Survival of south african strains of biovar 2 and biovar 3 ofPseudomonas solanacearum in the roots and stems of weeds

Swanepoel, Anita E.

doi:10.1007/bf02357714

Cited by 13 publications

(3 citation statements)

References 6 publications

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“…At a small-scale level, an intermix of factors such alternate hosts, contaminated soil, water irrigation, and stream runoff, favor short distance dispersal. The observation of S. lycopersicum and P. vulgaris infections in water irrigation and rhizospheres indicates these are potential reservoirs for phylotype IIB-1 survival, as reported in the literature ( Hayward, 1991 ; Swanepoel, 1992 ; Janse et al, 2004 ; Álvarez et al, 2010 ).…”

Section: Discussionsupporting

confidence: 62%

Molecular Epidemiology of Bacterial Wilt in the Madagascar Highlands Caused by Andean (Phylotype IIB-1) and African (Phylotype III) Brown Rot Strains of the Ralstonia solanacearum Species Complex

et al. 2018

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The Ralstonia solanacearum species complex (RSSC) is a highly diverse cluster of bacterial strains found worldwide, many of which are destructive and cause bacterial wilt (BW) in a wide range of host plants. In 2009, potato production in Madagascar was dramatically affected by several BW epidemics. Controlling this disease is critical for Malagasy potato producers. The first important step toward control is the characterization of strains and their putative origins. The genetic diversity and population structure of the RSSC were investigated in the major potato production areas of the Highlands. A large collection of strains (n = 1224) was assigned to RSSC phylotypes based on multiplex polymerase chain reaction (PCR). Phylotypes I and III have been present in Madagascar for a long time but rarely associated with major potato BW outbreaks. The marked increase of BW prevalence was found associated with phylotype IIB sequevar 1 (IIB-1) strains (n = 879). This is the first report of phylotype IIB-1 strains in Madagascar. In addition to reference strains, epidemic IIB-1 strains (n = 255) were genotyped using the existing MultiLocus Variable-Number Tandem Repeat Analysis (MLVA) scheme RS2-MLVA9, producing 31 haplotypes separated into two related clonal complexes (CCs). One major CC included most of the worldwide haplotypes distributed across wide areas. A regional-scale investigation suggested that phylotype IIB-1 strains were introduced and massively spread via latently infected potato seed tubers. Additionally, the genetic structure of phylotype IIB-1 likely resulted from a bottleneck/founder effect. The population structure of phylotype III, described here for the first time in Madagascar, exhibited a different pattern. Phylotype III strains (n = 217) were genotyped using the highly discriminatory MLVA scheme RS3-MLVA16. High genetic diversity was uncovered, with 117 haplotypes grouped into 11 CCs. Malagasy phylotype III strains were highly differentiated from continental African strains, suggesting no recent migration from the continent. Overall, population structure of phylotype III involves individual small CCs that correlate to restricted geographic areas in Madagascar. The evidence suggests, if at all, that African phylotype III strains are not efficiently transmitted through latently infected potato seed tubers.

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Section: Discussionsupporting

confidence: 62%

Molecular Epidemiology of Bacterial Wilt in the Madagascar Highlands Caused by Andean (Phylotype IIB-1) and African (Phylotype III) Brown Rot Strains of the Ralstonia solanacearum Species Complex

et al. 2018

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“…Amaranthus spinosus, Physalis minima and Euphorbia hirta had the highest incidence of Ralstonia solanacearum infection when weeds were tested from a commercial tomato field (Dittapongpitch and Surat 2003).These discoveries suggest that this weed may play a major role in survival of R. solanacearum between successive crops and cropping patterns. The South African biovar strain 3 of Pseudomonas solanacearum, which causes wilt in potatoes, was isolated from D. stramonium and Solanum nigrum (Swanepoel 1992). From the epidemiological perspective, management of weed control within the crop and also plants surrounding the upwind edge of the field will reduce the incidence of diseases associated with the weed (Ormeno et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Effect of Different Weed Management Strategies on Disease Severity and Marketable Yield of Paprika (Capsicum Annuum L.) in the Smallholder Farming Sector of Zimbabwe

