The genus Grahocephala, which was described by Van Duzee (1916), is a large complex group distrib... more The genus Grahocephala, which was described by Van Duzee (1916), is a large complex group distributed from southern Canada to Colombia, Venezuela, and French Guiana. Young (1977) revised the genus and described twelve new species. Later, Nielson and Godoy (1995) added five more species. In this paper two new species are described from Costa Rica : G. crusa and G.
This guide is a compilation of limited morphological and biological information on the winged mor... more This guide is a compilation of limited morphological and biological information on the winged morphs of 60 species of aphids that have been collected in Costa Rica. It should not be viewed as a definitive taxonomic treatise on the aphids of Costa Rica, rather it is a tool that can be used to assist in research on the biology, host plant relationships, taxonomy, and virus transmission capabilities of aphids. Each species is covered in an identical manner. Morphological and biological information is provided in both Spanish and English as well as photographs of slide mounted specimens. Keys are provided to help the user in identifying the species. Most of the specimens examined were taken in traps associated with epidemiological studies. Limited field collecting has generated host records and these have been added to a list of the aphids of Central America that was compiled by Pamela Anderson and appended in the guide with her permission. The authors hope that this book will be useful...
... Rica; C. Chacón-Díaz, CIBCM, UCR and Facultad de Microbiología, UCR, San José, Costa Rica; L.... more ... Rica; C. Chacón-Díaz, CIBCM, UCR and Facultad de Microbiología, UCR, San José, Costa Rica; L. Garita and W. Villalobos, CIBCM, UCR ... Positive PCR results (approximately 472-bp band) were obtained from two of the grafted seedlings and seven field trees from two distinct ...
... W. Villalobos, L. Moreira, and C. Rivera, Centro de Investigación en Biologia Celular y Molec... more ... W. Villalobos, L. Moreira, and C. Rivera, Centro de Investigación en Biologia Celular y Molecular, Universidad de Costa Rica, San José ... All seven symptomatic plants (three soybean, three sweet pepper, and one passion fruit) tested, but not healthy controls, yielded positive ...
... W. Villalobos, and L. Moireira, Centro de Investigación en Biología Celular y Molecular (CIBC... more ... W. Villalobos, and L. Moireira, Centro de Investigación en Biología Celular y Molecular (CIBCM), Universidad de Costa Rica (UCR), E. Chavarría, LAICA-DIECA, Costa Rica, BEL Lockhart, Department of Plant Pathology, University of Minnesota, and C. Rivera, CIBCM and ...
The genus Grahocephala, which was described by Van Duzee (1916), is a large complex group distrib... more The genus Grahocephala, which was described by Van Duzee (1916), is a large complex group distributed from southern Canada to Colombia, Venezuela, and French Guiana. Young (1977) revised the genus and described twelve new species. Later, Nielson and Godoy (1995) added five more species. In this paper two new species are described from Costa Rica : G. crusa and G.
This guide is a compilation of limited morphological and biological information on the winged mor... more This guide is a compilation of limited morphological and biological information on the winged morphs of 60 species of aphids that have been collected in Costa Rica. It should not be viewed as a definitive taxonomic treatise on the aphids of Costa Rica, rather it is a tool that can be used to assist in research on the biology, host plant relationships, taxonomy, and virus transmission capabilities of aphids. Each species is covered in an identical manner. Morphological and biological information is provided in both Spanish and English as well as photographs of slide mounted specimens. Keys are provided to help the user in identifying the species. Most of the specimens examined were taken in traps associated with epidemiological studies. Limited field collecting has generated host records and these have been added to a list of the aphids of Central America that was compiled by Pamela Anderson and appended in the guide with her permission. The authors hope that this book will be useful...
... Rica; C. Chacón-Díaz, CIBCM, UCR and Facultad de Microbiología, UCR, San José, Costa Rica; L.... more ... Rica; C. Chacón-Díaz, CIBCM, UCR and Facultad de Microbiología, UCR, San José, Costa Rica; L. Garita and W. Villalobos, CIBCM, UCR ... Positive PCR results (approximately 472-bp band) were obtained from two of the grafted seedlings and seven field trees from two distinct ...
... W. Villalobos, L. Moreira, and C. Rivera, Centro de Investigación en Biologia Celular y Molec... more ... W. Villalobos, L. Moreira, and C. Rivera, Centro de Investigación en Biologia Celular y Molecular, Universidad de Costa Rica, San José ... All seven symptomatic plants (three soybean, three sweet pepper, and one passion fruit) tested, but not healthy controls, yielded positive ...
... W. Villalobos, and L. Moireira, Centro de Investigación en Biología Celular y Molecular (CIBC... more ... W. Villalobos, and L. Moireira, Centro de Investigación en Biología Celular y Molecular (CIBCM), Universidad de Costa Rica (UCR), E. Chavarría, LAICA-DIECA, Costa Rica, BEL Lockhart, Department of Plant Pathology, University of Minnesota, and C. Rivera, CIBCM and ...
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