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It then pupates within the grain kernel and emerges 2–4 days after eclosion. Male S. oryzae produce an aggregation pheromone called sitophilure ((4S,5R)-5-Hydroxy-4-methylheptan-3-one) to which males and females are drawn. A synthetic version is available which attracts rice weevils, maize weevils and grain weevils.
Rice water weevils go through 1 generation in Japan and California, but in parts of southern China and the southern US they will undergo up to 3-4 generations per year. The adults feed on leaves and the sheath leaving diagnostic feeding scars which can help gauge the severity of an infestation. the adults will lay eggs beginning in March ...
Notable pest species include the rice weevil (S. oryzae), wheat weevil (S. granarius), and maize weevil (S. zeamais). Among the Stiophilus are species which destroy stored wheat , rice , sorghum , [ 2 ] [ 3 ] [ 4 ] oats , barley , rye , buckwheat , [ 4 ] peas , cottonseed , processed cereal products such as pasta , cassava , [ 3 ] and fruits ...
A storage pest is an insect or other animal that damages or destroys stored food or other stored valuable organic matter. [1] Insects are a large proportion of storage pests with each type of crop having specific insects that gravitate towards them such as the genus Tribolium that consists of insects such as Tribolium castaneum (red flour beetle) or Tribolium confusum (confused flour beetle ...
The maize weevil (Sitophilus zeamais), known in the United States as the greater rice weevil, [1] [2] is a species of beetle in the family Curculionidae. It can be found in numerous tropical areas around the world, and in the United States, and is a major pest of maize . [ 3 ]
Rice_weevil_side_view.JPG (768 × 371 pixels, file size: 185 KB, MIME type: image/jpeg) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
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.
The weevils are hard to detect and usually all of the grain in an infested storage facility must be destroyed. Many methods have been attempted to get rid of the wheat weevil, such as pesticides, different methods of masking the odor of the grain with unpleasant scents, and some have even gone as far as introducing predator organisms.