Distribution of the related weevil species Sitophilus oryzae and S. zeamais (Coleoptera: Curculionidae) in farmer stored grains of China. The pupa undergoes major internal and external changes inside the grain to develop into an adult. enable_page_level_ads: true Plagiarism Prevention 4. Sometimes, they are also found infesting beans, sunflower seeds and dried corn. There is generally no external evidence that the larvae have been eating until when the adult weevil chews through the seed coat and emerges. The pupa goes through great changes both internally and externally. The eggs hatch in 3 days. During its life span of 5 months, it lays a total of about 250-400 eggs. The adult rice weevil is reddish-brown in color. Disclaimer 9. Behavioral responses to food volatiles by two species of stored-product Coleoptera, Sitophilus oryzae (Curculionidae) and Tribolium castaneum (Tenebrionidae). The larva eats the grain empty and pupates inside the shell of the grain. Rice weevils are good flier as it has been known to fly from go down to the nearby fields, where it infests the ripe grains. The pronotum is barely shorter than the elytra. The maize weevil is typically somewhat larger than the rice weevil, but rice weevils as large as the largest maize weevils and maize weevils nearly as small as the smallest rice weevils have been found. Inside the grain kernel, the egg hatches into a young larva which migrates toward the centre of the grain kernel. Before pupation it may pass through pre-pupal stage for 1-2 days. It is easily confused with the similar looking maize weevil. Larger and healthier grains produce larger and healthier weevils. The adults are usually between 3 and 4.6 mm long, with a long snout. Pupa: The pupa stage lasts for 6 days. Sorghum In Maharashtra, India, some hybrids and varieties of sorghum were less susceptible to attack by S. oryzae than local varieties (Borikar and Tayde, 1979). Rice weevils are the most destructive pests of stored grain and they completely destroy the grain. Adults move and penetrate deeply into bulk of grains and get widely distributed. The adult emerges out through the hole of emergence. These insects are cosmopolitan in distribution and have originated in Far East region. These insects are cosmopolitan in distribution and have originated in Far East region. After copulation, adult female bores a hole in the grain with the help of its powerful jaws and deposit a single egg in the grain cavity. Distribution: It is a serious pest not only of paddy and rice but almost of all cereals and their products. Copyright 10. Females drill a tiny hole in the grain kernel through whic it deposits its egg and then plugs the hole with a gelatinous substance. Genus – Sitophilus . Treatment: Controlled Atmosphere for infestation in product In fact, it is the commonest pest that one encounters in all kinds of stores. Commodities infested: Cereal grains and solid cereal products e.g. Preventive measures include: cool and dry storage areas, clean empty spaces. Identification: Adults are 3 – 4 mm, dark brown to black, and the elytra each have two dull orange spots, while flight wings (under elytra) are present, the thorax has circular shaped punctures, and the club-shaped antennae are kinked halfway. The life span of the adult weevil is 4-5 months. Tropical warehouse moth (Ephestia cautella), Sawtoothed grain beetle (Oryzaephilus surinamensis), Rust red flour beetle (Tribolium castaneum), Mediterranean flour moth (Ephestia kuehniella), Lesser grain borer (Rhyzopertha dominica), Larger grain borer (Prostephanus truncatus), Confused flour beetle (Tribolium confusum), Coffee bean beetle (Areacerus fasciculatus), Broad horned flour beetle (Gnatocerus cornutus). Distribution: Worldwide. Adult: Adults are between 0.1 and 1.7 cm long. If large numbers of rice weevils increase the temperature of the stock by breeding in the excrement, this may cause mold. This pest is particularly called as “rice weevil” because it’s breeding habits and life cycle was first of all studied in rice. Image Guidelines 5. 111 (3), 1461-1468. Some external features can be used to differentiate … Egg: Rice weevil lays its eggs in crevices of kernels or dust. These insects do not bite nor damage wood. Content Guidelines 2. The pupa does not feed. Females are larger than males. Sitophilus Oryzae is usually found in grain storages and processing plants. Rice weevils pretend death by drawing their legs close to body and remaining silent even when disturbed. * Head includes the mouth parts and sense organs, * Abdomen contains the reproductive organs. Similar species: Sitophilus granaries and Sitophilus zeamais. Sitophilus Oryzae is also called as Rice weevils. Weevils have chewing type of mouthparts.


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