Evaluation of the Entomopathogenic Potential of Beauveria bassiana, Metarhizium anisopliae and Isaria fumosorosea for Management of Cosmopolites sordidus Germar (Coleoptera: Curculionidae)

James Kisaakye, Hendrika Fourie, Danny Coyne, Laura Cortada, Shirlyne Masinde, Sevgan Subramanian and Solveig Haukeland
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James Kisaakye: Plant Health Theme, International Centre of Insect Physiology and Ecology (icipe), P.O. Box 30772, Nairobi 00100, Kenya
Hendrika Fourie: Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa
Danny Coyne: icipe Campus, International Institute of Tropical Agriculture (IITA), P.O. Box 30772, Nairobi 00100, Kenya
Laura Cortada: icipe Campus, International Institute of Tropical Agriculture (IITA), P.O. Box 30772, Nairobi 00100, Kenya
Shirlyne Masinde: Plant Health Theme, International Centre of Insect Physiology and Ecology (icipe), P.O. Box 30772, Nairobi 00100, Kenya
Sevgan Subramanian: Plant Health Theme, International Centre of Insect Physiology and Ecology (icipe), P.O. Box 30772, Nairobi 00100, Kenya
Solveig Haukeland: Plant Health Theme, International Centre of Insect Physiology and Ecology (icipe), P.O. Box 30772, Nairobi 00100, Kenya

Agriculture, 2021, vol. 11, issue 12, 1-16

Abstract: The banana weevil (BW), Cosmopolites sordidus , is the main coleopteran pest of banana, causing up to 100% yield loss. In this study, we screened 20 isolates of entomopathogenic fungi (EPF) for the management of BW. In the lab, eight Beauveria bassiana isolates caused >50% mortality of the adult BW, whereas Metarhizium anisopliae and Isaria fumosorosea isolates were less pathogenic. B. bassiana isolates ICIPE 648, ICIPE 660 and ICIPE 273 were the most pathogenic, killing ≥80% of adult BW. B. bassiana isolate ICIPE 622 yielded the highest spores per BW cadaver (1.84 × 10 8 spores), followed by ICIPE 660, ICIPE 273 and ICIPE 648—1.17 × 10 8 , 3.8 × 10 7 and 3.6 × 10 7 spores, respectively. ICIPE 273 had the shortest LT 50 (5.3 days) followed by ICIPE 648 (9.8 days) and 660 (11.1 days). Similarly, the LC 50 values for the three isolates were 5.18 × 10 7 , 5.49 × 10 7 and 5.2 × 10 7 spores mL −1 , respectively. In the field, ICIPE 273 and ICIPE 648 had the highest (31.3%) and lowest (20.8%) pathogenicity, respectively. This study indicates that the B. bassiana isolates ICIPE 273, ICIPE 648 and ICIPE 660 are potential candidates for the environmentally sustainable management of BW.

Keywords: banana weevil; spore production; pathogenicity; biological control; banana (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
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