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A B S T R A C T The tomato moth, Tuta absoluta Meyrick, is a serious pest on tomatoes (Lycopersicon esculentum L.) crops in Chile. Laboratory studies were conducted to evaluate the virulence and effectiveness of the isolates Metarhizium anisopliae var. anisopliae isolate QuM558 and Beauveria bassiana isolate Qu-B912, on third instar of T. absoluta larvae. The first evaluation was carried out spraying directly on third instar larvae spore suspensions, 0 to 10 8 conidia mL -1 , of each isolate through a Potter tower. Comparisons were made by calculating the area under a mortality progress curve. Differences were not observed in the areas between isolates (P = 0.384). The LC 50 and LC 90 for Qu-B912 were 10 4.4 and 10 7.6 conidia mL -1 , and for QuM558 were 10 5.4 and 10 9.1 conidia mL -1 , respectively. A second evaluation was carried out spraying on tomato leaves spore suspensions (0 to 10 8 conidia mL -1 ) of Qu-B912 isolate through a Potter tower. Third stage T. absoluta larvae were fed with these infected leaves. Thirteen days after inoculation doses of 10 8 conidias mL -1 caused 68% of larvae mortality.

Efectividad de Aislamientos de Hongos Entomopatógenos Sobre Larvas de Polilla del Tomate Tuta absoluta Meyrick (Lepidoptera: Gelechiidae)