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Adult wheat weevils are about 3–5 mm (0.12–0.20 in) long with elongated snouts and chewing mouth parts. [2] Depending on the grain kernels, the size of the weevil varies. In small grains, such as millet or grain sorghum, they are small in size, but are larger in maize (corn). [3] The adults are a reddish-brown colour and lack distinguishing ...
The sole species, Rhyzopertha dominica, is known commonly as the lesser grain borer, American wheat weevil, Australian wheat weevil, and stored grain borer. [3] It is a beetle commonly found within store bought products and pest of stored cereal grains located worldwide. [4] It is also a major pest of peanuts.
The maize weevil and the rice weevil look very much alike but external features can be used to differentiate the vast majority of adults. However, the only reliable features to distinguish adults of both species are the genitalia (see table below). Both species can hybridize. The genitalic structure of hybrids is unknown. [9] [10] [8] [7]
Weevils also are known to infest oats, rice, corn, corn meal, sorghum, and cereal, so you might want to apply the same practice you do to your flour as those items as well.
An adult emerges from inside a grain of rice. 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 ...
However, other Ahasverus species look very similar and particular confusion can occur with Ahasverus rectus, which is also found in grain bins in North America. The larvae are worm-like, cream-colored and often reach a length of 3 mm before pupating into darker adults. Males and females are identical in appearance both as larvae and adults.
Adult Curculionidae can be recognised by the well-developed, downwards-curved snout possessed by many species, though the rostrum is sometimes short (e.g. Entiminae). [ 3 ] [ 4 ] They have elbowed antennae that end in clubs, and the first antennal segment often fits into a groove in the side of the rostrum.
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