scholarly journals Interaction between Meloidogyne incognita and Rhizoctonia solani on green beans

2015 ◽  
Vol 22 (5) ◽  
pp. 570-574 ◽  
Author(s):  
A.S. Al-Hazmi ◽  
S.N. Al-Nadary
Keyword(s):  
Rhizoctonia Solani ◽  
Meloidogyne Incognita ◽  
Green Beans

scholarly journals Potential of Pseudomonas putida, Bacillus subtilis, and their mixture on the management of Meloidogyne incognita, Pectobacterium betavasculorum, and Rhizoctonia solani disease complex of beetroot (Beta vulgaris L.)

2019 ◽  
Vol 29 (1) ◽  
Author(s):  
Manzoor R. Khan ◽  
Zaki A. Siddiqui
Keyword(s):  
Bacillus Subtilis ◽  
Rhizoctonia Solani ◽  
Pseudomonas Putida ◽  
Beta Vulgaris ◽  
Meloidogyne Incognita ◽  
Root Rot ◽  
Growth Parameters ◽  
Principal Component ◽  
Soft Rot ◽  
Disease Complex

AbstractEffects of Pseudomonas putida and Bacillus subtilis alone, and in combinations for the management of Meloidogyne incognita, Pectobacterium betavasculorum, and Rhizoctonia solani disease complex of beetroot (Beta vulgaris L.), were studied. Application of P. putida or B. subtilis to plants with M. incognita or P. betavasculorum or R. solani singly or in combinations caused a significant increase in plant growth parameters and the activities of defense enzymes. A significant increase in chlorophyll fluorescence attributes, viz., Fv/Fm, ɸPSII, qP, NPQ, and ETR were recorded in plants treated with P. putida or B. subtilis over pathogen-inoculated plants. Inoculation of P. putida results in a higher reduction in galling and nematode multiplication than B. subtilis. Maximum reduction in nematode multiplication and galling occurred when a mixture of P. putida and B. subtilis was used. Soft rot and root rot indices were 3 when Pectobacterium betavasculorum and Rhizoctonia solani were inoculated alone. The disease indices were rated 5 when these pathogens and M. incognita were inoculated in combinations. Inoculation of P. putida/B. subtilis with P. betavasculorum or R. solani reduced soft rot and root rot indices to 2 out of 3, while the use of P. putida + B. subtilis reduced indices to 1. Disease indices were reduced to 2–3 out of 5, when P. putida + B. subtilis were used to plants inoculated with two or three pathogens. The principal component analysis showed significant correlations among the various studied attributes. Two principal components explained a total of 86.1 and 93.4% of the overall data variability. Therefore, the use of P. putida together with B. subtilis had the potential for successful management of disease complex of beetroot.

Effects of Meloidogyne incognita, Pectobacterium betavasculorum and Rhizoctonia solani interactions on growth, physiological and biochemical changes of beetroot

2020 ◽  
pp. 1-18
Author(s):  
Manzoor R. Khan ◽  
Zaki A. Siddiqui
Keyword(s):  
Antioxidant Enzymes ◽  
Plant Growth ◽  
Rhizoctonia Solani ◽  
Meloidogyne Incognita ◽  
Root Rot ◽  
Dry Weight ◽  
Soft Rot ◽  
Maximum Reduction ◽  
Physiological And Biochemical

Abstract Effect of Meloidogyne incognita, Pectobacterium betavasculorum and Rhizoctonia solani alone, pre, post and simultaneous inoculations to find out role of each pathogen on growth, chlorophyll and carotenoid, superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), ascorbate peroxidase (APX), glutathione peroxidase (GPX), glutathione reductase (GR) activities and proline, H2O2 and malondialdehyde (MDA) of beetroot (Beta vulgaris L). Inoculation of plants with M. incognita / P. betavasculorum or R. solani reduced plant growth (root dry weight) (42.0%), chlorophyll (24.2%) and carotenoid (47.7%) while inoculation of pathogens under study resulted in increased activities of antioxidant enzymes, proline, H2O2 and MDA. Combined inoculation of pathogens under study resulted in greater reduction of plant growth (74.9%), chlorophyll (55.3%) and carotenoid (83.7%) than individual pathogen. Greatest reduction in plant growth, chlorophyll and carotenoid and maximum activities of antioxidant enzymes, proline, H2O2 and MDA were observed when M. incognita was inoculated 20 days prior to P. betavasculorum plus R. solani. P. betavasculorum and R. solani reduced galling and nematode multiplication but maximum reduction in galling (82.8%) and nematode multiplication (82.7%) was observed when P. betavasculorum plus R. solani were inoculated prior to nematodes. Necrosis soft rot and root rot indices by P. betavasculorum and R. solani were 3 respectively. Disease indices were 5 when two or more pathogens were inoculated together. Prior inoculation of M. incognita predisposed beetroots to P. betavasculorum and R. solani and aggravates the disease.

