet. D. citri is controlled by cultural methods (wide-space planting, thorough pruning, weed control etc.) and by mineral oil sprays once or twice a year. These measures were not sufficient to suppress P. myricae, but biological control with the Aphelinid wasp Eretmocerus debachi Rose and Rosen has proved to be a complete success. Integrated control measures are presently being developed for A. floccosus and P. minei
-
Interactions between two introduced species of whiteflies in the mediterranean area of Turkey: Dialeurodes citri (Ashmead) and Parabemisia myricae (Kuwana) (Hom., Aleyrodidae)
'Wiley', 1994Co-Authors: Uygun N, Ohnesorge B, Ulusoy R, Şekeroglu E., Gözel U.Abstract:Two introduced species of citrus whiteflies, Dialeurodes citri and Parabemisia myricae met in the east mediterranean area of Turkey and proved to be ecological homologues. P. myricae is the superior competitor on account of its faster development and broader ecological niche and started to replace D. citri. After a most effective parasitoid of P. myricae, the Aphelinid Eretmocerus debachi was released and successfully suppressed this species, D. citri recovered and became dominant even in regions where it had not been present before. In this way the otherwise excellent economic success of the biological control of P. myricae was partly reduced. 1994 Blackwell Verlag Gmb
-
Successful colonization of Eretmocerus debachi (Hym.: Aphelinidae) in the eastern mediterranean citrus region of Turkey
'Springer Science and Business Media LLC', 1993Co-Authors: Sengonca C., Uygun N, Kersting U., Ulusoy RAbstract:The whitefly, Parabemisia myricae (Kuwana) is one of the most serious citrus pests in the Eastern Mediterranean region of Turkey. In 1986, a host-specific parasitoid of P. myricae, the Aphelinid Eretmocerus debachi Rose and Rosen, was imported from California to Turkey and released into citrus orchards along the Eastern Mediterranean coast. In the following years P. myricae-populations were rapidly reduced from about 17 whitefly-immature stages per leaf to less than 0.1 stages per leaf in all citrus orchards where the parasitoids were released. Furthermore, E. debachi was shown to be a good disperser and it is well adapted to the climatic conditions in the Eastern Mediterranean region. Since the successful colonization of E. debachi, the whitefly is no longer a serious pest and it is difficult to find unparasitized individuals in the Eastern Mediterranean region of Turkey. © 1993 Lavoisier Abonnements
M. Mani - One of the best experts on this subject based on the ideXlab platform.
-
Colonization of Introduced Parasitoid, Encarsia guadeloupae Viggiani, on the Exotic Spiralling Whitefly, Aleurodicus dispersus Russell, Infesting Ornamentals
Journal of Horticultural Sciences, 2016Co-Authors: M. Mani, A. KrishnamoorthyAbstract:The exotic spiralling whitefly, Aleurodicus dispersus Russell, was observed to infest several ornamentals including rose, hibiscus, poinsettia and acalypha in and around Bangalore. Efforts were made to colonize the Aphelinid parasitoid, Encarsia guadeloupae Viggiani, during 2002 - 2003 on the above ornamentals infested with the spiralling whitefly. A total of five predators, namely, Axinoscymnus puttarudriahi Kapur and Munshi, Cryptolaemus montrouzieri Muls., Anegleis cardoni (Weise), Mallada astur (Banks) and Cybocephalus sp. were observed on the spiralling whitefly on these ornamentals during the study but their impact on the spiralling whitefly was negligible. Inoculative releases of E. guadeloupae were made on rose (156 adults), hibiscus (179 adults), poinsettia (124 adults) and acalypha (247 adults). Encarsia guadeloupae was recovered within a month after its release with 3.43-32.94% parasitism. A steady decline in the population of spiralling whitefly was observed on these ornamentals. Encarsia guadeloupae was found to be the only parasitoid encountered throughout the study and the total parasitism steadily increased up to 96.00% on rose, 86.40% on hibiscus, 90.40% on poinsettia and 39.86% on acalypha at six months from release. Parasitism by E. guadeloupae was significant and negatively correlated with the population of spiralling whitefly on all the four ornamentals.
