Survival of Neozygites cf. floridana (Zygomycetes: Entomophthorales) in mummified cassava green mites and the viability of its primary conidia |
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Authors: | George I. Oduor John S. Yaninek Leo P. S. van der Geest Gilberto J. de Moraes |
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Affiliation: | (1) Department of Pure and Applied Ecology, Section Population Biology, University of Amsterdam, Kruislaan 320, 1098 SM Amsterdam, The Netherlands;(2) Biological Control Programme, International Institute of Tropical Agriculture, BP 08-0932, Contonou, Republic of Benin;(3) CNPMA/EMBRAPA, 13820 Jaguariúna, SP, Brazil |
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Abstract: | The survival of Neozygites cf. floridana (Weiser and Muma) as dry hyphal bodies in mummified cassava green mites, Mononychellus tanajoa (Bondar), at 5.0% RH in the dark was affected by storage temperature. Survival of the fungus in mummies kept at 24±1.0°C could be demonstrated for 6–7 months. When stored at 4°C, the fungus sporulated from 90% of the mummies liberating an average of 186.9 primary conidia per mummy even after a storage period of 16 months, when the experiment was terminated. The temperature, humidity and light condition significantly affected the viability of primary conidia. The percent viability across all factors dropped from 98.4% after 0 h (beginning of the experiment) to 23.4% after a 1 h exposure to the conditions tested. Lower temperatures maintained higher viabilities with 86.3% of the conidia surviving after 18 h at 18°C, whereas almost all conidia died after 12 h at 33°C. Conidia survived less than 1 h when exposed to SDs (saturation deficit) of 2.0 mm Hg or higher at any tested temperature. |
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Keywords: | Neozygites cf. floridana Mononychellus tanajoa mummy survival primary conidia germination viability temperature humidity saturation deficit light condition |
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