Effect of ammonium/nitrate ratio in nutrient solution on control of Fusarium wilt of tomato by Trichoderma asperellum T34

The behaviour of Fusarium oxysporum f.sp. lycopersici (Fol) and the effectiveness of the microbial control agent Trichoderma asperellum strain T34 were examined in hydroponically grown tomato plants under five ammonium/nitrate ratios. The results showed that disease severity was reduced by the actio...

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Bibliographic Details
Published in:Plant pathology 2012-02, Vol.61 (1), p.132-139
Main Authors: Borrero, C., Trillas, M.I., Delgado, A., Avilés, M.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
Fusarium oxysporum f.sp. lycopersici
iron
nitrogen
nutrient solution
perlite
Phytopathology. Animal pests. Plant and forest protection
populations
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Summary:The behaviour of Fusarium oxysporum f.sp. lycopersici (Fol) and the effectiveness of the microbial control agent Trichoderma asperellum strain T34 were examined in hydroponically grown tomato plants under five ammonium/nitrate ratios. The results showed that disease severity was reduced by the action of T34 under increasing concentrations of ammonia. Furthermore, rhizosphere F. oxysporum populations decreased with T34 application. The presence of T34 augmented leaf nitrogen concentration in treatments infested with Fol. In addition, T34 application reduced iron concentration in tomato leaves at high ammonium/nitrate ratios and reduced the severity of Fusarium wilt at high iron and nitrogen leaf concentrations.
ISSN:0032-0862
1365-3059
DOI:10.1111/j.1365-3059.2011.02490.x