Effects of Fluctuating Moisture and Temperature Regimes on Sporulation of Beauveria bassiana on Cadavers of Rhodnius prolixus |
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Authors: | Jacques Fargues Christian Luz |
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Institution: | 1. INRA -Montpellier , Uni[tacute]e de Recherche en Lutte Biologique , Campus International de Baillarguet, Mont ferrier-sur-Lez, F-34982, France;2. INRA -Montpellier , Uni[tacute]e de Recherche en Lutte Biologique , Campus International de Baillarguet, Mont ferrier-sur-Lez, F-34982, France;3. Institute of Tropical Pathology and Public Health , Federal University of Goias , CP131, Goiania, 74001-970, GO, Brazil |
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Abstract: | The effects of both moisture and temperature on the sporulation of an isolate of Beauveria bassiana , highly virulent to the Chagas' disease vector, Rhodnius prolixus , were studied in the laboratory under fluctuating regimes. Quantitative assays for conidial production from funguskilled cadavers from 10-day-old tests showed that recycling was highly dependent on the duration of exposure to high relative humidity (RH). On first-instar larval cadavers, sporulation reached more than 10 5 conidia/nymph under most regimes with a favourable phase combining high humidity (97% RH) and temperatures of 20 or 25 C for at least 12 h/day. Sporulation on third- and fifth-instar nymphs required a longer period (16 h/day or more) of favourable conditions (97% RH and 25 C) per day. The intensity of the conidial production from Rhodnius cadavers was enhanced when diurnal temperatures were high (28 and 35 C). From a vector control standpoint, daily high humidity requirements appear to be a crucial constraint. The recycling ability of B. bassiana on fungus-killed R. prolixus is most likely to contribute to the regulation of this triatomine vector if applications are made during the rainy seasons and in the most favourable habitats. |
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Keywords: | Entomopathogenic Fungi Beauveria Bassiana Sporulation Cadaver Rhodnius Prolixus Temperature Humidity Fluctuating Regimes Host Stage |
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