Download or read book Studies in Host plant Resistance to Russian Wheat Aphid Diuraphis Noxia Kurdjumov written by Jonathan Robinson and published by . This book was released on 1993 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Russian wheat aphid research at CIMMYT Current status and future goals written by Burnett, P.A. and published by CIMMYT. This book was released on 1991 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Virus induced Gene Silencing of Putative Diuraphis Noxia Kurdjumov Resistance Genes in Wheat written by Laura Starkus and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Russian wheat aphid Diuraphis noxia (Kurdjumov) is a serious pest of world cereal grain crops, primarily barley and wheat. A phenotypic characteristic of D. noxia feeding, leaf rolling, creates a leaf pseudo gall which protects aphids, making it difficult to treat infested plants with insecticides or biological control agents. Therefore, the use of D. noxia-resistant crops is a desirable aphid management tactic. Because of the development of virulent D. noxia biotypes, the identification of new sources of barley and wheat resistance is necessary. Virus-induced gene silencing (VIGS) utilizes the plant defense system to silence viruses in inoculated plants. The accumulation of virus RNA in plants triggers the defense system to silence sequences homologous to the introduced virus and sequences of interest from a plant are inserted into the virus and silenced along with the virus. The VIGS method was tested to determine the ability of barley stripe mosaic virus (BSMV) to serve as a VIGS vector in wheat plants containing the Dnx gene for resistance to D. noxia. Dnx leaves with silenced BSMV virus yielded D. noxia populations that were significantly no different from populations produced on healthy Dnx leaves. Thus, BSMV silencing does not interfere with Dnx resistance. Several different methods were examined to determine how best to confine aphids to the silenced leaf, and a modified plastic straw cage was chosen as the optimum cage type. Microarray and gene expression data were analyzed to select two NBS-LRR type disease resistance protein genes - TaAffx. 104814.1.S1_at and TaAffx. 28897.1.S1 - (NBS-LRR1 and NBSLRR2), in order to assess their role in Dnx resistance. NBS-LRR1 and NBSLRR2 were silenced by inoculating leaves of Dnx plants with barley stripe mosaic virus (BSMV) containing sequences of each gene. Controls included Dnx and Dn0 plants inoculated with BSMV and non-BSMV inoculated plants. Aphids were allowed to feed on control and treatment plants to assess aphid population and mean weight of aphids surviving at the end of the experiment. There were no differences among treatments based on aphid population, but there were significant differences the mean weights of aphids reared on several different treatments.

Download or read book Displacement of Russian Wheat Aphid Diuraphis Noxia Kurdjumov Biotype 1 in Colorado by Russian Wheat Aphid Biotypes Virulent to the Wheat Resistance Gene Dn4 written by and published by . This book was released on 2009 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interactions Among Biological Control Cultural Control and Barley Resistance to the Russian Wheat Aphid Diuraphis Noxia Kurdjumov in Colorado Kansas and Nebraska written by Paola Andrea Sotelo-Cardona and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Russian wheat aphid, Diuraphis noxia (Kurdjumov) (Hemiptera: Aphididae) (RWA), is an important pest in the U.S. Western Plains, causing hundreds of millions of dollars of losses to wheat and barley production through reduced yields and insecticide application costs. The objectives of this research were to evaluate the performance of two RWA-resistant barley varieties planted approximately one month earlier than normal in experimental fields at Fort Collins, Colorado; Tribune, Kansas; and Sidney, Nebraska during 2007, 2008, and 2009. The experimental design was a split-plot design with two main plot treatments (early and normal planting dates), and four split plot treatments (barley varieties) that were randomized within each main treatment plot. The varieties included two RWA-barley resistant varieties, Sidney and Stoneham, and the susceptible variety, Otis, under thiamethoxam-protected and unprotected regimes. Sampling of RWA, other cereal aphids, and natural enemy populations was conducted on four dates from mid May through early July. RWA populations collected from early-planted plots (first week of March) were significantly lower than normal-planted plots in 2007-2009 at the Fort Collins, Colorado and Tribune, Kansas sites. In samples collected from early planting date plots, RWA-resistant varieties yielded RWA populations similar to those found on the insecticide-treated susceptible variety at both Fort Collins and Tribune. At the Sidney, Nebraska site, very low RWA populations were present and there were no differences between either planting date or varietal treatments. The combined effect of early planting and RWA-resistant varieties reduced RWA populations at the Fort Collins, Colorado site in all three years. Results were similar at the Tribune, Kansas site in 2007, but differences due to planting date or variety were not observed in 2008 or 2009. The lowest RWA populations occurred at the Sidney, Nebraska site, were independent of planting date and varietal treatments. The RWA-resistant barley varieties had no negative impact on populations of other cereal aphids compared to those found on the susceptible variety, Otis at any of the three research sites. The only treatment effective in reducing other cereal aphids was the insecticide, thiamethoxam. There was also no clear response of populations of other cereal aphids to different planting date. Neither the RWA-resistant barley varieties nor the systemic, short residual action insecticide treatment had adverse affects on the abundance of natural enemies.

Download or read book Response Model for an Introduced Pest written by Sharron Sue Quisenberry and published by . This book was released on 1998 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Influence of Environment on the Expression of Russian Wheat Aphid Diuraphis Noxia Kurdjumov Resistance written by Robert Crowther Lindeque and published by . This book was released on 2008 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Displacement of Russian Wheat Aphid Diuraphis Noxia Kurdjumov Biotype 1 in Colorado by Russian Wheat Aphid Biotypes Virulent to the Wheat Resistance Gene Dn4 written by Scott Curtis Merrill and published by . This book was released on 2009 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biotypic Status of the Russian Wheat Aphid in Ethiopia written by Tesfay Belay Reda and published by LAP Lambert Academic Publishing. This book was released on 2012 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diuraphis noxia is an insect pest on barley and wheat in Ethiopia. Yield losses of barley can reach up to 79%. Control is through use of resistant barley cultivars. Biotypes can render control with resistance uncertain. In this book it was indicated that no biotypic variation exist in RWA clones on barley in Ethiopia. Susceptibility of one resistant wheat line (Dn4) to the Ethiopian RWA clones indicated biotypic differences between American and Ethiopian RWA clones. Anholocyclic life cycle of RWA in Ethiopia, dependence on land races and fact that barley land races show tolerance to RWA support the finding of no biotypic variation in the Ethiopian RWA clones. It was also indicated in the same book that molecular markers like mtDNA, two microsatellite loci and dnaN and ptrpE genes of the bacterial endosymbiont Buchnera did not reveal genetic variation among worldwide collections of RWA. Only a single substitution was found in the pseudogene (ptrpE) in the Turkish populations. Amercian populations did not reveal a different genetic pattern compared to Ethiopian ones. The absence of genetic variation could be due to the recent and fast spread 0f the insect from its origin.

Download or read book Studies on the Integrated Control of the Russian Wheat Aphid Diuraphis Noxia Kurdjumov Hemiptera Aphididae Using Entomopathogenic Fungi Combined with Sublethal Doses of Insecticides written by Nokulunga Prudence Mzimela and published by . This book was released on 2017 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Host Plant Resistance to Russian Wheat Aphid Homoptera Aphididae in Small Grains written by Esau Sama Formusoh and published by . This book was released on 1993 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Diuraphis Noxia Kurdjumov written by T. J. Poprawski and published by . This book was released on 1992 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Overwintering Ecology of the Russian Wheat Aphid Diuraphis Noxia Kurdjumov in Eastern Colorado written by Scott Curtis Merrill and published by . This book was released on 2007 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spatially explicit RWA density models will enable management actions to be focused on locations and times when the risk of economic damage is high. Use of this research for forecasting spatially explicit RWA densities, as well as increasing knowledge on initial and boundary conditions, will facilitate directed scouting, precision agricultural techniques, and within-field management practices for control of RWA. Adoption of these practices and techniques has the potential to reduce pesticide inputs, allow for more judicious use of resistant cultivars (when they become available), increase natural enemy refuges, and reduce pesticide exposure to agricultural workers and consumers.

Download or read book Identification and Characterization of Resistance to the Russian Wheat Aphid in Small grain Cereals written by Jonathan Robinson and published by CIMMYT. This book was released on 1994 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Plant Resistance to Arthropods written by C. Michael Smith and published by Springer Science & Business Media. This book was released on 2006-01-16 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book synthesizes new information about the environmental advantages of plant resistance, transgenic resistance, the molecular bases of resistance, and the use of molecular markers to map resistance genes. Readers are presented in-depth descriptions of techniques to quantify resistance, factors affecting resistance expression, and the deployment of resistance genes. New information about gene-for-gene interactions between resistant plants and arthropod biotypes is discussed along with the recent examples of using arthropod resistant plants in integrated pest management systems.

Download or read book Elucidation of Possible Virulence Factors Present in Russian Wheat Aphid Diuraphis Noxia Biotypes Saliva written by Rosetta Andrews Van Zyl and published by . This book was released on 2007 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Issues in Life Sciences Botany and Plant Biology Research 2012 Edition written by and published by ScholarlyEditions. This book was released on 2013-01-10 with total page 998 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in Life Sciences—Botany and Plant Biology Research: 2012 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Plant Nutrition and Soil Science. The editors have built Issues in Life Sciences—Botany and Plant Biology Research: 2012 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Plant Nutrition and Soil Science in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Life Sciences—Botany and Plant Biology Research: 2012 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.