Uroleucon

About: Uroleucon is a research topic. Over the lifetime, 150 publications have been published within this topic receiving 2266 citations.

Effect of trap color on species composition of alate aphids (Homoptera: Aphididae) caught over watermelon plants

Abstract: The species composition and abundance of alate aphids caught in water traps containing green or yellow tiles were compared. Traps were operated in a watermelon field during the spring and autumn growing seasons of 1992. Aphis spiraecola Patch, a vector of watermelon mosaic virus 2 (WMV-2), accounted for 79% of the aphids caught in the spring and 91% of those caught in the autumn in yellow traps. However, this species accounted for only 6% and 11% of aphids caught in green traps in the spring and autumn, respectively. Uroleucon pseudambrosiae (Olive), also a vector of WMV-2, was the most abundant aphid in green traps in the spring but was absent in the autumn. Aphis gossypii Glover (16% of aphids in green traps) and Aphis craccivora Koch (31%) were more common in the autumn than in the spring and may be important vectors of cucurbit potyviruses at that time.

Newly established and rarely collected aphids (Homoptera: Aphididae) in Florida and the southeastern United States.

Abstract: Several aphid species are reported as newly established in Florida and/or the southeastern United States, including Acyrthosiphon kondoi Shinji, Aphis amaranthi Holman, Brachycaudus helichrysi (Kaltenbach), Coloradoa achilleae Hille Ris Lambers, Hyadaphis coriandri (Das), Hyperomyzus carduellinus (Theobald), Melanaphis sp., Schizaphis rotundiventris (Signoret), Shivaphis celti Das, Takecallis arundicolens (Clarke), and Toxoptera citricida (Kirkaldy). Further establishment records are reported for Trichosiphonaphis polygoni (van der Goot) that was previously reported from a few counties in Florida and Georgia. Recent Florida finds are reported for three native species, including Aphis minima Tissot, Kaltenbachiella ulmifusa (Walsh & Riley), and Uroleucon elephantopicola Robinson. Identification information is provided for newly introduced exotic species.

The genus Uroleucon (Homoptera:Aphididae) in Michigan: key, host records, biological notes, and descriptions of three new species.

Abstract: A key, host plant information, and biological notes are presented for 33 species of Uroleucon collected in Michigan. These comprise three fourths of the eastern North American fauna and include three new species, U. cadens, U. gigantiphagum, and U. olivei. The world-wide aphid genus Uroleucon Mordvilko (formerly Dactynotus Ra finesque) is one of the most conspicuous insect groups feeding on Compositae in North America. Smith and Parr?n (1978) listed 71 species, including 43 native to eastern North America; all but one, U. impatiensicolens (Patch), of the latter are restricted to Compositae. Here, I deal with species occurring in Michigan. Most species reported have ranges much larger than the state of Michigan, and most eastern American species are included. Progress in taxonomy of Uroleucon, as with many other aphid groups, has depended upon attention to host plant associations and upon study of specimens cleared before mounting, a procedure rarely used in America before 1960. In particular, Olive (1963-1967) used both host information and cleared specimens to untangle the identities of species previously lumped under "ambrosiae." The North American fauna includes species assigned to all three major sub genera, Lambersius Olive, Uroleucon Mordvilko, Uromelan Mordvilko, plus the monospecific subgenus Satula Olive. The only other subgenus, Belochilum Boer ner, includes a single Old World species (Eastop and Hille Ris Lambers, 1976). On a world level, the division into Uromelan ("black-tailed") and Uroleucon ("white-tailed") is probably artificial since caudal color, the character used to distinguish the two subgenera, has apparently changed more than once, as evi denced by the fact that European species, both black- and white-tailed, share features (e.g., dark coxae and relatively dark abdominal sclerites) absent in both black- and white-tailed American species. Holman (1974, 1981a, b) discusses the evolution of caudal color, particularly in Old World species, and consequences for the usefulness of the division into Uroleucon and Uromelan. Considering only the American fauna, species with pale caudae and those with dark caudae probably do form just two lineages since differences in other characters correspond with caudal color (see key to subgenera). In caudal pigmentation, U. obscuricaudatum (Olive) is intermediate, but other characteristics suggest that it belongs with Uroleucon (Olive, 1965c). Lambersius is restricted to North America and resembles American Uroleucon more than Uromelan; here, U rudbeckiae (Fitch) is intermediate in that it is red in life, as in Uroleucon, but has the siphunculi paler basally, as in Lambersius.

LOS ÁFIDOS (Hemiptera: Aphididae) EN EL CALLEJÓN DE HUAYLAS - ANCASH, PERÚ APHIDS (Hemiptera: Aphididae) AT THE CALLEJÓN DE HUAYLAS - ANCASH, PERÚ

Abstract: Plant aphids were collected in different crop plants and weeds at the Callejon de Huaylas zone, Ancash, Peru. Micro slides were prepared for species determination, and 31 aphid species corresponding to 4 subfamilies and 5 tribes were identified. 123 aphid-plant relationships were established in 52 plant species from 45 genera and 19 families The following 18 aphid species are registered for the first time in the Callejon de Huaylas: Acyrtosiphon kondoi, Aphis cytisorum, A. fabae, A. helianthi, A. nerii, A. spiraecola, Brachycaudus schwartzi, Capitophorus elaeagni, Hyalopterus pruni, Metopolophium dirhodum, Myzus ornatus, Nasonovia ribisnigri, Rhopalosiphoninus latysiphon, Rhopalosiphum padi, Tuberolachnus salignus, Uroleucon ambriosae, U. sonchi y Wahlgreniella nervata and Aphis helianthi as well as Aphis cytisorum are registered for the first time in Peru. The oligophagous character of Aphis craccivora, A. gossypii, A. fabae, A. spiraecola, Brachycaudus helichrysi, Macrosiphum euphorbiae, Myzus ornatus, M. persicae, Uroleucon ambrosiae was confirmed. Brevicoryne brassicae showed and a wide host range. Aphis cytisorum was confirmed as the aphid affecting the retama plant at the Callejon de Huaylas, together with Aphis craccivora y A. fabae as well as the specificity of A. helianthi for plant species of the Asteraceae family.