It infests raw or processed cereals such as However, in most cases if it’s not fit for consumption the materials should be disposed of. In the home, control of these insects involves inspection and removal of infested food products, discarding the heavily infested material, re-packaging material in new containers, and vacuuming kitchen cabinets.
Both species can hybridize. Both adults and larvae feed on internally on maize grains and an infestation can start in the field (when the cob is still on the plant) but most damage occurs in storage. In larger infestations of stored grain warehouses and silos, remediation will require emptying the infested areas, cleaning and the use of residual insecticide.http://www.agrilifebookstore.org/Pantry-and-Fabric-Pests-in-the-Home-p/e-486.htmClick for a hub of Extension resources related to the current COVID-19 situation. Rice weevils and maize weevils are about 1/8 inch long and brown. Although not often found in the home, they are sometimes found infesting beans, birdseed, sunflower seeds, dried corn, and too a lesser degree macaroni and spaghetti.
Its larvae (soft, white grubs without legs) and white pupae are similar to those of the rice and maize weevil. They build up in numbers in stored grain.Females can lay 300 to 400 eggs typically one per cavity. Common Names
Rice and Maize weevils are widely distributed in tropical and sub-tropical areas and will be carried to temperate areas on imported commodities. MAIZE WEEVIL CONTROL IN THE GARDEN ^ If you’ve found maize weevils on your corn or other vegetables, apply MULTIPURPOSE INSECT KILLER directly to the affected crops.
The maize weevil (Sitophilus zeamais), known in the United States as the greater rice weevil, is a species of beetle in the family Curculionidae. They have densely spaced pits on the pronotum that are round (maize weevil) or elongated (rice weevil). Both adults and larvae are cold-hardy.
They may complete a generation in a month in warm conditions. They may also infest grain in the field. Holes in the side of the grain are made by adults and by the emerging adults.
However, the only reliable features to distinguish adults of both species are on the genitalia (see table below).
A very destructive weevil, with the adults attacking sound grain, and the adults and the larvae feeding inside them, leaving large cavities and emergence holes.
Inside warehouses they can fly great distances to infest food products.Rice and maize weevils are usually found in grain storage facilities or processing plants, infesting wheat, oats, rye, barley, rice, and corn.
Maize damaged by maize weevil larvae.
Early detection of infestation is difficult.
Infested grains contain holes through which adults have emerged. Larvae hollow out kernels of grain and usually attack whole kernels. Mating often occurs within 24 hours of adult emergence from grain kernels. Products that need to be retained may be placed in the freezer for several weeks to kill adults and larvae.
They have densely spaced pits on the pronotum that are round (maize weevil) or elongated (rice weevil).
As S. zeamais larvae feed on the interior of individual grains, often leaving only the hulls, a flour-like grain dust, mixed with frass is evident. Rice weevils and maize weevils are about 1/8 inch long and brown. This weevil cannot fly, so will be found close to the areas it infests. Mating often occurs within 24 hours of adult emergence from grain kernels. Adults often live for 7 to 8 months and some records are over 2 years.Monitoring using sticky traps, pitfall traps, or pheromone traps will help with proper identification.
The genitalic structure of hybrids is unknown.The complete development time for the life cycle of this species averages 36 days.When the adults emerge, the females move to a high surface and release sex The maize weevil commonly attacks standing crops, in particular, maize before harvest, and is also commonly associated with rice.
The maize weevil and the rice weevil look very much alike but external features can be used to differentiate the vast majority of adults.
This ability allows them to travel from field to storage facilities. Contest behaviour of maize weevil larvae when competing within seeds Nelsa Maria P. Guedesa,b, Raul Narciso C. Guedesa,b,*, James F. Campbellb,1, James E. Throneb,1 aDepartamento de Biologia Animal, Universidade Federal de Viçosa b USDA-ARS Grain Marketing and Production Research Center, Manhattan, Kansas article info Article history: Received 23 June 2009 Both are internal feeders, which means the larva develops inside whole grain kernels. this weevil has well developed wings and is considered a strong flier.
Larvae develop through several stages (instars) inside the grain kernels and also pupate inside the kernel. The maize weevil is found in all warm and tropical parts of the world.
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