Biological control of Rhizoctonia solani in tomatoes with Trichoderma harzianum mutants
Electron. j. biotechnol
; 13(2): 1-2, Mar. 2010. ilus, tab
Article
Dans En
| LILACS
| ID: lil-567079
Responsable en Bibliothèque :
CL1.1
ABSTRACT
Biocontrol of Rhizoctonia solani in tomatoes cultivated under greenhouse and field conditions was analyzed using the Trichoderma harzianum mutants Th650-NG7, Th11A80.1, Th12A40.1, Th12C40.1 and Th12A10.1 and ThF2-1, respectively. Their innocuousness on tomato cultivars 92.95 and Gondola (greenhouse assays), and on cultivar Fortaleza (field assays) was established. Alginate pellets (1.7 g pellets/L soil) containing c.a1 x 10(5) colony forming units (cfu)/g pellet were applied to a soil previously inoculated with R. solani at transplant (greenhouse) or to a naturally infected soil (field). Controls considered parental wild strains, a chemical fungicide and no additions. Th11A 80.1, Th12A10.1 and Th650-NG7 prevented the 100% mortality of tomato plants cv. 92.95 caused by R. solani, and the 40% mortality in tomato plants cv. Gondola (greenhouse assays). Mortality reduction was reflected in canker level lessening and in plant parameters increases (development, fresh and dry weights). A different degree of susceptibility of tomato plants was observed, being Gondola cv. more resistant than 92.95 cv. to infection in a soil previously inoculated with R. solani. Tomato plants of cv. Fortaleza did not show mortality in naturally infected soils (field assays), where the mutant ThF2-1 reduced significantly the canker level caused by R. solani.
Texte intégral:
1
Indice:
LILACS
Sujet Principal:
Rhizoctonia
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Trichoderma
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Lutte biologique contre les nuisibles
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Solanum lycopersicum
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Antibiose
langue:
En
Texte intégral:
Electron. j. biotechnol
Thème du journal:
BIOTECNOLOGIA
Année:
2010
Type:
Article
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Project document