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- Title
Susceptibility of Duponchelia fovealis Zeller (Lepidoptera: Crambidae) to Soil-Borne Entomopathogenic Fungi.
- Authors
Amatuzzi, Rafaela F.; Poitevin, Carolina G.; Poltronieri, Alex S.; Zawadneak, Maria A. C.; Pimentel, Ida C.
- Abstract
<italic>Duponchelia fovealis</italic> (Lepidoptera: Crambidae) is an invasive species that has had a large impact on strawberry crops in Brazil. Pesticides have had limited effectiveness and the use of biological control agents to improve its management is the most appropriate approach. The aim of this study was to evaluate the pathogenicity and virulence of entomopathogenic fungi—isolated from soil—against <italic>Duponchelia fovealis</italic> larvae under laboratory and greenhouse conditions. Pathogenicity screenings were performed for twenty isolates from <italic>Beauveria bassiana</italic>, <italic>Beauveria caledonica</italic>, <italic>Isaria javanica</italic>, <italic>Metarhizium anisopliae</italic>, and <italic>Lecanicillium</italic> sp. against third instar larvae of <italic>D. fovealis</italic> at the concentration of 109 conidia·mL−1. Lethal concentration (LC50) and lethal time (LT50) were determined for the most pathogenic isolates and for one commercial mycoinsecticide. Mortality rates varied from 10 to 89%. The isolates <italic>B. bassiana</italic> Bea1, Bea110, Bea111 and <italic>I. javanica</italic> Isa340 were the most pathogenic. The most virulent isolates were <italic>B. bassiana</italic> Bea111 and <italic>I. javanica</italic> Isa340 with LC50 values of 2.33 × 106 and 9.69 × 105 conidia·mL−1, respectively. Under greenhouse conditions, the efficacy of LC50 of the isolates <italic>I. javanica</italic> Isa340 and <italic>B. bassiana</italic> Bea111 were 45% and 52%, respectively. Our results indicate that these isolates are strong candidates for application in the control of <italic>D. fovealis</italic>. This study is the first evaluation of soil-borne entomopathogenic fungi against <italic>D. fovealis</italic>.
- Subjects
STRAWBERRY diseases &; pests; LEPIDOPTERA; CRAMBIDAE; ENTOMOPATHOGENIC fungi; SOILBORNE plant pathogens
- Publication
Insects (2075-4450), 2018, Vol 9, Issue 2, p70
- ISSN
2075-4450
- Publication type
Article
- DOI
10.3390/insects9020070