Many orders have separate sections about the life cycle of the insect as well as its habitat requirements, and fossil history. However, on average, larvae emerge within three days and develop into pupae within 18. Adults emerge in July to August when outdoors, if indoors they emerge any time. Once the eggs hatch, weevil larvae feed voraciously on whatever plant-based food source is nearby. Larvae pupate in late summer or fall. Life Cycle. Hatching weevil Jonathan Lewis / Getty Images Stored Food Pest Damage . Hatching takes about 2-3 weeks. Life Cycle: Their life cycle takes 1 â 2 years outdoors and 8 â 10 months indoors. Female boll weevils can deposit between 100 to 300 eggs into cotton buds and/or fruit, but will not lay eggs in areas where other females have deposited their eggs, unless the majority of cotton bolls are infested. Life Cycle of Weevils and Flour Beetles Weevils Sitophilus granarius is a small (3-5mm) browny/black or dark grey-coloured insect. Mated females chew a hole in the pecan shell and deposit eggs inside. About the Alfalfa Weevil. Laying their, white, elongated with tail, eggs inside open vessels. Boll Weevil Reproduction and Life Cycle. Life History. Six days afterwards, adults emerge from the husk. Life Cycle: Adult weevils and full grown larvae spend the winter in cells, 4 to 12 inches deep in the soil. Signs of a Rice Weevil It is sometimes known as the snout beetle, the true weevil of the Coleoptera order (beetles and weevils). It is quite likely that at any given point in time during the summer, most, if not all, alfalfa weevil life stages can be found. The alfalfa weevil overwinters as an adult in leaf debris and soil where alfalfa is grown. Adult weevils become active in August and early September. Adult weevils are small, 1/4-inch, brownish-grey snout beetles, with a darker brown band down the back. The females deposit about ⦠Older adult weevils may continue their egg-laying activities, while at the same time, larvae, cocoons, and newly emerged adults may also be observed. After some time, weevils morph into sexually mature adults with hard outer shells. The Grain weevils prefer to breed only in conditions where the moisture content exceeds 9.5% and where the temperature ranges between 13 to 35 o C. Corresponding to the humidity and temperature, the female lays 2 to 3 eggs a day, totaling around 200 eggs. Life Cycle. Female weevils can lay over 150 eggs in their lifetimes. Adults may live as long as six months. Larvae are generally lighter in colour and appear as small, fleshy, maggot-like creatures. G ranary weevil or grain weevil , Sitophilus granarius The Granary weevil or grain weevil, Sitophilus granarius is a pest of stored grain, and its body length is 2.3 - 3.5 mm. Another weevil that can be confused with the alfalfa weevil is the clover root curculio or Sitona weevil. The alfalfa weevil spends the winter as an adult in the crowns of the alfalfa plant or under leaves or other debris. Life-Cycle. The female lays about 200 eggs at a rate of 2-3 per day depending upon temperature and humidity, placing each one in a small hole bored in the grain and sealing it in with a mucilaginous plug of saliva. They will surface early in the spring, usually once temperatures are 60 degrees Fahrenheit or higher and will immediately begin feeding off of the alfalfa leaves. LIFE-CYCLE: The Grain weevil can only breed in grain with a moisture content of more than 9.5% and at temperatures within the range 13-35°C. In colder temperatures, the development cycle of the rice weevil may span more than 32 days. Reproduction and Life Cycle. Partly because of its long life and partly because of its ability to fly, the rice weevil is considered to be the most destructive, but all three weevils can cause extensive damage to stored foods. 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