Maize weevil - Sitophilus zeamais

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PaDIL - Plant Biosecurity Toolboxhttp://www.padil.gov.au/pbt | Maize weevil - Sitophilus zeamaisFigure 3. Sitophilus zeamais infesting maize cobs. Image: University of Georgia Archive, University ofGeorgia, Bugwood.org http://www.forestryimages.org/browse/detail.cfm?imgnum=1673036Figure 4. Maize cobs infested with Sitophilus zeamais. Image: Frank Peairs, Colorado State University,United States http://www.forestryimages.org/browse/detail.cfm?imgnum=1481061Sites of Infection/InfestationCommonly associated with corn and rice in warm humid areas, and also in tropical standing crops (Figs.1, 2, 3, 4). It has been found to attack fruit, such as apples, in storage. S. zeamais is a major pest of storedrice, but is of less importance in wheat. They cannot breed in finely processed grain but will readily breedin manufactured flour products such as macaroni and noodles, and also in milled cereals that have becomecaked from excess moisture.Last Updated: 27 November 2009 | PDF Made Date: 18 March 2012 | page 8 / 19
PaDIL - Plant Biosecurity Toolboxhttp://www.padil.gov.au/pbt | Maize weevil - Sitophilus zeamaisIdentificationMorphological MethodsEgg: no useful info yetLarvae: Soft, white and legless.Pupae: Naked and white.Figure 5. Sitophilus spp. pupa developing inside grain. Image: US Department of Agriculture,Agricultural Research Services.Last Updated: 27 November 2009 | PDF Made Date: 18 March 2012 | page 9 / 19
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Maize weevil - Sitophilus zeamais

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