Integrating Host Resistance and Plant Protectants to Manage Pythium Root Rot on Geranium and Snapdragon

Múnera, Johanna Del Castillo; Hausbeck, M. K.

doi:10.21273/hortsci.50.9.1319

Cited by 10 publications

(3 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, fungicides showed different abilities among different plants, even among different Pythium spp. (Múnera and Hausbeck, 2015). Based upon environmental temperature, the EC50 value could increase more than 100 times in some fungicides (Matthiesen et al, 2015).…”

Section: Physical and Chemical Controlmentioning

confidence: 99%

Common Strategies to Control <i>Pythium</i> Disease

Ogawa

Ochiai

et al. 2020

RAS

View full text Add to dashboard Cite

Pythium species are soil-borne pathogens which can cause serious economic loss worldwide and threatening agricultural production. Traditional management methods like chemical fungicides are effective against Pythium spp. But as people pay more attention to human health and environmental issues, alternative methods that are ecofriendly and harmless to health are urgently needed. Currently, various approaches had been made including using natural extract, regulating planting conditions, using plant growthpromoting rhizobacteria and screening disease tolerance plants. Hereby, we review the recent achievements, particularly chemical and physical methods, biocontrol and host plant defense which can be used to control Pythium disease.

show abstract

Section: Physical and Chemical Controlmentioning

confidence: 99%

Common Strategies to Control <i>Pythium</i> Disease

Ogawa

Ochiai

et al. 2020

RAS

View full text Add to dashboard Cite

show abstract

“…oopapillum, P. rostratifingens, P. sylvaticum, and P. ultimum isolated from forest nursery crops (Weiland 2014). This potential BCA was as efficient as the commercial standard mefenoxam on P. aphanidermatum, P. irregulare, and P. ultimum affecting geranium and snapdragon in a greenhouse trial (Múnera and Hausbeck 2015). However, under field conditions, reaching reproducible and consistent control of soilborne diseases with BCAs is often limited (Kilany et al 2015;Weiland 2014).…”

mentioning

confidence: 96%

Detection and Quantification of Pythium tracheiphilum in Soil by Multiplex Real-Time qPCR

et al. 2019

View full text Add to dashboard Cite

In Canada, head lettuce (Lactuca sativa capitata) is extensively produced in the muck soils of southwestern Québec. However, yields are increasingly affected by various soilborne pathogens, including Pythium spp., which cause wilt and damping off. In a survey conducted in Québec muck soils in 2010 and 2011, Pythium tracheiphilum Matta was identified as the predominant Pythium sp. in the root of head lettuce showing Pythium stunt symptoms. Therefore, to improve risk assessment and help further understanding of disease epidemiology, a specific and sensitive real-time quantitative polymerase chain reaction (qPCR) assay based on TaqMan-minor groove binder (MGB) technology was developed for P. tracheiphilum. The PCR primers along with a TaqMan-MGB probe were designed from the ribosomal internal transcribed spacer 2 region. A 100-bp product was amplified by PCR from all P. tracheiphilum isolates tested while no PCR product was obtained from 38 other Pythium spp. or from a selection of additional lettuce pathogens tested. In addition to P. tracheiphilum, the assay was multiplexed with an internal control allowing for the individual validation of each PCR. In artificially infested soils, the sensitivity of the qPCR assay was established as 10 oospores/g of dry soil. P. tracheiphilum was not detected in soils in which lettuce has never been grown; however, inoculum ranged from 0 to more than 200,000 oospores/g of dry soil in commercial lettuce fields. Also, disease incidence was positively correlated with inoculum concentration (r = 0.764). The results suggest that inoculum concentration should be considered when making Pythium stunt management decisions. The developed qPCR assay will facilitate reliable detection and quantification of P. tracheiphilum from field soil.

show abstract

“…Commercial poinsettia cultivars have not been systematically evaluated for their response to pythium root rot, nor has the genetic basis of resistance been explored in university research (Trejo et al, 2012). Complete resistance to pythium root rot is unknown in cultivated poinsettia and generally is lacking in other ornamental species (M unera and Hausbeck 2015). Resistance to pythium root rots is partial; i.e., quantitatively expressed, in geranium [Pelargonium •hortorum (Chagnon and Belanger, 1991)], common bean [Phaseolus vulgaris (Lucas and Griffiths, 2004)], soybean [Glycine max (Bates et al, 2008)], and wheat [Triticum aestivum (Higginbotham et al, 2004)].…”

mentioning

confidence: 99%

Evaluation of Poinsettia Cultivars for Resistance to Pythium Root Rot Caused by Pythium aphanidermatum

Lookabaugh

Whipker

Shew

2017

hortte

View full text Add to dashboard Cite

Pythium aphanidermatum is the predominant species causing pythium root rot of commercially grown poinsettia (Euphorbia pulcherrima) in North Carolina. Pythium root rot is primarily managed with strict sanitation practices and preventative fungicide applications. To determine if host resistance could play a role in the integrated management of pythium root rot, information on the susceptibility of commercial poinsettia cultivars is needed. Commercially available poinsettia cultivars were inoculated with P. aphanidermatum 3 weeks after transplant and evaluated for resistance to pythium root rot 2 months later. Thirty-four cultivars were evaluated for resistance in 2014 and 58 cultivars were evaluated in 2015, for a total of 62 cultivars evaluated. Twenty-nine cultivars were evaluated in both years. Most cultivars were susceptible to pythium root rot and none were completely resistant. However, several cultivars demonstrated partial resistance to pythium root rot. Interspecific hybrid cultivars, including Luv U Pink, had a higher level of partial resistance when compared with conventional cultivars. Partial resistance varied across bract color, response time, and plant vigor groupings. Overall, 6 of 13 partially resistant cultivars identified in 2015 had red bracts. These results indicate that growers should be able to choose among several red bract cultivars that have higher-level partial resistance to pythium root rot than others.

show abstract

Integrating Host Resistance and Plant Protectants to Manage Pythium Root Rot on Geranium and Snapdragon

Cited by 10 publications

References 27 publications

Common Strategies to Control <i>Pythium</i> Disease

Common Strategies to Control <i>Pythium</i> Disease

Detection and Quantification of Pythium tracheiphilum in Soil by Multiplex Real-Time qPCR

Evaluation of Poinsettia Cultivars for Resistance to Pythium Root Rot Caused by Pythium aphanidermatum

Contact Info

Product

Resources

About