-
role of coccophagus sp in the suppression of the soft green scale coccus viridis green hompoptera coccidae on sapota
Biocontrol Science and Technology, 2008Co-Authors: M. Mani, Achyutha Krishnamoorthy, P Ganga N Visalakshy, Ramakrishna VenugopalanAbstract:Abstract The soft green scale Coccus viridis (Green) (Homoptera: Coccidae) has become a major pest of sapota, Manilkara achras (Mill.) Forberg in India. A field study was conducted on the population dynamics of soft green scale Coccus viridis (Green) for 2 years (2004–2006) on sapota at the Indian Institute of Horticultural Research (IIHR) farm, Bangalore, India. The population of green scale declined from 30.72 per leaf in May 2004 to 1.62 per leaf in March 2006. Two coccinellid predators Chilocorus nigrita (Fab.) and Cryptolaemus montrouzieri (Muls.) and one Aphelinid parasitoid Coccophagus sp. were recorded on C. viridis. Both the predators played a minor role in the population fluctuation of C. viridis. The parasitoid Coccophagus sp. was the dominant natural enemy observed throughout the study recording a mean of 10.24–94.67% parasitism. A significant positive correlation of the scale population with minimum temperature (r=0.54) and negative relationship with the parasitism by Coccophagus sp. (r=0.81)...
-
role of the Aphelinid parasitoid encarsia guadeloupae in the suppression of the exotic spiralling whitefly aleurodicus dispersus on banana in india
Biocontrol Science and Technology, 2004Co-Authors: M. Mani, A. Krishnamoorthy, R VenugopalanAbstract:A field study conducted during 2000–2001 on banana plantation located at Bangalore Rural district revealed that the population of the spiralling whitefly Aleurodicus dispersus Russell declined from 116.85 per 25-cm2 leaf area in March 2000 to 1.10 per 25-cm2 leaf area in December 2001. During the study period, a total of seven natural enemies were observed. The Aphelinid parasitoid Encarsia guadeloupae Viggiani was the only major natural enemy encountered on the spiralling whitefly causing 20.70% parasitism in January 2000, which had increased to 95.68% by December 2001. The density of the spiralling whitefly was positively correlated with maximum temperature and negatively correlated with relative humidity and the parasitism by E. guadeloupae. The multiple regression model showed that about 67.94% of the variation in the whitefly density could be accounted for by parasitism only.
Ulusoy R - One of the best experts on this subject based on the ideXlab platform.
-
Present status of citrus whiteflies (Homoptera: Aleyrodidae) in Turkey and their control [Weisse fliegen (Homoptera: Aleyrodidae) an zitrus und deren bekampfung in der Turkei]
1996Co-Authors: Ulusoy R, Uygun N, Kersting U., Satar S.Abstract:Dialeurodes citri (Ashmead) and Parabemisia myricae (Kuwana) have become the most serious citrus pests in Turkey since 1965 and 1982, respectively. In August 1994, two new citrus whiteflies, Aleurothrixus floccosus (Maskell) and Paraleyrodes minei Iaccarino were determined in the East Mediterranean region of Turkey. D. citri and P. myricae thrive best in dense citrus stands with little air movement and high humidity. They are attacked by many indigenous predators, which have, however, only a minor impact on their population dynamics. Studies on biological control of D. citri have been carried by mass culturing and releasing the parasitoid Encarsia lahorensis Howard in the Aegean region of Turkey. Another promising biological control agent, the coccinellid Serangium parcesetosum Sicard, is mass cultured and released in the East Mediterranean region of Turkey. Despite promising results, complete biological control of D. citri by using E. lahorensis and S. parcesetosum has not been achieved yet. D. citri is controlled by cultural methods (wide-space planting, thorough pruning, weed control etc.) and by mineral oil sprays once or twice a year. These measures were not sufficient to suppress P. myricae, but biological control with the Aphelinid wasp Eretmocerus debachi Rose and Rosen has proved to be a complete success. Integrated control measures are presently being developed for A. floccosus and P. minei
-
Interactions between two introduced species of whiteflies in the mediterranean area of Turkey: Dialeurodes citri (Ashmead) and Parabemisia myricae (Kuwana) (Hom., Aleyrodidae)
