Biological control of Septoria tritici blotch on wheat by Trichoderma spp. under field conditions in Argentina

Biological control is an additional tool available for the design of more sustainable control strategies of wheat diseases. Trichoderma spp. have previously been used as biocontrol agents to protect wheat plants against leaf spots diseases in Argentina, but the information from field assays is scarc...

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Detalles Bibliográficos
Autores principales: Perelló, Analía Edith, Moreno, María Virginia, Mónaco, Cecilia Inés, Simón, María Rosa, Cordo, Cristina Alicia
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Biología
Wheat diseases
Biological control
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/137539
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-137539
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Biología
Wheat diseases
Biological control
spellingShingle Biología
Wheat diseases
Biological control
Perelló, Analía Edith
Moreno, María Virginia
Mónaco, Cecilia Inés
Simón, María Rosa
Cordo, Cristina Alicia
Biological control of Septoria tritici blotch on wheat by Trichoderma spp. under field conditions in Argentina
topic_facet Biología
Wheat diseases
Biological control
description Biological control is an additional tool available for the design of more sustainable control strategies of wheat diseases. Trichoderma spp. have previously been used as biocontrol agents to protect wheat plants against leaf spots diseases in Argentina, but the information from field assays is scarce. The effectiveness of four Trichoderma harzianum strains and one T. koningii strain in reducing the incidence and severity of the leaf blotching of wheat caused by Septoria tritici blotch (STB) under two formulation conditions, spore suspension and the coated-seed technique, was studied under field conditions. Significant differences between wheat cultivars, formulation types and growth stages were found. In 2003, at the tillering stage, all of the treatments tested (except SST1 for incidence) effectively reduced the incidence or the severity of the disease compared to the control. Similarly, in 2004, ten of the treatments reduced the severity at tillering. At the heading stage, none of the treatments tested caused a significant decrease of the disease. These results indicated, therefore, that the antagonism was effective at an early stage of the disease only. Comparing both formulations, spraying spore suspension onto leaves and the coated-seed application technique, both were effective in decreasing the disease. Some isolates, such as CST4 and CST2, reduced the incidence value of STB to 40% and the severity value to 70% of the control values applied as coated-seed formulation. On the other hand, isolates T4 and T2 showed the greatest effectiveness for controlling STB, with similar reduction values to that shown by the fungicide (Folicur®) application treatment. The results of this study indicated that, although the immediate impact of Trichoderma isolates may be seen as reduced incidence and severity on the first stages of STB, in the long term, the same disease levels as found in untreated sites may be attained. This study also demonstrated that the incorporation of Trichoderma as a biocontrol preparation may be a promising step towards reducing STB disease in the field and the levels of fungicide residues in the context of a more integrated approach to the problem.
format Articulo
Articulo
author Perelló, Analía Edith
Moreno, María Virginia
Mónaco, Cecilia Inés
Simón, María Rosa
Cordo, Cristina Alicia
author_facet Perelló, Analía Edith
Moreno, María Virginia
Mónaco, Cecilia Inés
Simón, María Rosa
Cordo, Cristina Alicia
author_sort Perelló, Analía Edith
title Biological control of Septoria tritici blotch on wheat by Trichoderma spp. under field conditions in Argentina
title_short Biological control of Septoria tritici blotch on wheat by Trichoderma spp. under field conditions in Argentina
title_full Biological control of Septoria tritici blotch on wheat by Trichoderma spp. under field conditions in Argentina
title_fullStr Biological control of Septoria tritici blotch on wheat by Trichoderma spp. under field conditions in Argentina
title_full_unstemmed Biological control of Septoria tritici blotch on wheat by Trichoderma spp. under field conditions in Argentina
title_sort biological control of septoria tritici blotch on wheat by trichoderma spp. under field conditions in argentina
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/137539
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