Handiseni¹,

Sibiya²,

Ogunlela³

et al. 2008

Journal of Plant Protection Research

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On-farm trials were conducted in the Chinyika Resettlement Area of Zimbabwe under dryland conditions to investigate the effects of different weed management methods on disease incidence, severity and paprika (Capsicum annuum) pod yield. The weed control treatments included hand weeding at 2 and 6 weeks after transplanting (WAT); ridge re-moulding at 3,6 and 9 WAT; application 4 l/ha Lasso (alachlor) immediately after transplanting, and Ronstar (oxidiazinon) at 2 l/ha tank mixed with Lasso at 2 l/ha one day before transplanting. The herbicide-water solution was applied at the rate of 200 l/ha using a knapsack sprayer. Major diseases identified were bacterial leaf spot (Xanthomonas campestris pv. vesicatoria), cercospora leaf spot (Cercospora unamunoi), grey leaf spot (Stemphylium solani) and powdery mildew (Leveillula taurica) in both seasons. For the 2000/2001 season hand weeding at 2 and 6 WAT and ridge re-moulding at 3, 6 and 9 WAT had the greatest reduction effect on the area under disease progress curve (AUDPC) and the highest marketable fruit yield.

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“…균에 감염되면 땅콩 수량 감소 및 품질 저하에 영향을 미친다 (Porter 등, 1982;Thiessen과 Woodward, 2012) (Rajeswari, 2015;Wilson, 1953). 그 중 풋마름병은 아 열대, 온대 기후조건에서 주로 발생하며 가지과 작물을 비롯하 여 여러 작물에 감염하여 심각한 피해를 준다고 알려져 있다 (Hayward, 1991;Swanepoel, 1992)…”

Section: 땅콩은 꼬투리가 땅속에서 자라기 때문에 재배 시 토양병원unclassified

First Report of Bacterial Wilt by Ralstonia pseudosolanacearum on Peanut in Korea

Chioi¹,

Kim²,

Kim³

et al. 2022

Res. Plant Dis

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A peanut plant showing wilt and browned symptom was found in the field of Gochang, Korea, in July 2021. The symptomatic peanut plant was collected from the field and isolation of the pathogen caused the wilt symptom was performed using the collected sample on TZC media. The dominated colony on media was isolated colony on media was isolated and subcultured of purification. The pure cultured bacteria was identified as <>iRalstonia solanacearum by sequencing of 16S rRNA gene. Multiplex polymerase chain reaction using phylotype-specific primer set identified isolate as phylotype I (R. pseudosolanacearum). Phylogenetic tree was constructed based on 16S rRNA sequence and it was closed with R. pseudosolanacearum. Pathogenicity of the isolates was assessed by soil drenching inoculation on 4-week-old peanut plant. The wilt symptom was successfully reproduced by inoculation of the isolates after 14 days. This is first report of bacterial wilt caused by R. pseudosolanacearum on peanut in Korea.

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Survival of south african strains of biovar 2 and biovar 3 ofPseudomonas solanacearum in the roots and stems of weeds

Cited by 13 publications

References 6 publications

Molecular Epidemiology of Bacterial Wilt in the Madagascar Highlands Caused by Andean (Phylotype IIB-1) and African (Phylotype III) Brown Rot Strains of the Ralstonia solanacearum Species Complex

Molecular Epidemiology of Bacterial Wilt in the Madagascar Highlands Caused by Andean (Phylotype IIB-1) and African (Phylotype III) Brown Rot Strains of the Ralstonia solanacearum Species Complex

Comparative Study of the Effect of Different Weed Management Strategies on Disease Severity and Marketable Yield of Paprika (Capsicum Annuum L.) in the Smallholder Farming Sector of Zimbabwe

First Report of Bacterial Wilt by Ralstonia pseudosolanacearum on Peanut in Korea

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