| seasonal abundance of aphids (homoptera: aphididae) in wheat and their role as barley yellow dwarf virus vectors in the south carolina coastal plain. | aphid (homoptera: aphididae) seasonal flight activity and abundance in wheat, triticum aestivum l., and the significance of aphid species as vectors of barley yellow dwarf virus were studied over a nine-year period in the south carolina coastal plain. four aphid species colonized wheat in a consistent seasonal pattern. greenbug, schizaphis graminum (rondani), and rice root aphid, rhopalosiphum rufiabdominalis (sasaki), colonized seedlingwheat immediately after crop emergence, with apterous colon ... | 2001 | 11332833 |
| screening and analysis of differentially expressed genes from an alien addition line of wheat thinopyrum intermedium induced by barley yellow dwarf virus infection. | the alien addition line tai-27 contains a pair of chromosomes of thinopyrum intermedium that carry resistance against barley yellow dwarf virus (bydv). a subtractive library was constructed using the leaves of tai-27, which were infected by schizaphis graminum carrying the gav strain of bydv, and the control at the three-leaf stage. nine differentially expressed genes were identified from 100 randomly picked clones and sequenced. two of the nine clones were highly homologous with known genes. of ... | 2004 | 15644969 |
| economic evaluation of the effects of planting date and application rate of imidacloprid for management of cereal aphids and barley yellow dwarf in winter wheat. | the effects of planting date and application rate of imidacloprid for control of schizaphis graminum rondani, rhopalosiphum padi l. (homoptera: aphididae), and barley yellow dwarf virus (bydv) in hard red winter wheat were studied. the first experiment was conducted from 1997 to 1999 at two locations and consisted of three planting dates and four rates of imidacloprid-treated seed. the second experiment was conducted from 2001 to 2002 in stillwater, ok, and consisted of two varieties of hard red ... | 2005 | 15765670 |
| influence of aphid species and barley yellow dwarf virus on soft red winter wheat yield. | yield loss in soft red winter wheat, triticum aestivum l., caused by aphid-transmitted barley yellow dwarf virus (family luteoviridae, genus luteovirus, bydv) was measured over a 2-yr period in central missouri. rhopalosiphum padi (l.) was the most common and economically important species, accounting for > 90% of the total aphids. schizaphis graminum (rondani), rhopalosiphum maidis (fitch), and sitobion avenae (f.) made up the remainder of the aphids. aphid numbers peaked at wheat stem elongati ... | 2005 | 16539127 |
| insect infestations, incidence of viral plant diseases, and yield of winter wheat in relation to planting date in the northern great plains. | planting date effects on arthropod infestation and viral plant disease are undocumented for winter wheat, triticum aestivum l., in south dakota and the northern great plains. winter wheat was planted over three dates (early, middle, and late; generally from late august to late september) to determine the effect on abundance of insect pests, incidence of plant damage, incidence of viral plant disease, and grain yield. the study was conducted simultaneously at two sites in south dakota over three ... | 2005 | 16539128 |
| biometrical genetic analysis of luteovirus transmission in the aphid schizaphis graminum. | the aphid schizaphis graminum is an important vector of the viruses that cause barley yellow dwarf disease. we studied the genetic architecture of virus transmission by crossing a vector and a non-vector genotype of s. graminum. f1 and f2 hybrids were generated, and a modified line-cross biometrical analysis was performed on transmission phenotype of two of the viruses that cause barley yellow dwarf: cereal yellow dwarf virus (cydv)-rpv and barley yellow dwarf virus (bydv)-sgv. our aims were to ... | 2007 | 17021612 |
| cytopathological evidence for the division of barley yellow dwarf virus isolates into two subgroups. | the cytological survey of oat cells in tissue infected with different aphid-specific or aphid-nonspecific isolates of barley yellow dwarf virus (bydv) was concluded in this study with the examination of the alterations induced by schizaphis graminum-specific and s. graminum-nonspecific isolates. cytological alterations were similar with all four isolates examined, except that proliferated membranous inclusions, common with three of the isolates, were absent with s. graminum-nonspecific isolate 6 ... | 1979 | 18627893 |
| genetic regulation of polerovirus and luteovirus transmission in the aphid schizaphis graminum. | abstract sexual forms of two genotypes of the aphid schizaphis graminum, one a vector, the other a nonvector of two viruses that cause barley yellow dwarf disease (barley yellow dwarf virus [bydv]-sgv, luteovirus and cereal yellow dwarf virus-rpv, polerovirus), were mated to generate f1 and f2 populations. segregation of the transmission phenotype for both viruses in the f1 and f2 populations indicated that the transmission phenotype is under genetic control and that the parents are heterozygous ... | 2006 | 18943747 |
| virus transmission phenotype is correlated with host adaptation among genetically diverse populations of the aphid schizaphis graminum. | abstract schizaphis graminum is an important insect pest of several grain crops and an efficient vector of cereal-infecting luteoviruses and poleroviruses. we examined the virus transmission characteristics of several distinct populations and various developmental stages of the aphid. seven well-characterized s. graminum biotypes maintained at the usda-ars laboratory in stillwater, ok, and two biotypes maintained in new york (one collected in wisconsin and the other collected in south carolina) ... | 2002 | 18944022 |
| variation in transmission efficiency among barley yellow dwarf virus-rmv isolates and clones of the normally inefficient aphid vector, rhopalosiphum padi. | the rmv strain of barley yellow dwarf virus (bydv-rmv) is an unassigned member of the luteoviridae that causes barley yellow dwarf in various cereal crops. the virus is most efficiently vectored by the aphid rhopalosiphum maidis, but can also be vectored with varying efficiency by r. padi and schizaphis graminum. field collections of alate aphids migrating into the emerging winter wheat crop in the fall of 1994 in central new york identified a high proportion of r. padi transmitting bydv-rmv. th ... | 2001 | 18944037 |
| transmission of two viruses that cause barley yellow dwarf is controlled by different loci in the aphid, schizaphis graminum. | clonal populations of the aphid, schizaphis graminum, have been separated into biotypes based on host preference and their ability to overcome resistance genes in wheat. recently, several biotypes were found to differ in their ability to transmit one or more of the viruses that cause barley yellow dwarf disease in grain crops, and vector competence was linked to host preference. the genetics of host preference has been studied in s. graminum, but how this may relate to the transmission of plant ... | 2007 | 20302539 |
| species composition of aphid vectors (hemiptera: aphididae) of barley yellow dwarf virus and cereal yellow dwarf virus in alabama and western florida. | yellow dwarf is a major disease problem of wheat, triticum aestivum l., in alabama and is estimated to cause yield loss of 21-42 bu/acre. the disease is caused by a complex of viruses comprising several virus species, including barley yellow dwarf virus-pav and cereal yellow dwarf virus-rpv. several other strains have not yet been classified into a specific species. the viruses are transmitted exclusively by aphids (hemiptera:aphididae). between the 2005 and 2008 winter wheat seasons, aphids wer ... | 2011 | 21882679 |
| integrative proteomics to understand the transmission mechanism of barley yellow dwarf virus-gpv by its insect vector rhopalosiphum padi. | barley yellow dwarf virus-gpv (bydv-gpv) is transmitted by rhopalosiphum padi and schizaphis graminum in a persistent nonpropagative manner. to improve our understanding of its transmission mechanism by aphid vectors, we used two approaches, isobaric tags for relative and absolute quantitation (itraq) and yeast two-hybrid (yth) system, to identify proteins in r. padi that may interact with or direct the spread of bydv-gpv along the circulative transmission pathway. thirty-three differential aphi ... | 2015 | 26161807 |