Biological control of red stele (Phytophthora fragariae var. fragariae) and crown rot (P. c a c t o r u m ) disease of strawberry with rhizobacteria

2008 ◽  
Vol 115 (2) ◽  
pp. 49-56 ◽  
Author(s):  
J. Anandhakumar ◽  
W. Zeller
Keyword(s):  
Biological Control ◽  
Crown Rot ◽  
Phytophthora Fragariae ◽  
Red Stele

scholarly journals Reduction of Landscape Pathogens in Florida by Soil Solarization

Plant Disease ◽  
2002 ◽  
Vol 86 (12) ◽  
pp. 1388-1395 ◽  
Author(s):  
R. J. McGovern ◽  
R. McSorley ◽  
M. L. Bell
Keyword(s):  
Biological Control ◽  
Crown Rot ◽  
Soil Solarization ◽  
Shoot Biomass ◽  
Infested Soil ◽  
Pseudomonas Chlororaphis ◽  
Biological Control Agents ◽  
Central Florida ◽  
Air Space ◽  
Polyethylene Mulch

Two experiments were conducted during autumn 1997 and 1998 in west-central Florida to evaluate the effectiveness of soil solarization alone and in combination with the biological control agents Streptomyces lydicus (Actinovate) and Pseudomonas chlororaphis (syn. P. aureofasciens, AtEze) and the reduced-risk fungicide fludioxonil (Medallion) in managing soilborne pathogens of impatiens (Impatiens × wallerana, ‘Accent Burgundy’). Naturally infested soil was solarized for 47 or 48 days during September and October using two layers of 25-μm clear, low-density polyethylene mulch, separated by an air space of up to 7.5 cm. Solarization decreased the final incidence and progress of Rhizoctonia crown rot and blight, incidence of Pythium spp. in roots, and root discoloration, and increased shoot biomass in both experiments. The technique also consistently reduced root-knot severity and population densities of Meloidogyne incognita, Dolichodorus heterocephalus, Paratrichodorus minor, and Criconemella spp. The incidence of Rhizoctonia crown rot and blight was reduced by fludioxonil, but not by the biological control agents.

Lysis and biological control of Aspergillus niger by Bacillus subtilis AF 1

1996 ◽  
Vol 42 (6) ◽  
pp. 533-538 ◽  
Author(s):  
A. R. Podile ◽  
A. P. Prakash
Keyword(s):  
Biological Control ◽  
Bacillus Subtilis ◽  
Aspergillus Niger ◽  
Fungal Growth ◽  
Dry Weight ◽  
Crown Rot ◽  
Fungal Mycelium ◽  
Infested Soil ◽  
Dual Culture ◽  
Bacterial Cells

A biocontrol rhizobacterial strain of Bacillus subtilis AF 1 grown for 6 h was coinoculated with Aspergillus niger at different time intervals and microscopic observations revealed adherence of bacterial cells to the fungal mycelium. Bacterial cells multiplied in situ and colonized the mycelial surface. Growth of AF 1 resulted in damage to the cell wall, followed by lysis. AF 1 inoculation into media containing A. niger at 0, 6, and 12 h suppressed >90% fungal growth, while in 18- and 24-h cultures fungal growth inhibition was 70 and 56%, respectively, in terms of dry weight. In dual culture the fungal growth was not accompanied by formation of spores. The mycelial preparation of A. niger as principal carbon source supported the growth of B. subtilis, as much as chitin. Extracellular protein precipitate from B. subtilis culture filtrate had a significant growth-retarding effect on A. niger. Groundnut seeds bacterized with B. subtilis showed a reduced incidence of crown rot in A. niger infested soil, suggesting a possible role of B. subtilis in biological control of A. niger.Key words: mycolytic bacteria, Bacillus subtilis, Aspergillus niger, biological control.

