Wilt and root rot of poinsettia caused by three high-temperature-tolerant Pythium species in ebb-and-flow irrigation systems

Miyake, Noriyuki; Nagai, Hirofumi; Kageyama, Koji

doi:10.1007/s10327-014-0542-2

Cited by 16 publications

(12 citation statements)

References 21 publications

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“…This species was reported causing cutting rot in soilless production systems in Brazil (Palmucci and Grijalba 2007). In addition, Miyake et al (2014) reported sudden outbreaks of root rot in ebb-and-flood production of poinsettias in Japan, with P. myriotylum and P. helicoides discovered to be the pathogens. Their subsequent research found that isolates of all three high-temperature-loving Pythium species -P. aphanidermatum, P. myriotylum, and P. helicoidesgave the greatest incidence and severity of root rot at 35 C/95 C when inoculated to poinsettia.…”

Section: Biology and Epidemiologymentioning

confidence: 98%

“…Globisporangium debaryanum), P. irregulare (syn. Globisporangium irregulare), P. perniciosum, and P. ultimum (Farr and Rossman 2015) as well as P. myriotylum and P. helicoides (Miyake et al 2014). Strider and Jones (1985) mention P. ultimum as the primary problem in poinsettia production up until that time, but P. aphanidermatum has caused the most dramatic losses in recent years (Moorman et al 2002).…”

Section: 9mentioning

confidence: 99%

“…Sanitation between crops will be especially important in operations with recirculating irrigation systems, which favor dissemination and infection of Pythium spp. Miyake et al (2014) noted that poinsettias were first seen with root rot caused by P. helicoides in Japan in ebb-and-flow production following rose and begonia crops that were known hosts of that species. Although monitoring for Pythium root rot is usually a matter of watching for symptoms, bentgrass traps have been used to monitor for populations of high-temperature Pythium species in ebb-and-flood systems in Japan.…”

Section: Managementmentioning

confidence: 99%

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Diseases of Poinsettia

Daughtrey¹,

Chase²

2016

Handbook of Plant Disease Management

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Section: Biology and Epidemiologymentioning

confidence: 98%

Section: 9mentioning

confidence: 99%

Section: Managementmentioning

confidence: 99%

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Diseases of Poinsettia

Daughtrey¹,

Chase²

2016

Handbook of Plant Disease Management

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“…Phylogenetic and molecular analyses were then conducted on the aligned sequences using Geneious Prime version 2020.2.4 (Biomatters, Ltd., Auckland, NZ) (Kearse et al, 2012). An unweighted pair group method with arithmetic mean (UPGMA) (Michener and Sokal, 1957) was constructed using the Tamura-Nei model (Tamura and Nei, 1993) with bootstrap analysis performed by resampling the data 1,000 times (Felsenstein, 1985). In addition to the sequences obtained in this study, sequences were included from the National Center for Biotechnology Information (NCBI) database for comparison (Tables 1, 2).…”

Section: Phylogenetic Analysismentioning

confidence: 99%

Pathogenicity and Mefenoxam Sensitivity of Pythium, Globisporangium, and Fusarium Isolates From Coconut Coir and Rockwool in Marijuana (Cannabis sativa L.) Production

McGehee

Raudales

2021

Front. Agron.

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Oomycetes and fungi were recovered from coconut coir and rockwool substrates where marijuana (Cannabis sativa L. cv. Silver and Citron) plants with root rot and wilt symptoms were grown in a commercial growing facility in Connecticut. The objectives of this study were to identify the isolates collected from these substrates, determine the pathogenicity of the isolates on hemp seedlings in vitro and in vivo, and evaluate the pathogens' sensitivity to mefenoxam. Pythium and Globisporangium isolates were identified by sequencing the mitochondrially-encoded cytochrome oxidase genes (COI and COII) and Fusarium sp. with the translation elongation factor (EF-1α) region and internal transcribed spacer region (ITS4 and ITS5) genes. Three isolates were identified as Globisporangium irregulare (formerly Pythium irregulare), 21 isolates were Pythium myriotylum, and one was Fusarium oxysporum. All the isolates tested were pathogenic to hemp plants in vitro and in vivo, with disease incidence between 6.7 and 100%. Inoculated plants were smaller by 32% or more compared with the non-inoculated control. On average, hemp plants infected with Pythium myriotylum produced the lowest biomass and relative greenness values. None of the Pythium and Globisporangium isolates were resistant to mefenoxam—all were sensitive to ≥5 μg·mL−1 mefenoxam. This is the first report of G. irregulare causing root rot on marijuana and hemp plants. The results of this study provide information about the characteristics of pathogens that can be found potentially in soilless substrates in controlled environment agriculture.