Comparative tolerances of two Cucumis species to salinity, Rhizoctonia solani and Meloidogyne incognita

2013 ◽  
Vol 12 (2) ◽  
pp. 178-184 ◽  
Author(s):  
Barakat E. Abu Irmaileh ◽  
Akel N. Mansour ◽  
Luma S. Al Banna ◽  
Huda O. Badwan
Keyword(s):  
Disease Resistance ◽  
Rhizoctonia Solani ◽  
Meloidogyne Incognita ◽  
Wild Species ◽  
Wild Relatives ◽  
Damping Off ◽  
Root Knot Nematode ◽  
Resistant Genes ◽  
Potential Source ◽  
Cucumis Species

The search for disease resistance in wild types is continuing, in order to introduce resistant genes from wild relatives. In this study, we found that the wild melon Cucumis prophetarum was comparably more tolerant to salinity, the damping-off disease caused by the fungus Rhizoctonia solani and the root-knot nematode Meloidogyne incognita. The percentage of wild melon survival was 60% compared to that of the cultivated cucumber Cucumis sativus, which was 15%, when irrigated with NaCl at a concentration of 2500 ppm; and 96% for the wild melon compared with 44% for the cultivated cucumber when irrigated with CaSO4.2H2O at a concentration of 1000 ppm. Wild melon plants were more tolerant to R. solani attack, as only 20% of the plants were infested compared with 100% of infestation observed for the cultivated cucumber. The average number of nematode galls was 250 per plant on the cultivated cucumber when compared with 6.3 per plant on the wild species. Wild melon could be a potential source of resistant or tolerant genes that can be transferable to cultivated cucumbers.

scholarly journals Root Diseases and Nematodes in Bahiagrass-Vegetable Rotations

Plant Disease ◽  
1999 ◽  
Vol 83 (1) ◽  
pp. 55-59 ◽  
Author(s):  
D. R. Sumner ◽  
N. A. Minton ◽  
T. B. Brenneman ◽  
G. W. Burton ◽  
A. W. Johnson
Keyword(s):  
Beneficial Effect ◽  
Rhizoctonia Solani ◽  
Disease Severity ◽  
Meloidogyne Incognita ◽  
Pathogenic Fungi ◽  
Plant Populations ◽  
Root Knot Nematodes ◽  
Snap Bean ◽  
Root Diseases ◽  
Root Injury

A double-crop of cucumber-snap bean was grown continuously for 4 years and compared with rotations of 1, 2, or 3 years of bahiagrass followed by vegetables. No nematicides or soil fungicides were applied. Root and hypocotyl disease severity in snap bean from Rhizoctonia solani AG-4 and Pythium spp. was decreased after 2 years of bahiagrass compared with 1 year of bahiagrass and 1 year of vegetables or continuous vegetables. Root galling caused by Meloidogyne incognita was less following 2 or 3 years, but not 1 year, of bahiagrass than following continuous vegetables. The beneficial effect of the rotation with bahiagrass lasted only 1 year. Then root injury from soilborne pathogenic fungi and root-knot nematodes was similar to that in continuous vegetables. Plant populations and yield of vegetables were greater following 3 years of bahiagrass than following 1 year of bahiagrass and 3 years of vegetables or continuous vegetables. Two years of bahiagrass followed by 1 or 2 years of vegetables did not increase yield of vegetables consistently.

Chitosan–cinnamon beads enhance suppressive activity against Rhizoctonia solani and Meloidogyne incognita in vitro

2014 ◽  
Vol 66 ◽  
pp. 44-47 ◽  
Author(s):  
Dong-Jun Seo ◽  
Dang-Minh-Chanh Nguyen ◽  
Ro-Dong Park ◽  
Woo-Jin Jung
Keyword(s):  
Rhizoctonia Solani ◽  
Meloidogyne Incognita ◽  
Suppressive Activity
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