The snout is long (1 mm), almost 1/3 of the total length. Asia, Africa, North, Central and South America, the Caribbean, Europe, Oceania. Bionomics Larva is whitish with a light-brown head. The duration of life cycle of rice weevil and number of generations completed in a year depends upon the weather conditions, like temperature and humidity. Among the different physical characteristics evaluated, significant and negative correlation of 100 seed weight was observed with weevil emergence (r = − 0.53) and susceptibility index (r = − 0.51). Females lay 2-6 eggs per day and up to 300 over their lifetime. Distribution: It is not exactly known where the weevil originated, though it may have been from the Middle East. Sitophilus oryzae is supposed to be a native of India, although few are of the opinion that some temperate country is its original home. It is widespread in the southern United States. Rishikesh GDR, Haque MA, Islam MAU, Rahman MM, Banu MR: In-vitro insecticidal activity of crude extracts of Streptomyces sp. Introduction. Larvae feed inside the grain, and pupate there. Adults - Also feed; cannot normally overwinter in temperate areas unless grain heats. In continuing your browsing of this site, you accept the use of cookies to offer you suitable content and services and realize visits statistics. They can exist anywhere where physical conditions for growth are favourable and the grain is left undisturbed for some time. Inhibitory Effect of Buprofezin on the Progeny of Rice Weevil, Sitophilus oryzae L. (Coleoptera: Curculionidae) Gopal Das* Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh Abstract If you want to view as pdf, click here. Feeble sexual dimorphism exists. Notable species include the rice weevil ( S. oryzae ), wheat weevil ( S. granarius ), and maize weevil ( S. zeamais ). Some Micro-organisms Associated with the Weevils Sitophilus granarius (L) and Sitophilus oryza (L). The most significant identification feature of weevils is their snout, which is pretty long. Biology: Eggs - Laid in stored cereal grains and in cereals in the field by flying adults (more prolific than granary weevil). The female uses strong mandibles to chew a hole into a grain kernel after which she deposits a single egg within the hole, sealing it with secretions from her ovipositor. The egg is oval in shape but they are elastic enough to fit in the hole made by the mother, who thereafter covers the egg with gelatinous fluid. Adults move and penetrate deeply into bulk of grains and get widely distributed. Privacy Policy 8. Host range Gram, mung (Phaseolus aureus), moth (Phaseolus aconitifolius), peas, cow peas, lentil and arhar (Cajanus cajan), cotton seed, sorghum and maize. Attack is evidenced by, //