Showing papers on "Uroleucon published in 2020"
••
TL;DR: A modification of the identification key to the apterous viviparous females of the known Uroleucon species in South America by Nieto Nafría et al. (2019) is presented.
Abstract: Uroleucon (Hemiptera, Aphididae, Macrosiphini) is a highly diverse and widely distributed genus. Most of its species are hosted by plants of the Asteraceae or Campanulaceae, but three species from the southern end of South America have specialized to live on plants of the genus Adesmia (Fabaceae). New morphological and chorological data are provided for U. adesmiae Mier Durante and Ortego and U. naheulhuapense Nieto Nafria von Dohlen, with a description of the alate viviparous female of the latter species. U. australe Nieto Nafria Mier Durante, sp. n. is described from apterous viviparous females, oviparous females and males from four localities in the Chilean regions of Aysen and Magallanes; it is very close to U. nahuelhuapense, both morphologically and genetically. Contrary to what is typical for aphids, the males of U. australe have a greater number of distinguishing characters than are found in viviparous females. A modification of the identification key to the apterous viviparous females of the known Uroleucon species in South America by Nieto Nafria et al. (2019) is presented.
2 citations
••
TL;DR: Nine aphid species (Hemiptera: Aphididae), mainly found in the southeastern part of the country, were determined as new records for Serbia, and all species are of Palearctic distribution and seem to be monoecious.
Abstract: Nine aphid species (Hemiptera: Aphididae), mainly found in the southeastern part of the country, were determined as new records for Serbia. They belong to three subfamilies: Aphis passeriniana (Del Guercio, 1900); A. podagrariae Schrank, 1801; A. salviae Walker, 1852; Brachyunguis tamaricis (Lichtenstein, 1885); Smiela fusca Mordvilko, 1948; Staticobium limonii Contarini, 1847 and Uroleucon pseudobscurum (Hille Ris Lambers, 1967) from the subfamily Aphidinae; Drepanosiphum oregonensis Granovsky, 1939 from the subfamily Drepanosiphinae and Pterocomma jacksoni Theobald, 1921 from the subfamily Pterocommatinae. With the inclusion of these nine records, a total of 383 aphids have been found so far in Serbia. This represents about 70% of the species of the total aphid fauna expected to be found on plants in Serbia. All species are of Palearctic distribution and seem to be monoecious.
2 citations
••
TL;DR: It is concluded that aphidophagous lady beetle oviposition site selection reflects adaptive maternal choices associated with an adequate food resource positively affecting offspring fitness.
Abstract: Maternal effects can result in adaptive phenotypic responses of offspring that increase their fitness. Several recent studies report a positive relationship between maternal choices and offspring fitness. However, few studies have assessed the associations between aphidophagous lady beetle oviposition site selection, the adequacy of food resources for their offspring, and offspring performance. To clarify these issues, we explored whether aphidophagous lady beetle oviposition site selection can influence offspring performance, thereby reflecting adaptive maternal behavior. To assess the effect of food resources on offspring performance, we fed the larvae of 3 lady beetle species: Cycloneda sanguinea (L.), Harmonia axyridis (Pallas), and Hippodamia convergens (Guerin-Meneville) (all Coleoptera: Coccinellidae), with different types of aphids (Uroleucon and Brevicoryne) (both Hemiptera: Aphididae) then measured development time, survival, adult body mass, brightness, and chromatic coloration of the adult beetles. We found that Ha. axyridis larvae fed Brevicoryne exhibited a higher survival rate than those fed Uroleucon. Also more adults emerged from C. sanguinea larvae fed Uroleucon aphids, and these adults were heavier, shinier, with more chroma, and developed faster than those fed on Brevicoryne. Overall, lady beetles performed better when fed aphids commonly found near their respective oviposition sites. We conclude that aphidophagous lady beetle oviposition site selection reflects adaptive maternal choices associated with an adequate food resource positively affecting offspring fitness. Elucidating the links between lady beetle oviposition site choice and optimal resource for their offspring enhances our understanding of habitat use and co-existence of aphidophagous lady beetle communities in Brazilian agroecosystems.
