Effects of UV-B radiation on Lecanicillium spp., biological control agents of the coffee leaf rust pathogen.

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Author(s): GALVAO, J. A. H.; BETTIOL, W.

Summary: Coffee leaf rust is the main disease of coffee and its causal agent is naturally hyperparasited by Lecanicillium lecanii, indicating its potential for biocontrol. Ultraviolet-B (UV-B) radiation is an important factor that interferes on application of biocontrol agents, and Lecanicillium can be affected by UV-B. The objective of this work was to evaluate the effects of UV-B on Lecanicillium isolates and on its capacity to colonize rust lesions. There were variations among Lecanicillium strains in sensitivity to UV-B radiation, causing inactivation and delayed spore germination. The most tolerant strain (CCMA-1143) had LD50=1.63 kJ/m2 of UV-B. The incidence and colonization of Lecanicillium on coffee leaf rust lesions were influenced by the dose of UV-B radiation, and were increased when the isolate CCMA-1143 was sprayed on rust lesions. The effects of UV-B should be considered on efficacy studies for the development of biopesticides.

Publication year: 2014

Types of publication: Journal article

Unit: Embrapa Environment

Keywords: Biological control, Biopesticides, Café, Climate change, Coffee, Controle biológico, Ferrugem, Hemileia vastatrix, Leaf rust, Lecanicillium, UV-B, Ultraviolet radiation

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