Maize weevil - Sitophilus zeamais

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PaDIL - Plant Biosecurity Toolboxhttp://www.padil.gov.au/pbt | Maize weevil - Sitophilus zeamaisRajendran, S. 2005. Detection of insect infestation in stored foods. Advances in Food and NutritionResearch, 49: 163-232.Symptom DescriptionS. zeamais feed on individual grains, leaving only the hulls, and a severe infestation can reduce storedgrain to a mass of hulls and flour-like, powdery frass. Infested grains exhibit holes where adults haveemerged. Grain which floats on the surface of water often indicates larval damage inside the kernel.Infested grain will usually be found heating at the surface, and it may be damp, sometimes to such anextent that sprouting occurs.The egg, larvae and pupae stages occur inside the grain, and they are rarely seen outside of the grain. Thelarval stages feed on the internal portions of whole grains, making early detection of infestations difficult.This not only reduces the quality of the grain but also produces large amounts of heat and grain dust andfrass (Longstaff 1981, Lyon, undated).Symptom ImagesFigure 1. Adult Sitophilus zeamais on maize grain. Image: United States Department of Agriculture,Agricultural Research Service. http://www.ars.usda.gov/is/graphics/photos/aug00/k8854-1i.jpgLast Updated: 27 November 2009 | PDF Made Date: 18 March 2012 | page 6 / 19
PaDIL - Plant Biosecurity Toolboxhttp://www.padil.gov.au/pbt | Maize weevil - Sitophilus zeamaisFigure 2. Newly emerged Sitophilus zeamais adults on maize seed, showing emergence holes. Image:Canadian Grain Commission. http://www.grainscanada.gc.ca/storage-entrepose/pip-irp/mw-cr-eng.htmLast Updated: 27 November 2009 | PDF Made Date: 18 March 2012 | page 7 / 19
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Maize weevil - Sitophilus zeamais

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