Resumo
Os efeitos maternos podem resultar em respostas fenotipicas adaptativas da prole que aumentam sua aptidao. Varios estudos recentes relatam uma relacao positiva entre escolhas maternas e aptidao dos filhos. No entanto, poucos estudos avaliaram as associacoes entre a selecao do local de oviposicao de besouros afidofagos, a adequacao dos recursos alimentares para a prole e o desempenho da prole. Para esclarecer essas questoes, avaliamos se a selecao do local de oviposicao de besouros afidofagos pode influenciar o desempenho da prole, refletindo assim o comportamento materno adaptativo. Para avaliar o efeito dos recursos alimentares no desempenho da prole, alimentamos as larvas de tres especies de besouros: Cycloneda sanguinea (L.), Harmonia axyridis (Pallas), e Hippodamia convergens (Guerin-Meneville) (todos Coleoptera: Coccinellidae), com diferentes tipos de pulgoes (Uroleucon e Brevicoryne) (ambos Hemiptera: Aphididae), medimos o tempo de desenvolvimento, a sobrevivencia, a massa corporal adulta, o brilho e a coloracao cromatica dos besouros adultos. Foi observado que larvas de Ha. axyridis alimentadas com Brevicoryne exibiram uma taxa de sobrevivencia mais alta do que aquelas alimentadas com Uroleucon. Tambem emergiram mais adultos de larvas de C. sanguinea quando alimentadas com pulgoes Uroleucone e esses adultos eram mais pesados, mais brilhantes, com mais croma e se desenvolveram mais rapidamente do que aqueles alimentados com Brevicoryne. No geral, as joaninhas tiveram melhor desempenho quando alimentados com pulgoes comumente encontrados perto de suas respectivas posturas. Concluimos que a selecao do local de oviposicao de besouros afidofagos reflete escolhas maternas adaptativas associadas a um recurso alimentar adequado que afeta positivamente a aptidao da prole. A elucidacao dos vinculos entre a escolha do local de oviposicao do besouro e o recurso ideal para seus filhotes aprimora nossa compreensao do uso do habitat e a coexistencia de comunidades de besouros afidofagos nos agroecossistemas brasileiros.
Key Words: Cycloneda sanguinea; Harmonia axyridis; Hippodamia convergens; Uroleucon; Brevicoryne; adaptative maternal behavior
View this article in BioOne
2 citations
01 Jan 2020
TL;DR: Significant differences were found between genotypes for Total phenolic content, NPK essential elements, leaf thickness and leaf trichome density, and it was found that the most antixenosis effect was observed on 'Sina', which correlated with increase in Leaf trichomes.
Abstract: The safflower aphid, Uroleucon carthami (Theobald) (Homoptera: Aphididae), is an important pest afflicting safflower in most safflower growing countries in the world. Plant infestation with aphids can reduce plant growth and thus reduce fecundity and crop production. Deliniating the categories of resistance in safflower genotypes under field conditions could be helpful in management of this pest. Antixenosis is defined as a resistance mechanism affecting pest establishment on their host plants. In this research, antixenosis mechanism was evaluated in eight safflower genotypes namely, Padideh, Sina, Zarghan, Sofeh, Goldasht, Golmehr, Esfahan and Varamin at College of Agriculture, Urmia University, during 2016-2017, to identify antixenotic resistance against safflower aphid, U. carthami. Choice tests were conducted at 25 ± 1 oC, 60 ± 5% RH and a photoperiod of 16:8 (L: D) h. After introduction of apterous adult aphids to test arena, the number of aphids on each entry was counted at 2, 4, 6 and 24 hours of release. Significant differences were found between genotypes for Total phenolic content, NPK essential elements, leaf thickness and leaf trichome density. It was found that the most antixenosis effect was observed on 'Sina'. Increase in antixenosis correlated with increase in leaf trichomes. Antixenosis can be important mode of resistance by reducing host selection and delaying aphid colonization. The identification of antixenotic resistance in several genotypes provides additional options for management of this pest. Moreover, the factors associated with this mode of resistance can be effectively used in an integrated pest management of the safflower aphid.
1 citations
••
TL;DR: A new aphid species-Uroleucon (U Roleucon) lebanonense sp.
Abstract: Here we present a description of a new aphid species-Uroleucon (Uroleucon) lebanonense sp. nov. associated with Tragopogon coloratus (Asteraceae) in Lebanon. Apterous and alate viviparous females of the new species are described and illustrated, and compared with the morphologically similar species Uroleucon (U.) mongolicum Holman, 1975. An identification key to Palaearctic Uroleucon species with three setae on the first tarsal segment is provided. On the basis of the re-examination of the type material, we propose to restore the valid species status of U. (U.) altaicum Szelegiewicz, 1982 bona species which was regarded as a synonym of U. mulgedii (Nevsky, 1928). Additionally, we propose transfer of U. (U.) altaicum, U. (U.) bielawskii (Szelegiewicz, 1962) and U. (U.) mulgedii to the subgenus Lambersius Olive.
1 citations
••
TL;DR: Two new aphid species of the genus Uroleucon Mordvilko, 1914 are described, which are associated with the plant genus Grindelia Willd.
Abstract: Here, we present descriptions of two new aphid species of the genus Uroleucon Mordvilko, 1914 (Hemiptera: Aphididae: Macrosiphini), which are associated with the plant genus Grindelia Willd. (Asteraceae). An apterous viviparous female of Uroleucon (Lambersius) robinsoni sp. nov. from Oregon and apterous and alate viviparous females of Uroleucon (Lambersius) grindeliae sp. nov. from Colorado are described and illustrated. Taxonomical notes of the new and other Grindelia-feeding taxa of Uroleucon are given and an updated key to the apterae of the Grindelia-feeding species of Uroleucon in the world is provided.