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“…Chrysanthemums are an economically important crop; U.S. wholesale totals for potted and cut flowers amounted to $150 million in 2019 (USDA NASS, 2020). Phytopythium helicoides has been reported as a pathogen of several floriculture crops, including dahlia, miniature roses, begonia, and poinsettia (Afandi et al, 2018;Drechsler, 1930;Ishiguro et al, 2014;Miyake et al, 2014;Yang et al, 2013). Additionally, P. helicoides was recovered from a containment pond at a collaborating nursery; isolates were used to demonstrate pathogenicity on chrysanthemum in previous greenhouse trials (J. Beaulieu et al, unpublished data).…”

mentioning

confidence: 99%

Improving Containerized Nursery Crop Sustainability: Effects of Conservation-driven Adaptations in Soilless Substrate and Water Use on Plant Growth and Soil-borne Disease Development

Beaulieu

Belayneh

Lea‐Cox

et al. 2022

horts

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Containerized crop production faces increasing sustainability challenges with both soilless substrate and water use. To facilitate use of sustainable practices, we evaluated plant health impacts of two substrates, bark and wood fiber, which we contrasted with peat, a substrate that is slower to renew; this was overlaid with an analysis of the effects of water-saving–targeted irrigation reductions, compared with typical well-watered conditions. Health impacts were evaluated in two crops, considering both physiological and disease impacts for tomato with and without Phytophthora capsici, and chrysanthemum with and without Phytopythium helicoides. Substrate type was a strong determinant of plant health, wherein crops grown in a HydraFiber-peat mix (“fiber”) performed worse than those in bark and peat, with up to a 50% and 45% reduction in shoot biomass in tomato and chrysanthemum, respectively (P < 0.001). Tomato decline incidence from P. capsici was 3–6 times higher in fiber than other substrates, and fiber was the only substrate where the effect of P. capsici enhanced decline and rot development compared with noninoculated plants (P < 0.05). In bark, reduced irrigation consistently inhibited tomato and chrysanthemum growth and shoot water content (typically P < 0.001). In peat, whereas tomato growth was inhibited under reduced irrigation (P = 0.012–0.013), chrysanthemum growth was often unaffected. Growth in fiber was uniformly poor regardless of irrigation regime for both crops, and an irrigation treatment effect was not typically apparent. Reduced irrigation enhanced pathogen effects in fiber and peat for tomato and fiber and bark for chrysanthemum (P < 0.05). This is perhaps the first study to evaluate HydraFiber interactions with disease and reduced irrigation and suggests that this product consistently incurs costs to crop productivity. However, the peat-replacing bark substrate has strong potential to optimize plant growth physiologically and via disease suppression and can be used under reduced irrigation without compromising economic productivity of the system.

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Wilt and root rot of poinsettia caused by three high-temperature-tolerant Pythium species in ebb-and-flow irrigation systems

Cited by 16 publications

References 21 publications

Diseases of Poinsettia

Diseases of Poinsettia

Pathogenicity and Mefenoxam Sensitivity of Pythium, Globisporangium, and Fusarium Isolates From Coconut Coir and Rockwool in Marijuana (Cannabis sativa L.) Production

Improving Containerized Nursery Crop Sustainability: Effects of Conservation-driven Adaptations in Soilless Substrate and Water Use on Plant Growth and Soil-borne Disease Development

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