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The flat mite, Brevipalpus phoenicis (Geijkes), is a polyphagous pest found in many subtropical and tropical regions of the world (Childers et al. 2003). Brevipalpus phoenicis is recognized as the most economically harmful virus vector species in citrus areas where Citrus leprosis Virus (CiLV) has been reported. So far, chemical sprays have been the main approach adopted to control the mite in citrus (Rodrigues & Machado 2003). Otherwise, fungal pathogens are frequently found causing diseases and epizootics in mite populations (Alves 1998; Van Der Geest et al. 2000). Recently, the potential to control Brevipalpus populations by spraying with the fungus Hirsutella thompsonii Fisher was suggested (Rosas-Acevedo & Sampedro 2000; Rossi 2002). However, the development of H. thompsonii as a bio-acaricide has been hampered by difficulties in mass producing aerial conidia. In contrast, the entomopathogenic fungus Metarhizium anisopliae var. acridum Driver & Milner is easily produced in large scale and has been developed as a mycoinsecticide in several countries (Magalhaes et al. 2000; Lomer et al. 2001). This fungus is tolerant of high temperatures, an important characteristic for pathogens developed for tropical agroecosystems. We studied the pathogenicity of M. anisopliae var. acridum against B. phoenicis to evaluate its potential use as an acaricide. Mites used in this study were 5-15 days old adult females derived from clonal lineage established from a single female isolated from a mite colony collected from citrus in Plant City, Florida (Rodrigues et al. 2004). The fungus assayed was the isolate CG423 of M. anisopliae var. acridum , produced on SDAY medium, harvested, and dried according to Magalhaes & Boucias (2004). The viability of the conidia used in the bioassays was determined by plate assay to be >95%. The bioassay unit was a 90-mm diameter Petri dish containing a 60-mm diameter plate glued to the bottom. A 1.5-cm diameter circular leaf arena clipped from Ligustrum lucidum Aiton was placed over a layer of cotton wool which was saturated with water. Twenty mites were transferred to the leaf arena. Two h later the pathogen was applied at a concentration of 10 8

PATHOGENICITY OF METARHIZIUM ANISOPLIAE VAR. ACRIDUM TO THE FALSE SPIDER MITE BREVIPALPUS PHOENICIS (ACARI: TENUIPALPIDAE)