Powder and 3 solvent crude extracts obtained from dry ground leaves of Eichhornia crassipes (Mart) Solm. (Pontederaceae) using acetone, methanol and petroleum ether were evaluated under laboratory conditions (30 ±1°C, 65±5% rh) for their bioinsecticidal activity against two strains (laboratory and resistant) of Triboleum castaneum (Herbst.), Sitophilus oryzae (L.) and Callosobruchus maculatus (F.). All levels of the dry ground leaf  concentrations inhibited F₁ progeny production and adult emergence of the tested insects. The dosage of 1% of petroleum ether extract killed 100% of S. oryze and C. maculatus after 9 days of application, while caused 26% mortality of T. castaneum at the same exposure time. Also, all levels of tested extracts have deterioration effect on biology of both S. oryzae and C. maculatus. C. maculatus adults were more tolerant than other tested insects at 2 days posttreatment with LC₅₀ of 345.97 mg/cm² except for T. castaneum (RS) which had LC₅₀ of 503.22 mg/cm², however it exhibited no resistance to petroleum ether extract. Acetone and methanolic extracts exhibited low toxicity against the tested insects.