Control of the bean rust fungus <Emphasis Type="Italic">Uromyces appendiculatus</Emphasis> by means of <Emphasis Type="Italic">Trichoderma harzianum</Emphasis>: leaf disc assays on the antibiotic effect of spore suspensions and culture filtrates |
| |
Authors: | Lars Burmeister Bernhard Hau |
| |
Institution: | 1.Institut für Pflanzenkrankheiten und Pflanzenschutz,Leibniz Universit?t Hannover,Hannover,Germany |
| |
Abstract: | Several species of the fungal genus Trichoderma act as antagonists of other fungi. A number of strains from the Trichoderma species T. harzianum Rifai are used as biological control agents for the control of soilborne as well as foliar plant pathogens. Six T. harzianum strains, five of them isolated from commercial preparations, were evaluated for their capability to control the bean rust
fungus Uromyces appendiculatus (Pers. ex Pers.) Unger. Different kinds of leaf disc assays were performed with conidial spore suspensions and sterile culture
filtrates of the T. harzianum strains. Great differences were observed concerning the efficacy of the Trichoderma strains to reduce the number of the uredial pustules developing after rust inoculation which followed the application of
the particular Trichoderma strains. Efficacy values ranged from 1 to over 50%. Increasing spore or culture filtrate concentrations of the two most effective
isolates T12 and TU led to decreases in the number of developing uredial pustules. Culture filtrate applications had a protective but no curative
effect. T12 spore suspensions maintained their disease reducing activity even when autoclaved. This and some other evidence
for an antibiotic interaction between T. harzianum and U. appendiculatus are discussed.
Handling Editor: Reijo Karjalainen. |
| |
Keywords: | Trichoderma harzianum Bean rust Uromyces appendiculatus Biological control Antibiosis |
本文献已被 SpringerLink 等数据库收录! |