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Joseph Postman, Gayle Volk, and Herb Aldwinckle

Correlation of plant DNA sequence data with disease resistance data, with the goal of discovering genetic markers for valuable genes, is dependent on the existence of plant populations with known disease resistance. Segregating populations

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Wenjing Guan, Xin Zhao, Richard Hassell, and Judy Thies

Grafting, with selected resistant rootstocks, for the purpose of controlling diseases and pests is an ancient practice widely used in cultivating a variety of woody trees. Some of the well-known examples include controlling tristeza on citrus

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Beiquan Mou, Steven T. Koike, and Lindsey J. du Toit

.1, and 9.1 to 18.5 million viable seeds per ha, respectively ( Koike et al., 2001a ). Such high plant densities create dense crop canopies, prolonged periods of leaf wetness, and high humidity that favor the development of foliar diseases such as downy

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Cristian E. Loyola, John M. Dole, and Rebecca Dunning

production issues for a species. Production issues. The two most important overall production issues were insect and disease management ( Fig. 2 ). Pest management is not only critical for production of high-quality cut flowers, but also the presence of pests

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Cary L. Rivard and Frank J. Louws

Profitable heirloom tomato production is a major challenge in the southeast as a result of weathered soil structure, abiotic stress, and diseases caused by foliar and soilborne plant pathogens. Diseases caused by pathogens such as Fusarium

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Binoy Babu, Gary Knox, Mathews L. Paret, and Francisco M. Ochoa-Corona

ROSE ROSETTE DISEASE Roses are one of the most important ornamental flowering shrubs grown worldwide. In the United States, the total sales of shrub rose’s value was 204 million U.S. dollars in 2014 ( U.S. Department of Agriculture, 2015 ). Among

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Robert L. Wick

Compendium of Brassica Diseases. S. Roger Rimmer, Vernon I. Shattuck, and Lone Buchwaldt (editors). 2007. APS Press., New York. 117 pages, with 191 color and 26 black-and-white illustrations. $59.00, Softcover, ISBN-13978-0-89054-344-3. The

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Donald Krizek, Patricia Millner, Mary Camp, David Clark, Mark Davis, Bryan Butler, John Teasdale, Deborah Fravel, Sara Reynolds, Ruth Mangum, and Ted Currier

Afield study of organic production of tomato (Lycopersiconesculentum Mill.) in high-tunnels was conducted in 2004. `Mountain Fresh' was transplanted 31 Mar.; `Ultra Sweet' and `Sun Leaper' were transplanted on 21 July. The primary objective was to determine the feasibility of obtaining two crops of fresh-market tomatoes by starting plants 4–8 weeks earlier than the average last spring-killing frost, and extending the growing season 4–6 weeks past the average first fall-killing frost. Plants were started at weekly intervals for 4 weeks in both seasons. Data and observations were recorded on the yield of marketable fruits, plant growth and development, and plant health. Other objectives were to evaluate: 1) the benefits of using a selective UV-blocking film on plant growth and development, disease events; and 2) compost amendments on soil improvement and disease control. Major cultural challenges included water management, soil texture/drainage, prevention of chilling injury, plant support, and adequate ventilation. Major disease/pest challenges involved stalk rot caused by Sclerotinia sclerotiorum in the spring, powdery mildew in spring and late summer, Alternaria and Septoria leaf blight in late summer, and aphids, tomato hornworm, corn earworm, and beet army worm also in late summer. In addition, macrofaunal intrusions by fox, mice, and birds occurred sporadically. Poor drainage and stalk rot in the spring necessitated relocating the tunnels to an uninfested site with better drainage. The fall crop yielded high numbers of marketable quality fruits, well beyond the 15 Oct. average killing frost date. The results suggest that with improved management, there is a considerable potential for profitable extended-season production of organic tomatoes in this region.

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John A. Juvik

C ompendium of C orn D iseases . 3rd ed. 1999. Donald G. White (ed.) in cooperation with the NCR-25 Committee on Corn and Sorghum Diseases and the Department of Crop Sciences, University of Illinois at Urbana-Champaign. APS Press, 3340

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Joseph Krystel, Huawei Liu, John Hartung, and Ed Stover

Citrus greening (HLB) has emerged as the most significant disease in citrus ( Citrus sp.) agriculture ( Bové, 2006 ). The disease is associated with the phloem-limited fastidious gram-negative α-proteobacteria, Candidatus Liberibacter species