Biocontrol of Septoria tritici blotch disease of wheat using Trichoderma isolates

Document Type : Research Paper

Authors

1 Plant Pathology Division, Department of Plant Protection, Agriculture Faculty, Collage of Agriculture & Natural Resources, University of Tehran, Karaj, Iran.

2 Department of Agriculture, Medicinal Plants and Drugs Research Institute, Shahid Beheshti University, Tehran, Iran.

3 Department of Biological Control Research, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran.

Abstract

Over the past two decades, biological control of wheat septoria tritici blotch (STB) caused by Zymoseptoria tritici has been evaluated as a reliable and safe alternative or complement to chemical control. The genus Trichoderma includes several biocontrol agents (BCAs) widely used worldwide against plant diseases. Besides direct control of plant pathogens, Trichoderma spp as BCAs provide numerous other beneficial features for their plant hosts. The current study aimed to assess the potential biocontrol ability of several antagonistic Trichoderma isolates with endophytic potential on STB reduction in wheat cultivar Tirgan under greenhouse conditions. The antagonists were used as a seed-coated treatment at the sowing time and sprayed on the plants 72 h before Z. tritici IPO323 inoculation. STB severity was calculated 21 days after the pathogen inoculation. The biocontrol isolates significantly (α = 0.01) reduced the disease severity on cv. Tirgan. T. harzianum AS12-2 provided the highest average percentage of STB inhibition in both application methods. Application of T. harzianum AS12-2 led to a reduction in the percentage of leaf area covered by lesions (PLACL) and the percentage of leaf area covered by pycnidia (PLACP) by 80.12% and 77.71%, respectively. Trichoderma biocontrol isolates could be considered safe and reliable alternatives/complements for sustainable agriculture in integrated management programs of wheat STB.

Keywords


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