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Maria L. Burgos-Garay, Chuanxue Hong, and Gary W. Moorman

increases the risk of accumulating and dispersing Pythium species that produce zoospores as well as other plant pathogens. This genus contains some phytopathogenic root pathogens that can cause severe losses in greenhouse crops, particularly those grown in

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Emma C. Lookabaugh, Brian Whipker, and Barbara B. Shew

Pythium root rot is one of the most common diseases of commercially grown poinsettia and P. aphanidermatum is the predominant species causing pythium root rot in North Carolina ( Lookabaugh et al., 2015 ). Under favorable environmental conditions

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Huey-Ling Lin, Jenjira Chumpookam, Ching-Chang Shiesh, and Wen-Hsin Chung

, glasshouses, gardens, fields, and forests ( Agrios, 2005 ) and can be caused by several species of fungi, including Rhizoctonia solani , Pythium spp., Phytophthora spp., Sclerotinia spp., and Fusarium spp. ( Stephens et al., 1982 ). These diseases are

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Charles S. Krasnow and Mary K. Hausbeck

Pythium root rot causes significant losses in ornamental greenhouse production in Michigan, an industry worth an estimated $393 million ( U.S. Department of Agriculture, 2014 ). Pythium species infect roots and root hairs of ornamental plants

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Johanna Del Castillo Múnera and Mary K. Hausbeck

leads the nation in sales for nine floriculture crops, including geranium, with an estimated wholesale value of $375.74 million ( USDA, 2013 ). Pythium spp. infect greenhouse-grown crops and negatively affect the floriculture industry ( Garzón et al

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David R. Bryla, Robert G. Linderman, and Wei Q. Yang

Carolina ( Clayton and Haasis, 1964 ; Milholland and Galletta, 1967 ). Pythium spp. also cause root rot in many plants, including members of the Ericaceae family (which includes blueberry) such as azalea and rhododendron ( Rhododendron spp.; Coyier

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Ramsey Sealy, Michael R. Evans, and Craig Rothrock

Effect of garlic extract on soilborne fungal pathogens in an in vitro nutrient solution system. Isolates of Pythium aphanidermatum , Pythium irregulare , Pythium ultimum , Phytophthora cinnomomi , Phytophthora nicotianae , Rhizoctonia solani , and

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Valérie Gravel, Claudine Ménard, and Martine Dorais

Mandelbaum, 1986 ; Lumsden et al., 1983 ; Zhang et al., 1996 ). Considering that geranium plants are susceptible to root diseases caused by a multitude of pathogens, including numerous Pythium species such as P. splendens ( Griffin, 1972 ), P. ultimum

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Sangho Jeon, Charles S. Krasnow, Gemini D. Bhalsod, Blair R. Harlan, Mary K. Hausbeck, Steven I. Safferman, and Wei Zhang

systems is critical to the floriculture industry. Pythium species and other water molds can be highly destructive to floriculture crops, and spread readily in irrigation water ( Goldberg et al., 1992 ; Hong and Moorman, 2005 ; Lewis Ivey and Miller

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E. Vanessa Campoverde, Georgina Sanahuja, and Aaron J. Palmateer

conditions are highly favorable for disease. Two predominant waterborne pathogens reported during the unusual wet “dry” season were Pythium and Phytophthora . Both are water molds meaning that both are ecologically favored by free water in soil and on