SCREENING OF STRAWBERRIES WITH THE RED STELE (PHYTOPHTHORA FRAGARIAE) RESISTANCE GENE RPF1 USING SEQUENCE SPECIFIC DNA MARKERS

2007 ◽  
pp. 165-169 ◽  
Author(s):  
A. Sasnauskas ◽  
R. Rugienius ◽  
D. Gelvonauskiené ◽  
I. Zalunskaitė ◽  
G. Stanienė ◽  
...  
Keyword(s):  
Resistance Gene ◽  
Dna Markers ◽  
Phytophthora Fragariae ◽  
Red Stele

Molecular Markers Linked to Phytophthora fragariae Resistance Genes in Strawberry

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 500a-500 ◽  
Author(s):  
K.M. Haymes ◽  
S.C. Hokanson ◽  
K. Salazar ◽  
J. Maas
Keyword(s):  
Molecular Markers ◽  
Resistance Genes ◽  
Bulked Segregant Analysis ◽  
Aflp Markers ◽  
Avirulence Genes ◽  
Phytophthora Fragariae ◽  
Red Stele ◽  
Strawberry Breeding ◽  
Direct Applicability ◽  
Selection Of

The commercial strawberry (Fragaria × ananassa Duch.) is susceptible to red stele root rot caused by the fungus Phytophthora fragariae Hickman var. fragariae. Characteristics of the disease are the reddened steles and “rat tail” appearance of the roots. Infected plants are dwarfed, exhibit wilting, and eventually die. Red stele resistance in strawberries and virulence of P. fragariae behave according to the gene-for-gene system. Resistance genes and their corresponding avirulence genes have been identified by screening plant roots for infection. The goal of this international research project with CPRO-DLO, The Netherlands, is to develop highly specific molecular markers for various Rpf resistance genes (Rpf1, Rpf2, Rpf3, and Rpf6) that confer resistance against P. fragariae. Bulked Segregant Analysis was used to identify RAPD and AFLP markers putatively linked to P. fragariae resistance genes. The bulked DNAs representing subsets of three F1 populations that segregated monogenically for either resistance or susceptibility to P. fragariae. The map of these Rpf loci was generated using JoinMap®. The RAPD markers linked to the resistance genes are being converted into SCAR markers, while the AFLP markers will be used as probes for the detection of P. fragariae. The application of the molecular markers linked to resistance genes will have direct applicability to strawberry breeding programs. Marker-facilitated selection of these resistance genes would allow an efficient means in the screening and selection of plant material containing these genes and help in the pyramiding for resistance to P. fragariae. Genetic improvement of the strawberry by the ability to pyramid resistance genes will contribute to the productivity of the strawberry industry worldwide.

scholarly journals Screening of Rhizobacteria for Biological Control of Cucumber Root and Crown Rot Caused by Phytophthora drechsleri

2011 ◽  
Vol 27 (1) ◽  
pp. 78-84 ◽  
Author(s):  
Mojdeh Maleki ◽  
Lachin Mokhtarnejad ◽  
Somayyeh Mostafaee
Keyword(s):  
Biological Control ◽  
Crown Rot ◽  
Cucumber Root ◽  
Phytophthora Drechsleri ◽  
Root And Crown Rot

scholarly journals Red stele root disease of strawberry caused by Phytophthora fragariae

1965 ◽  
Vol 30 (5) ◽  
pp. 239-245
Author(s):  
Hitoshi MORITA
Keyword(s):  
Root Disease ◽  
Phytophthora Fragariae ◽  
Red Stele

RED STELE RESISTANT STRAWBERRIES AND THEIR ROLE IN EPIDEMIOLOGY OF PHYTOPHTHORA FRAGARIAE

1993 ◽  
pp. 517-517
Author(s):  
S. Khanizadeh ◽  
D. Buzard
Keyword(s):  
Phytophthora Fragariae ◽  
Red Stele

BIOLOGICAL CONTROL OF RED STELE OF STRAWBERRY WITH BACTERIAL ANTAGONISTS

2005 ◽  
pp. 363-366 ◽  
Author(s):  
M. Gupta ◽  
L.N. Bhardwaj ◽  
R.C. Sharma
Keyword(s):  
Biological Control ◽  
Bacterial Antagonists ◽  
Red Stele
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