אסיף מאגר המחקר החקלאי

Prevention, with Trichoderma harzianum Rifai aggr., of reinfestation by Sclerotium rolfsii Sacc. and Rhizoctonia solani Kühn of soil fumigated with methyl bromide, and improvement of disease control in tomatoes and peanuts

Year:

1982

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Volume :

1

Co-Authors:

Elad, Y., Department of Plant Pathology and Microbiology, Faculty of Agriculture, The Hebrew University of Jerusalem, PO Box 12, Rehovot, 76 100, Israel
Hadar, Y., Department of Plant Pathology and Microbiology, Faculty of Agriculture, The Hebrew University of Jerusalem, PO Box 12, Rehovot, 76 100, Israel
Chet, I., Department of Plant Pathology and Microbiology, Faculty of Agriculture, The Hebrew University of Jerusalem, PO Box 12, Rehovot, 76 100, Israel
Henis, Y., Department of Plant Pathology and Microbiology, Faculty of Agriculture, The Hebrew University of Jerusalem, PO Box 12, Rehovot, 76 100, Israel

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Abstract:

Application of Trichoderma harzianum Rifai aggr. after soil fumigation with methyl bromide improved the control of Sclerotium rolfsii Sacc. and Rhizoctonia solani Kühn in a peanut field. Although soil fumigation controlled the diseases caused by these pathogens, it was followed by rapid reinfestation by S. rolfsii and R. solani. The biological control agent T. harzianum prevented reinfestation of the fumigated soil by the pathogens (88% reduction) both in a controlled environment and in field conditions. In soil treated with T. harzianum, survival of sclerotia was considerably less than in the untreated control. The combined treatment, of fumigation and T. harzianum applications, caused almost total mortality of sclerotia in soil in the laboratory and in the field. Application of T. harzianum to the root zone of tomatoes effectively controlled S. rolfsii in a field naturally infested with S. rolfsii and R. solani. Transplanting plants treated with T. harzianum into soil fumigated with methyl bromide reduced disease incidence by 93% and increased yield by 160%. © 1982.

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