Download or read book The Incidence and Host Parasite Relationships of Selected Nematodes and Forage Grasses written by Theodore Alby and published by . This book was released on 1975 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Plant parasitic and Entomogenous Nematode Research written by and published by . This book was released on 1991 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Incidence and Host Parasite Relationship of Root knot Nematode Meloidogyne Incognita Kofoid and White Chitwood in Horticultural Crops Under Protected Cultivation With CD Copy written by and published by . This book was released on 2015 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Plant Fungal Endosymbionts Alter Host parasite Relationships Between Generalist Herbivores Lepidoptera Noctuidae and an Entomopathogenic Nematode written by Brian Albert Kunkel and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Perennial ryegrass (Lolium perenne L.) and tall fescue (Festuca arundinacea Schreb.) contain symbiotic fungi (Neotyphodium spp.) that provide several ecological advantages to host plants: enhanced resistance to drought, disease, and insect herbivory. The resistance to insect herbivory is the result of fungus-produced alkaloids that are toxic to most herbivores. However, black cutworm, Agrotis ipsilon, is a generalist herbivore that is able to feed and develop on endophytic perennial ryegrass. As some insects can use plant secondary compounds to defend themselves against predators, I hypothesized that the cutworms fed on endophytic grasses would exhibit greater defense against a lethal endoparasitic nematode, Steinernema carpocapsae. To test this hypothesis, I developed a method to remove the fungal endophytes from the grass seed through a heat treatment. Laboratory experiments involving 4-5th instars support the hypothesis that A. ipsilon feeding on plants with high (>90%) incidence of endophyte are less susceptible to entomopathogenic nematodes than those feeding on plants with no or low incidence of endophyte. Field studies show decreased susceptibility to S. carpocapsae when larvae were confined to areas of endophytic grass (>75% infected). Early (2-3rd) instars were equally susceptible to nematode attack regardless of host plant. Endophytic grass fed to cutworm larvae did not influence nematode attachment behavior, or their ability to penetrate and successfully develop into adults. I examined the effects of ergot alkaloids that are produced by N. lolii such as, ergotamine, ergonovine, ergocryptine, ergocristine, and seed extract on nematode viability and infectivity. Ergonovine malate increased and ergocristine decreased the rates of nematode infectivity, whereas other treatments had no significant effect. I investigated the effects of ergocristine on Xenorhabdus nematophila, the symbiotic bacterium of S. carpocapsae. Bacterial growth and pathogenicity were significantly reduced when bacteria were grown in nutrient broth containing 200 g︡/ml concentration of ergocristine. Further research demonstrated that several fungal alkaloids, including ergocristine, persist in or are sequestered by black cutworm and another noctuid, the fall armyworm. I conclude that A. ipsilon developing on endophytic grasses may acquire some level of resistance against entomopathogenic nematodes. This resistance is mediated through the effects of alkaloids; thus our results underscore the ability of N. lolii to affect trophic interactions through the production of alkaloids.

Download or read book The Rasputin Effect When Commensals and Symbionts Become Parasitic written by Christon J. Hurst and published by Springer. This book was released on 2016-07-05 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume focuses on those instances when benign and even beneficial relationships between microbes and their hosts opportunistically change and become detrimental toward the host. It examines the triggering events which can factor into these changes, such as reduction in the host’s capacity for mounting an effective defensive response due to nutritional deprivation, coinfections and seemingly subtle environmental influences like the amounts of sunlight, temperature, and either water or air quality. The effects of environmental changes can be compounded when they necessitate a physical relocation of species, in turn changing the probability of encounter between microbe and host. The change also can result when pathogens, including virus species, either have modified the opportunist or attacked the host’s protective natural microflora. The authors discuss these opportunistic interactions and assess their outcomes in both aquatic as well as terrestrial ecosystems, highlighting the impact on plant, invertebrate and vertebrate hosts.

Download or read book The Biology and Host parasite Relationships of a Neoaplectanid Nematode Parasitic on Some Forest Insect Pests written by Donald Charles Schmiege and published by . This book was released on 1962 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Arboriculture Urban Forestry written by and published by . This book was released on 2006 with total page 830 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Plant Parasitic Nematodes in Subtropical and Tropical Agriculture written by Michel Luc and published by Cabi. This book was released on 2005 with total page 871 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains 22 chapters, 2 appendices (of the nematicides and species mentioned throughout the book) and 24 colour plates covering all aspects of practical plant nematology in subtropical and tropical agriculture, including rice, cereals, sweet potatoes, root and tuber crops, food legumes, vegetables, groundnut, citrus, tree and fruit crops, coconut and other palms, coffee, cocoa, tea, bananas, sugarcane, tobacco, pineapple, cotton, other tropical fibres, spices and medicinal plants. It provides practical guidance on the methods of extracting, processing and diagnosing different plant and soil nematodes and on integrated nematode management. This book is intended for those studying and working in the area of crop protection.

Download or read book Report written by Oklahoma Agricultural Experiment Station and published by . This book was released on 1975 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pesticides Documentation Bulletin written by and published by . This book was released on 1968 with total page 910 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Agriculture with Subject Index written by and published by . This book was released on 1987-10 with total page 1238 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annual Report written by Oklahoma Agricultural Experiment Station and published by . This book was released on 1975 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Agriculture written by and published by . This book was released on 1976 with total page 1732 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Animal Health and Welfare in Organic Agriculture written by Mette Vaarst and published by CABI. This book was released on 2004 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation. The rapid growth of organic farming has been among the most remarkable changes in global agriculture in recent decades. However, more attention was initially aid to the crop side of organic systems, and animals are a lower priority in formal research and the development of organic farming. But now, that has changed. There is now greater recognition of the need to understand animal health and welfare better. The purpose of this book is to further the understanding of organic animal husbandry and to demonstrate practical solutions and innovative methods, drawing mainly on research and practical experience with organic farming in Europe.

Download or read book Agricultural Research Centres written by Cartermill International Limited and published by . This book was released on 1995 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1973 with total page 1244 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts written by and published by . This book was released on 1960 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: