Evaluation of Annual Bedding Plants for Resistance to White Mold

Grabowski, Michelle; Malvick, Dean K.

doi:10.21273/hortsci.50.2.259

Cited by 4 publications

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References 20 publications

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“…Three isolates of S. sclerotiorum were used in the experiment: ORN010, isolated from a petunia plant in Chaska, MN; FC002, isolated from a soybean plant in Renville County, MN; and VEG001, isolated from green bean in Spring Valley, WI. Sclerotia of each isolate were produced and stored as described in Grabowski and Malvick (2015).…”

Section: Methodsmentioning

confidence: 99%

“…Plots were inoculated with a mixture of equal quantities of sorghum seed colonized by three isolates of S. sclerotiorum, which was prepared as described by Grabowski and Malvick (2015). The inoculum mixture was spread evenly over the plant canopy at 86.5 L · ha -1 when the trial plants had grown together to achieve canopy closure and again one week later.…”

Section: Methodsmentioning

confidence: 99%

“…White mold, caused by the necrotrophic fungal pathogen Sclerotinia sclerotiorum, causes stem rot, crown rot, wilt, and death of many common annual bedding plants, including zinnia, petunia, verbena, snap dragon, and salvia (Boland and Hall, 1994;Farr and Rossman, 2017;Grabowski and Malvick, 2015). Infested flower beds often suffer significant plant loss each year in part due to the ability of the pathogen to survive for at least 8 years in soil (Bolton et al, 2006).…”

mentioning

confidence: 99%

“…Gleason et al (2009) list over 30 genera of herbaceous perennials and Daughtrey et al (1995) list 10 common flowering potted plants that are susceptible to S. sclerotiorum. New susceptible host plants are regularly identified (Chang et al, 1997;Garibaldi et al, 2008aGaribaldi et al, , 2008bGaribaldi et al, , 2008cGaribaldi et al, , 2001Grabowski and Malvick, 2015;Gulya et al, 2006;Strauss and Dillard, 2009). Grabowski and Malvick (2015) tested four genera of annual bedding plants with no reported susceptibility to white mold for potential resistance to S. sclerotiorum.…”

mentioning

confidence: 99%

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Evaluation of Ornamental Tropical Plants for Resistance to White Mold Caused by Sclerotinia sclerotiorum

Grabowski

Malvick

2017

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Sclerotinia sclerotiorum (Lib.) de Bary is a fungal pathogen that causes stem rot, crown rot, wilt, and death of many common annual flowering plants. Infested flower beds often suffer significant plant loss each year, and the identification of disease resistant plants would be a useful management tool. Caladium (Caladium ×hortulanum Birdsey), canna (Canna ×generalis L.H. Bailey), and elephant ear [Colocasia esculenta (L.) Schott] were evaluated for potential resistance to S. sclerotiorum. Plants grown in field conditions in Minnesota in 2012 and 2013 were inoculated through the application of sorghum grains colonized by S. sclerotiorum. The number of plants infected and percent of canopy dieback were recorded weekly for 3 months. The susceptibility of leaves, flowers, and below ground storage organs was also examined through direct inoculation of plant tissue with a mycelial plug of the pathogen in controlled environmental conditions favorable for disease development. Symptoms and progression of the infection were recorded after 24 days. Symptoms of infection on all three species were similar in field and controlled environments. Caladium plants were susceptible to S. sclerotiorum. Petioles, leaves, and corms developed a watery soft rot. Elephant ear was highly resistant to infection. Sclerotinia sclerotiorum infected only wounded or senescent tissue and did not result in significant symptoms under any conditions. Canna had partial resistance to the pathogen. Although canna petals were readily infected, infection of petioles was restricted to small necrotic lesions. Neither infection progressed to the main stem or resulted in plant death. This study indicates that canna and elephant ear have resistance to S. sclerotiorum and could be used in an integrated disease management program for infested landscape beds.