Conidial suspensions ofBeauveria bassiana(Balsamo) Vuillemin,Metarhizium anisopliaevar.anisopliae(Metschnikoff) Sorokin,Metarhizium flavovirideGams and Rozsypal,Paecilomyces farinosus(Dickson ex Fries) Brown and Smith, andPaecilomyces fumosoroseus(Wize) Brown and Smith were tested in the laboratory for pathogenicity toOtiorhynchus sulcatusF. andSitona lineatusL. eggs and neonate larvae. All fungi tested, exceptB. bassiana, were infectious forO. sulcatuseggs.Metarhizium flavovirideoutperformed all other fungi and it was the only species effective againstSitona lineatus. The grubs ofO. sulcatusandS. lineatushatching from treated but apparently unaffected eggs were susceptible to all fungi tested and the overall cumulative mortality for eggs and grubs was high in both insect species.Metarhizium flavoviridewith a very low LD50(1 × 101spores ml−1) was also the fastest to attackO. sulcatus(LT50= 9.6 days at 108conidia ml−1). The lowest LD50forS. lineatuswas 4.2 × 102conidia ml−1withP. fumosoroseusandM. flavoviridewas the fastest acting fungus with a LT50= 6.9 days at 108conidia ml−1. INRA isolatesM. flavoviride88 andB. bassiana142 are promising candidates to control both weevil species.