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Lessons from interactions within the cassava green mite fungal pathogen Neozygites tanajoae system and prospects for microbial control using Entomophthorales

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Diseases of Mites and Ticks

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Abstract

Most fungal pathogens lack the capacity to search for their host but rather develop sit-and-wait strategies that favour contact with them. The success of these strategies depends upon the interactions of the pathogen with its host, the host plant and the environmental conditions, which altogether determine its transmissibility. Given the limited success that has characterized application of sustainable microbial control, particularly using Entomophthorales, interaction studies have been conducted with the entomophthoralean fungus Neozygites tanajoae, pathogenic to the cassava green mite (CGM), Mononychellus tanajoa, to help understand differences observed between laboratory and field performances of this pathogen. Reciprocal pathogen-host interactions as well as tritrophic interactions involving the host plant were studied. It was found that herbivory triggers the release of volatiles that promote sporulation of isolates of N. tanajoae, whereas the host mite avoids haloes of spores of this pathogen. However, the host mite does not avoid the pathogen when inside the mummified fungus-killed cadaver. The status of microbial control of CGM in Africa is reviewed and implications of these interactions are discussed for prospective application of microbial control using Entomophthorales.

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  1. Fabien C. C. Hountondji

    Present address: Expertise, Action and Research for Development (EAR-Development), P.O. Box 2015, Abomey-Calavi, Republic of Benin

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  1. Biological Control Centre for Africa, International Institute of Tropical Agriculture, Cotonou, Republic of Benin

    Fabien C. C. Hountondji

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Hountondji, F.C.C. (2008). Lessons from interactions within the cassava green mite fungal pathogen Neozygites tanajoae system and prospects for microbial control using Entomophthorales. In: Bruin, J., van der Geest, L.P.S. (eds) Diseases of Mites and Ticks. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9695-2_16

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