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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 71, No. 3, 2011, pp. 412-417
Bioline Code: cj11051
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 71, No. 3, 2011, pp. 412-417

 en EVALUATION OF Trichoderma spp. check for this species in other resources AND Clonostachys spp. check for this species in other resources STRAINS TO CONTROL Fusarium circinatum check for this species in other resources IN Pinus radiata check for this species in other resources SEEDLINGS
Moraga-Suazo, Priscila; Opazo, Alex; Zaldúa, Salomé; González, Gastón & Sanfuentes, Eugenio

Abstract

The fungus Fusarium circinatum check for this species in other resources Nirenberg & O'Donnell causes pine pitch canker, an important disease for conifers worldwide. F. circinatum was first detected in Chile in 2001 and to date is present in nurseries and clonal hedges from Libertador General Bernardo O'Higgins Region to Los Ríos Region. The purpose of this study was to evaluate the potential of Trichoderma spp. check for this species in other resources and Clonostachys spp. check for this species in other resources strains to control F. circinatum in Pinus radiata check for this species in other resources D. Don seedlings in the absence of other effective control methods. Eighty-one Trichoderma spp. and Clonostachys spp. strains were evaluated through in vitro assays to determine their ability to act as antagonists of F. circinatum and 21 strains were tested for their ability to reduce post-emergence mortality and increase P. radiata survival under greenhouse conditions. During in vitro experiments, 15 strains of Trichoderma inhibited mycelial growth of the pathogen by more than 60% and one strain of Clonostachys showed parasitism of F. circinatum hyphae. Greenhouse experiments showed no control of the disease when the antagonists were added to substrate after the pathogen. However, when the antagonists were added before the pathogen, four strains (Clonostachys UDC-32 and UDC-222 and Trichoderma UDC-23 and UDC-408) reduced post-emergence mortality between 80 and 100%. Among these strains, only Clonostachys UDC-222 significantly increased the survival of P. radiata seedlings. These results showed that Clonostachys UDC-222 has the potential to be used as a biocontrol agent against F. circinatum in the production of P. radiata plants.

Keywords
Antagonists, biological control, seedling death, pitch canker

 
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