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Simple Haired Pubescence Of Alfalfa Medicago Sativa Linneaus As A Resistance Mechanism To The Potato Leafhopper Empoasca Fabae Harris
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Book Synopsis Simple-haired Pubescence of Alfalfa (Medicago Sativa Linneaus) as a Resistance Mechanism to the Potato Leafhopper (Empoasca Fabae Harris) by : Brian Gerard Christoffel
Download or read book Simple-haired Pubescence of Alfalfa (Medicago Sativa Linneaus) as a Resistance Mechanism to the Potato Leafhopper (Empoasca Fabae Harris) written by Brian Gerard Christoffel and published by . This book was released on 1986 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Chemical Mechanism for Defense of Glandular-haired Alfalfa, Medicago Sativa L., Against the Potato Leafhopper, Empoasca Fabae (Harris) by : Christopher M. Ranger
Download or read book The Chemical Mechanism for Defense of Glandular-haired Alfalfa, Medicago Sativa L., Against the Potato Leafhopper, Empoasca Fabae (Harris) written by Christopher M. Ranger and published by . This book was released on 2004 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonvolatile and volatile compounds from glandular-haired alfalfa genotype, Medicago sativa cv. 'G98A', were identified and bioassayed for their ability to affect preference behavior of the potato leafhopper, Empoasca fabae (Harris). Two-choice bioassays of nonvolatile trichome compounds determined leafhoppers preferred to settle on crude nonglandular trichome extracts from susceptible M. sativa cv. 'Ranger' over glandular trichome extracts from G98A. A nonpolar solvent, such as ethanol, was most effective in extracting biologically-active compounds. Trichome extracts from G98A also exhibited dose-dependent deterrency, such that an increase in extract concentration corresponded with increased leafhopper avoidance. Mass spectral analysis determined a homologous series of nonvolatile fatty acid amides C n H 2n+1 NO (n = 19-23) were major components of glandular trichome extracts from G98A, but were absent in trichome extracts from Ranger and the less resistant M. sativa cv. 'G98C'. When crude G98A trichome extracts were fractionated and bioassayed, a fraction of intermediate polarity exhibited strong, dose-dependent deterrency. However, by limiting contact with the deterrent fraction to only the leafhoppers stylets, it was determined that contact with nonstylet appendages was necessary for activity. Fatty acid amides were major components of the active fraction, and trace components were C12:0 through C18:0, and C18:1, free fatty acids. Activity slightly declined following removal of the free fatty acids. Purified fatty acid amides continued to deter leafhopper settling, and supplementation with authentic C 12:0-C18:0, and C18:1 free fatty acids resulted in increased activity. But, the free fatty acids alone were not deterrent. Mass spectral studies identified the major series of homologous fatty acid amides from G98A as N -(3-methylbutyl)amides of C14:0 through C18:0 fatty acids, and minor components as a homologous series of N-(methylpropyl)amides of C14:0 through C18:0 fatty acids. N -(3-methylbutyl)amide of linoleic acid (C18:2) was also present in trace amounts, as were C12:0 through C18:0, and C18:1, free fatty acids. A mixture of synthetic N -(3-methylbutyl)amides of C14:0-C18:0 did not exhibit dose-dependent deterrency, nor did a mixture of N -(methylpropyl)amides of C14:0-C18:0. In contrast, when tested singly, N -(3-methylbutyl)amide of linoleic acid (C18:2) exhibited dose-dependent settling deterrency. To assess the role of volatiles in leafhopper resistance, stem, leaf, and whole plant volatiles were collected using vacuum steam distillation and head-space analysis from G98A and Ranger: 1-Octen-3-ol, (Z)-3-hexen-1-ol, and (Z)-3-hexenyl acetate were the most predominant compounds in steam distillates from both plant selections, and (Z)-3-hexenyl acetate was a major component in head-space samples. No volatiles were unique to either G98A or Ranger, but (Z)-3-hexenyl acetate and 1-octen-3-ol were frequently collected in lower amounts from G98A compared to Ranger. In two-choice bioassays, potato leafhoppers oriented towards leaf steam distillates and head-space samples from Ranger over G98A. However, leafhoppers were not attracted to synthetic (Z)-3-hexenyl acetate or 1-octen-3-ol when tested singly against a solvent control.
