Identification fungal causing leaf spot on tomato and biological control by the antagonists isolated from the rhizosphere of tomato in sistan

Document Type : Complete paper

Authors

1 Former M.Sc. Student, Department of Plant Pathology, Faculty of Agriculture, University of Zabol, Iran

2 Associate Professor, Department of Plant Pathology, Faculty of Agriculture, University of Zabol, Iran

Abstract

In order to identify and biological control of the causal agents of leaf spot on tomato in Sistan area, sampling from different fields and greenhouses have been done during the years of 2013_2014. Isolation and identification of species was achieved by using standard methods in laboratory. Finally, 102 fungi isolates were obtained and placed in 6 species of Alternaria alternate, A. dumosa, A. tenuissima, A. mimicula, A. tomaticola and Cladosporium cladosporiodes based on morphological characteristics. All of the isolated fungi were pathogenic on tomato. In this study, C. cladosporiodes is reported as the factor of disease on tomato for first time in Iran. For the sake of biological control of pathogens, from all 220 isolate of bacteria and fungi isolated from tomato rhizospheres, 10 isolates showed high antagonistic effects against pathogenic fungi using dual- culture tests. These isolates were Trichoderma harzianum, T. virens and Bacillus subtilis. In laboratorial studies, it had been revealed that T. harzianum, T. virens, BS1 and BS2 had higher antagonistic effects. The highest inhibitory effect on A. alternata was 55.67, 52.83, 58.71 and 58.57 percent, respectively. Because of this reason, these isolates were selected for biocontrol experiments in greenhouse conditions. Based on the results of greenhouse experiments, antagonistic isolates caused a decrease in the intensity of pathogenicity and improved the performance of crop characteristics. Among the antagonistic fungi, T. harzianum, and among the bacterial isolates, BS1 had shown a better result antifungal activity.

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