Biological control to reduce inoculum of the tan spot pathogen Pyrenophora tritici-repentis in surface-borne residues of wheat fields

• Published in: Phytopathology Vol. 83; no. 4; pp. 371 - 375
• Main Authors: Pfender, W.F. (Kansas State University, Manhattan), Zhang, W, Nus, A
• Format: Journal Article
• Language: English
• Published: St. Paul, MN American Phytopathological Society 01-04-1993
• Subjects: AGENT PATHOGENE; Agronomy. Soil science and plant productions; APHYLLOPHORALES; AUXILIAIRE DE LUTTE BIOLOGIQUE; Biological and medical sciences; Biological control; CHAMPIGNON; Control; CONTROL CULTURAL; Fundamental and applied biological sciences. Psychology; Fungal plant pathogens; HONGOS; KANSAS; LABRANZA DE CONSERVACION; LUTTE CULTURALE; ORGANISMOS PARA CONTROL BIOLOGICO; ORGANISMOS PATOGENOS; Phytopathology. Animal pests. Plant and forest protection; PITHOMYCES; PYRENOPHORA; Pyrenophora tritici-repentis; RESIDU DE RECOLTE; RESIDUOS DE COSECHAS; TRAVAIL DU SOL DE CONSERVATION; TRITICUM; Triticum aestivum; Monocotyledones; Plant pathogen; Biological control; Treatment efficiency; Biological agent; Basidiomycetes; Cereal crop; Field experiment; Vegetal waste; Straw; Surface; Fungi; Microbiological control; Gramineae; Conservation tillage; Angiospermae; Pyrenophora tritici-repentis; Ascomycetes; Spermatophyta; Antagonist; Fungi Imperfecti; Triticum aestivum; Thallophyta; Inoculum
• ISSN: 0031-949X; 1943-7684
• DOI: 10.1094/Phyto-83-371

Field plots of conservation-tillage wheat straw naturally infested with Pyrenophora tritici-repentis were treated with bran-based inoculum of three potential biocontrol fungi, and reduction in the number of residue-borne pseudothecia (primary inoculum of the pathogen) was determined. Limonomyces roseipellis significantly reduced residue-borne primary inoculum of P. tritici-repentis in 3 of 4 yr of experiments; an unidentified agonomycete was effective in two of three experiments, but Laetisaria arvalis was ineffective. Although L. roseipellis reduced inoculum by 60-80%, greater reductions would be necessary for acceptable control of this disease. Retention of dry bran-based inoculum on straw was enhanced by the use of alginate, but further improvements in formulation and application methods are required for effective biocontrol of pathogens in surface-borne crop residues