'Wiley', 1994Co-Authors: Uygun N, Ohnesorge B, Ulusoy R, Şekeroglu E., Gözel U.Abstract:Two introduced species of citrus whiteflies, Dialeurodes citri and Parabemisia myricae met in the east mediterranean area of Turkey and proved to be ecological homologues. P. myricae is the superior competitor on account of its faster development and broader ecological niche and started to replace D. citri. After a most effective parasitoid of P. myricae, the Aphelinid Eretmocerus debachi was released and successfully suppressed this species, D. citri recovered and became dominant even in regions where it had not been present before. In this way the otherwise excellent economic success of the biological control of P. myricae was partly reduced. 1994 Blackwell Verlag Gmb
-
Successful colonization of Eretmocerus debachi (Hym.: Aphelinidae) in the eastern mediterranean citrus region of Turkey
'Springer Science and Business Media LLC', 1993Co-Authors: Sengonca C., Uygun N, Kersting U., Ulusoy RAbstract:The whitefly, Parabemisia myricae (Kuwana) is one of the most serious citrus pests in the Eastern Mediterranean region of Turkey. In 1986, a host-specific parasitoid of P. myricae, the Aphelinid Eretmocerus debachi Rose and Rosen, was imported from California to Turkey and released into citrus orchards along the Eastern Mediterranean coast. In the following years P. myricae-populations were rapidly reduced from about 17 whitefly-immature stages per leaf to less than 0.1 stages per leaf in all citrus orchards where the parasitoids were released. Furthermore, E. debachi was shown to be a good disperser and it is well adapted to the climatic conditions in the Eastern Mediterranean region. Since the successful colonization of E. debachi, the whitefly is no longer a serious pest and it is difficult to find unparasitized individuals in the Eastern Mediterranean region of Turkey. © 1993 Lavoisier Abonnements
A. Krishnamoorthy - One of the best experts on this subject based on the ideXlab platform.
-
Colonization of Introduced Parasitoid, Encarsia guadeloupae Viggiani, on the Exotic Spiralling Whitefly, Aleurodicus dispersus Russell, Infesting Ornamentals
Journal of Horticultural Sciences, 2016Co-Authors: M. Mani, A. KrishnamoorthyAbstract:The exotic spiralling whitefly, Aleurodicus dispersus Russell, was observed to infest several ornamentals including rose, hibiscus, poinsettia and acalypha in and around Bangalore. Efforts were made to colonize the Aphelinid parasitoid, Encarsia guadeloupae Viggiani, during 2002 - 2003 on the above ornamentals infested with the spiralling whitefly. A total of five predators, namely, Axinoscymnus puttarudriahi Kapur and Munshi, Cryptolaemus montrouzieri Muls., Anegleis cardoni (Weise), Mallada astur (Banks) and Cybocephalus sp. were observed on the spiralling whitefly on these ornamentals during the study but their impact on the spiralling whitefly was negligible. Inoculative releases of E. guadeloupae were made on rose (156 adults), hibiscus (179 adults), poinsettia (124 adults) and acalypha (247 adults). Encarsia guadeloupae was recovered within a month after its release with 3.43-32.94% parasitism. A steady decline in the population of spiralling whitefly was observed on these ornamentals. Encarsia guadeloupae was found to be the only parasitoid encountered throughout the study and the total parasitism steadily increased up to 96.00% on rose, 86.40% on hibiscus, 90.40% on poinsettia and 39.86% on acalypha at six months from release. Parasitism by E. guadeloupae was significant and negatively correlated with the population of spiralling whitefly on all the four ornamentals.
-
role of the Aphelinid parasitoid encarsia guadeloupae in the suppression of the exotic spiralling whitefly aleurodicus dispersus on banana in india
Biocontrol Science and Technology, 2004Co-Authors: M. Mani, A. Krishnamoorthy, R VenugopalanAbstract:A field study conducted during 2000–2001 on banana plantation located at Bangalore Rural district revealed that the population of the spiralling whitefly Aleurodicus dispersus Russell declined from 116.85 per 25-cm2 leaf area in March 2000 to 1.10 per 25-cm2 leaf area in December 2001. During the study period, a total of seven natural enemies were observed. The Aphelinid parasitoid Encarsia guadeloupae Viggiani was the only major natural enemy encountered on the spiralling whitefly causing 20.70% parasitism in January 2000, which had increased to 95.68% by December 2001. The density of the spiralling whitefly was positively correlated with maximum temperature and negatively correlated with relative humidity and the parasitism by E. guadeloupae. The multiple regression model showed that about 67.94% of the variation in the whitefly density could be accounted for by parasitism only.