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The wheat weevil (Sitophilus granarius), also known as the grain weevil or granary weevil, is an insect that feeds on cereal grains, and is a common pest in many places. It can cause significant damage to harvested stored grains and may drastically decrease crop yields. The females lay many eggs and the larvae eat the inside of the grain kernels.
Adult rice weevils are able to fly, [6] and can live for up to two years. Females lay 2–6 eggs per day and up to 300 over their lifetime. 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 adults lack functional wings and do not fly. There are no males, and reproduction is asexual. Eggs are laid at random in the soil in summer around food plants, and, on hatching, the larvae feed on the roots until late fall, when they hibernate. Strawberry root weevils reproduce through a process called parthenogenesis. This means that ...
Most weevils have the ability to fly (including pest species such as the rice weevil), [2] [3] though a significant number are flightless, such as the genus Otiorhynchus, and others can jump. One species of weevil, Austroplatypus incompertus, exhibits eusociality, one of the few insects outside the Hymenoptera and the Isoptera to do so ...
Curculio glandium eggs are deposited in acorns by the adult weevil chewing channels into the fruit. The eggs are then released using an ovipositor, a long, narrow organ featured in female weevils. [2] These do not reach the acorn's embryo and are healed by the plant, sealing the holes and protecting the eggs from parasites.
Female weevils have the ability to reproduce parthenogenetically [2] with fertilisation of eggs required to produce males, though no males have been observed. [3] This form of parthenogenesis is known as thelytoky. Grubs grow up to 1 cm in length, have a slightly curved, legless body and are creamy white in colour with a tan-brown head.
In addition, deodar weevils can vector pitch canker (Fusarium moniliforme) The weevils are active all winter long and lay one to four or five eggs in the inner bark in holes chewed through the bark, but fall is the peak time for adult feeding and breeding. The weevils do some minor damage as they feed on the bark before laying their eggs.
Severe damage to white spruce and white pine can be created by the white pine weevil. [7] Damage is caused due to reproduction of white pine weevils in host trees. [8] When white pine weevils lay eggs they typically do so on the apical shoot. [8] In around a week, or seven days, larvae will hatch from the eggs. [4]