Book Synopsis Population Studies of the Potato Leafhopper, Empoasca Fabae (Harris), on Alfalfa, Medicago Sativa L. by : Donald Edward Simonet
Download or read book Population Studies of the Potato Leafhopper, Empoasca Fabae (Harris), on Alfalfa, Medicago Sativa L. written by Donald Edward Simonet and published by . This book was released on 1978 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Resistance of Seedling Alfalfas, Medicago Spp., to the Potato Leafhopper, Empoasca Fabae (Harris) by : James Allan Webster
Download or read book Resistance of Seedling Alfalfas, Medicago Spp., to the Potato Leafhopper, Empoasca Fabae (Harris) written by James Allan Webster and published by . This book was released on 1968 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Potato Leafhopper, Empoasca Fabae (Harris), (Homoptera: Cicadellidae) Density on Yield and Quality of Alfalfa, Medicago Sativa L. by : Dhanraj Samaroo
Download or read book The Effects of Potato Leafhopper, Empoasca Fabae (Harris), (Homoptera: Cicadellidae) Density on Yield and Quality of Alfalfa, Medicago Sativa L. written by Dhanraj Samaroo and published by . This book was released on 1994 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Integrated Pest Management for the Potato Leafhopper (Empoasca Fabae) in Alfalfa by :
Download or read book Integrated Pest Management for the Potato Leafhopper (Empoasca Fabae) in Alfalfa written by and published by . This book was released on 2014 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alfalfa, Medicago sativa L., is one of the best quality dairy forages and as the principal forage legume in the U.S., is grown on roughly 10 million ha. Potato leafhopper, Empoasca fabae Harris, is its most economically damaging insect in the Midwest and northeast United States. Integrated pest management (IPM) programs for E. fabae in alfalfa consist of sampling and monitoring throughout the season, foliar insecticide treatments when economic thresholds are reached, host plant resistance and the cultural control of early harvest when economic thresholds are reached within a week of a planned harvest. The work presented here gives a thorough review of E. fabae ecology and biology, migration patterns and injury to host plants. A thorough review of available pest management strategies for E. fabae in alfalfa is discussed (chapter 1). An IPM system incorporating host plant resistance and orchardgrass intercroppings as a cultural control is studied with regards to affects on E. fabae abundance and alfalfa yield and forage quality (chapter 2). Alfalfa yield loss response to E. fabae feeding is assessed in order to validate the current economic injury level and economic threshold models for both susceptible and resistant alfalfa varieties (chapter 3). Lastly, soil fertility treatments are considered as a potential cultural control tactic for managing E. fabae in response to farmer observations (chapter 4).
Book Synopsis Inheritance of Resistance to the Potato Leafhopper in Alfalfa by : Norman Linn Taylor
Download or read book Inheritance of Resistance to the Potato Leafhopper in Alfalfa written by Norman Linn Taylor and published by . This book was released on 1953 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Alfalfa Resistance to the Potato Leafhopper by : Stephen Alan Lefko
Download or read book Alfalfa Resistance to the Potato Leafhopper written by Stephen Alan Lefko and published by . This book was released on 1999 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1997 several seed companies released alfalfa products that were marketed as resistant to the potato leafhopper, (Empoasca fabae Harris), the key pest of this crop in the Midwest and northeastern United States. The objectives of this research were to investigate the mechanism of insect resistance in leafhopper-resistant alfalfa and to determine if potato leafhopper-resistant alfalfa would require updated pest-management guidelines. It was determined that an antixenotic mechanism functioned at a plant or stem level, and without a choice, leafhoppers could feed as much on resistant alfalfa compared with susceptible alfalfa. Antixenosis was largely a function of insect behavior. The antixenotic mechanism detected in lab studies was not detected at the field-plot scale. The densities of potato leafhopper adults and nymphs were similar among plots of one susceptible alfalfa and four leafhopper-resistant alfalfa during three years of sampling.
