• The toxicity of Metarhizium anisopliae were estimated on Rhynchophorus ferrugineus . • The biological parameters of grubs were assessed by age-stage, two-sex life table. • R. ferrugineus grubs had 1.2 × 10 6 spores/mL LC 50 values of M. anisopliae. • M. anisopliae infected grubs had reduced ( R o ) , ( T ) and ( r ) values. • Adult longevity and fecundity were also reduced in infected grubs. Outbreaks of red palm weevil, Rhynchophorus ferrugineus Olivier, in Pakistan are considered a very serious threat to the date industry, owing to the sudden death of date palm trees. Current integrated management strategy largely depends on insecticides, with negative impacts on the environment. Integration of bio-control strategies incorporating entomopathogenic fungi (EPF) may provide an ecologically safe alternative. In the current study the effectiveness of Metarhizium anisopliae Sorokin against R. ferrugineus was investigated using the immersion method and the effects of this fungus on biological parameters of R. ferrugineus were estimated by age-stage, two-sex life table software. After treatment with M. anisopliae isolate (Ma-M 2 ), lethal concentration (LC 50 ) 1.2 × 10 6 spores/mL was determined against R. ferrugineus 3rd instar grubs. M. anisopliae infected grubs showed reduced net reproductive rate R o (75.55) and mean generation time T (113.886 days) and intrinsic rate of increase r (0.03797) compared to the untreated group. Also, adult longevity of males and females were significantly reduced in the M. anisopliae -infected group (F 1 ) as compared to the untreated group. Trans-generational studies revealed that grubs stage duration (69.34 days) and fecundity (181.32 eggs) of the M. anisopliae -infected group (F 1 ) were decreased compared to the untreated group. The use of lasting and adverse effects on the biological parameters of R. ferrugineus , indicate that treatment with EPF may provide an eco-friendly management strategy for this pest.