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Selection of Metarhizium Anisopliae (Metsch.) Sorok. (Deuteromycotina: Hyphomycetes) isolates for the control of Mahanarva fimbriolata (Stal, 1854) (Hemiptera: Cercopidae) in sugarcane

The objective of this research was to select isolates of Metarhizium anisopliae (Metsch.) Sorok. Deuteromycotina: Hyphomycetes) pathogenic to the froghopper Mahanarva fimbriolata (Stal, 1854) (Hemiptera: Cercopidae). The study was carried out in laboratory conditions, using specimens of the froghopper nymphs that, after being carefully separated for size in groups of 10 individuals, were inoculated with a suspension of conidia containing 1.0 x 10(7); 05 x 10(8); 1.0 x 10(8); 0.5 x 10(9) and 1.0 x 10(9) conidia/mL for isolate IBCB 425 (standard) of the fungus, and then kept in an incubator at 25 ± 1º C, RH 70 ± 10 and 12h photophase. The total mortality, mortality corrected by Abbott's formula and confirmed mortality were determined. It was observed that the concentration of 1.0 x 10(9) conidia/mL showed the greatest effect on M. fimbriolata, presenting the shortest TL50 (2.75 days). Among the isolates of M. anisopliae evaluated, 7 (UFGD 425, UFGD 22, PL 43, IBCB 348, UFGD 28, UFGD 05 and UFGD 03) caused confirmed mortality of at least 70.0% of the population of nymphs after the 7th day after inoculation, showing potential as control agents of the sugarcane root froghopper.

Biological control; microbial control; froghopper; pathogenicity; Saccharum spp


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