Book Synopsis Potassium-induced Tolerance to Potato Leafhopper, Empoasca Fabae (Harris) (Homoptera: Cicadellidae), in Alfalfa, Medicago Sativa by : Clara Fuentes Bustamante
Download or read book Potassium-induced Tolerance to Potato Leafhopper, Empoasca Fabae (Harris) (Homoptera: Cicadellidae), in Alfalfa, Medicago Sativa written by Clara Fuentes Bustamante and published by . This book was released on 1998 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Probing Injury by the Potato Leafhopper, Empoasca Fabae (Harris) (Homoptera: Cicadellidae), to Vascular Tissue in Stems of Alfalfa, Medicago Sativa L. by : Carol Lynn Ecale
Download or read book Probing Injury by the Potato Leafhopper, Empoasca Fabae (Harris) (Homoptera: Cicadellidae), to Vascular Tissue in Stems of Alfalfa, Medicago Sativa L. written by Carol Lynn Ecale and published by . This book was released on 1993 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biological Studies on the Potato Leafhopper, Empoasca Fabae (Harris), as an Alfalfa Pest by : Costas Alexander Kouskolekas
Download or read book Biological Studies on the Potato Leafhopper, Empoasca Fabae (Harris), as an Alfalfa Pest written by Costas Alexander Kouskolekas and published by . This book was released on 1964 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantification of Loss in Yield for Alfalfa (Medicago Sativa) Infested by the Potato Leafhopper (Empoasca Fabae) by : Claudia Lee Womack
Download or read book Quantification of Loss in Yield for Alfalfa (Medicago Sativa) Infested by the Potato Leafhopper (Empoasca Fabae) written by Claudia Lee Womack and published by . This book was released on 1982 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanisms by Which Grass Reduces Potato Leafhopper, Empoasca Fabae (Harris) (Homoptera: Cicadellidae), Abundance in Alfalfa by :
Download or read book Mechanisms by Which Grass Reduces Potato Leafhopper, Empoasca Fabae (Harris) (Homoptera: Cicadellidae), Abundance in Alfalfa written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanisms by which Grass Reduces Potato Leafhopper, Empoasca Fabae (Harris) (Homoptera: Cicadellidae), Abundance in Alfalfa by : Lane Martin Smith
Download or read book Mechanisms by which Grass Reduces Potato Leafhopper, Empoasca Fabae (Harris) (Homoptera: Cicadellidae), Abundance in Alfalfa written by Lane Martin Smith and published by . This book was released on 1987 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigating the Nature of Resistance to Potato Leafhopper, Empoasca Fabae (Harris) in Solanum Berthaultii (Hawkes) and Its Hybrids with S. Tuberosum by : Ane Hackbart De Medeiros
Download or read book Investigating the Nature of Resistance to Potato Leafhopper, Empoasca Fabae (Harris) in Solanum Berthaultii (Hawkes) and Its Hybrids with S. Tuberosum written by Ane Hackbart De Medeiros and published by . This book was released on 2002 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Bibliography of the Potato Leafhopper by : G. G. Gyrisco
Download or read book A Bibliography of the Potato Leafhopper written by G. G. Gyrisco and published by . This book was released on 1978 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Feeding Injury to Alfalfa by the Potato Leafhopper, Emopoasca Fabae (Harris). by : Glenn Delton Moore
Download or read book Evaluation of Feeding Injury to Alfalfa by the Potato Leafhopper, Emopoasca Fabae (Harris). written by Glenn Delton Moore and published by . This book was released on 1968 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: