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Open AccessArticle

Ιnteractions between Beauveria bassiana and Isaria fumosorosea and Their Hosts Sitophilus granarius (L.) and Sitophilus oryzae (L.) (Coleoptera: Curculionidae)

1
Department of Pharmacy, School of Health Sciences, University of Patras, 26504 Patras, Greece
2
Department of Agricultural Technology, Technological Institute of Western Greece, 27200 Amaliada, Greece
3
ELGO-Demeter, Plant Protection Division of Patras, NEO & L. Amerikis, 26442 Patras, Greece
4
Department of Agriculture and Agrotechnology, University of Thessaly, 45100 Larissa, Greece
*
Author to whom correspondence should be addressed.
Insects 2019, 10(10), 362; https://doi.org/10.3390/insects10100362
Received: 4 September 2019 / Revised: 13 October 2019 / Accepted: 17 October 2019 / Published: 19 October 2019
The interactions between the entomopathogenic fungus Beauveria bassiana Balsamo (Vuillemin) (Hypocreales: Cordycipitaceae) and the entomopathogenic fungus Isaria fumosorosea (Wize) Brown and Smith (Hypocreales: Clavicipitaceae) were examined on young adults of Sitophilus granarius (L.) (Coleoptera: Curculionidae) and S. oryzae (L.) (Coleoptera: Curculionidae). Conidial suspensions of these entomopathogenic fungi were applied both separately and in combination, at three dosages, 104, 106, and 108 conidia/mL. Mortality of experimental adults was recorded daily for 15 days. An overall positive interaction between the pathogenic microorganisms was observed. Mean weevil mortality caused by the separate acting fungi, B. bassiana, ranged from 26.7% to 53.3% and from 36.6% to 63.3% for S. granarius and S. oryzae, respectively. The respective values for I. fumosorosea were 20.0%–53.3% and 46.7%–66.7%. The combined treatments showed a distinct interaction between the pathogens; for S. granarius, the interaction between the pathogens was additive in all combinations, whereas, for S. oryzae, the interaction was additive in seven and competitive in two of the combinations. Applying both entomopathogenic microorganisms may offer a method for weevil control that could be more effective than using each pathogen alone. View Full-Text
Keywords: interaction; Beauveria bassiana; Isaria fumosorosea; Sitophilus granarius; Sitophilus oryzae interaction; Beauveria bassiana; Isaria fumosorosea; Sitophilus granarius; Sitophilus oryzae
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Mantzoukas, S.; Zikou, A.; Triantafillou, V.; Lagogiannis, I.; Eliopoulos, P.A. Ιnteractions between Beauveria bassiana and Isaria fumosorosea and Their Hosts Sitophilus granarius (L.) and Sitophilus oryzae (L.) (Coleoptera: Curculionidae). Insects 2019, 10, 362.

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