scholarly journals Differential interactions between strains ofRhizorhapis,Sphingobium,SphingopyxisorRhizorhabdusand accessions ofLactucaspp. with respect to severity of corky root disease

2014 ◽  
Vol 63 (5) ◽  
pp. 1053-1061 ◽  
Author(s):  
A. H. C. van Bruggen ◽  
O. Ochoa ◽  
I. M. Francis ◽  
R. W. Michelmore
Keyword(s):  
Root Disease ◽  
Corky Root

The vicious cycle of lettuce corky root disease: effects of farming system, nitrogen fertilizer and herbicide

2014 ◽  
Vol 388 (1-2) ◽  
pp. 119-132 ◽  
Author(s):  
Ariena H. C. van Bruggen ◽  
Isolde M. Francis ◽  
Randy Krag
Keyword(s):  
Nitrogen Fertilizer ◽  
Farming System ◽  
Root Disease ◽  
Vicious Cycle ◽  
Corky Root

Phenology and fungus-nematode relations of corky root disease of Douglas-fir

1971 ◽  
Vol 69 (3) ◽  
pp. 265-276 ◽  
Author(s):  
W. J. BLOOMBERG ◽  
JACK R. SUTHERLAND
Keyword(s):  
Douglas Fir ◽  
Root Disease ◽  
Corky Root

Management of corky root disease of tomato in participation with organic tomato growers

2009 ◽  
Vol 28 (2) ◽  
pp. 155-161 ◽  
Author(s):  
M.K. Hasna ◽  
E. Ögren ◽  
P. Persson ◽  
A. Mårtensson ◽  
B. Rämert
Keyword(s):  
Root Disease ◽  
Corky Root

Corky root disease of Douglas-fir seedlings: pathogenicity of the nematode Xiphinemabakeri alone and in combination with the fungus Cylindrocarpondestructans

1977 ◽  
Vol 7 (1) ◽  
pp. 41-46 ◽  
Author(s):  
Jack R. Sutherland
Keyword(s):  
Synergistic Effects ◽  
Douglas Fir ◽  
Root Disease ◽  
Nematode Population ◽  
Disease Symptoms ◽  
Corky Root ◽  
Growth Room

Growth-room studies were made to determine both, alone and combined, the pathogenicity of the nematode Xiphinemabakeri Williams and the fungus Cylindrocarpondestructans (Zinnsm.) Scholten to Douglas-fir [Pseudotsugamenziesii (Mirb.) Franco] seedlings. Inoculations with 20, 40, and 60 X. bakeri nematodes per seedling resulted in nematode population increases and development of typical corky root disease symptoms. Cylindrocarpondestructans was not pathogenic to seedlings; no consistent synergistic effects were detected when inoculations were made with the nematode and fungus together. It was concluded that X. bakeri is the 'primary' pathogen in corky root etiology.

Use of composts to manage corky root disease in organic tomato production

2007 ◽  
Vol 151 (3) ◽  
pp. 381-390 ◽  
Author(s):  
M.K. Hasna ◽  
A. Mårtensson ◽  
P. Persson ◽  
B. Rämert
Keyword(s):  
Root Disease ◽  
Tomato Production ◽  
Corky Root

scholarly journals Molecular and Environmental Triggering Factors of Pathogenicity of Fusarium oxysporum and F. solani Isolates Involved in the Coffee Corky-Root Disease

2021 ◽  
Vol 7 (4) ◽  
pp. 253
Author(s):  
Roberto Gamboa-Becerra ◽  
Daniel López-Lima ◽  
Luc Villain ◽  
Jean-Christophe Breitler ◽  
Gloria Carrión ◽  
...  
Keyword(s):  
Water Stress ◽  
Root Disease ◽  
Plant Colonization ◽  
Root Knot Nematode ◽  
Corky Root ◽  
Meloidogyne Spp ◽  
High Throughput Phenotyping ◽  
Coffee Plants ◽  
Combined Infection ◽  
Six Genes

Coffee corky-root disease causes serious damages to coffee crop and is linked to combined infection of Fusarium spp. and root-knot nematodes Meloidogyne spp. In this study, 70 Fusarium isolates were collected from both roots of healthy coffee plants and with corky-root disease symptoms. A phylogenetic analysis, and the detection of pathogenicity SIX genes and toxigenicity Fum genes was performed for 59 F. oxysporum and 11 F. solani isolates. Based on the molecular characterization, seven F. oxysporum and three F. solani isolates were assessed for their pathogenicity on coffee seedlings under optimal watering and water stress miming root-knot nematode effect on plants. Our results revealed that a drastic increment of plant colonization capacity and pathogenicity on coffee plants of some Fusarium isolates was caused by water stress. The pathogenicity on coffee of F. solani linked to coffee corky-root disease and the presence of SIX genes in this species were demonstrated for the first time. Our study provides evidence for understanding the pathogenic basis of F. oxysporum and F. solani isolates on coffee and revealed the presence of SIX and Fum genes as one of their pathogenicity-related mechanisms. We also highlight the relevance of chlorophyll, a fluorescence as an early and high-throughput phenotyping tool in Fusarium pathogenicity studies on coffee.

Corky Root Disease of Douglas-fir: Relation of Xiphinemabakeri Nematodes to Symptom Severity, and Observations on Seedling Tissue and Soil Nutrients

1973 ◽  
Vol 3 (2) ◽  
pp. 299-303 ◽  
Author(s):  
Jack R. Sutherland ◽  
L. J. Sluggett
Keyword(s):  
Lateral Roots ◽  
Nutrient Content ◽  
Douglas Fir ◽  
Root Disease ◽  
Root Volume ◽  
Disease Symptoms ◽  
Corky Root ◽  
Disease Occurrence ◽  
Different Depths ◽  
Coastal British Columbia

Four-month-old Douglas-fir Pseudotsugamenziesii Mirb. (Franco) seedlings were collected from a coastal British Columbia forest nursery, and the number of Xiphinemabakeri nematodes per cubic millimeter of root volume was related to the severity of several corky root disease symptoms. The strongest relationships existed between nematode root populations and seedling epicotyl length, and the number of first-order lateral roots over 5 mm long. Diseased and healthy seedlings were analyzed for tissue nutrients. Healthy seedlings contained significantly more nitrogen (N), phosphorus (P), potassium (K), magnesium (Mg), and chlorophyll, and significantly less calcium (Ca) than diseased plants. The nutrient content of soil samples collected at 0–4, 4–8, 8–12, and 12–16 cm depths from areas with or without diseased seedlings was determined. The N, Ca, Mg, and conductance levels of soils from the healthy seedling area were significantly greater than those from the disease-infested area, but no other pertinent differences, relating to disease occurrence, were found in the nutrient content of samples from the different depths, and no relevant disease class - sampling depth interactions were detected. Several factors, which help explain the recent increased incidence of corky root disease, are discussed.

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