Larvae develop through several stages (instars) inside the grain kernels and also pupate inside the kernel. A destructive weevil. Look for the adults, with long snouts (about 1 mm). It is a serious pests in stored grain especially corn and rice. this weevil has well developed wings and is considered a strong flier. Both are internal feeders, which means the larva develops inside whole grain kernels. Maize weevil, Sitophilus zeamais, clearly showing four light reddish to yellowish spots at the corners of the wing case. Rice weevils and maize weevils are about 1/8 inch long and brown. Click for a hub of Extension resources related to the current COVID-19 situation. Store small amounts of grain in plastic containers. The maize weevil ( Sitophilus zeamais) is a species of beetle in the family Curculionidae. It is recorded from Australia, Fiji1, New Caledonia, Papua New Guinea, Solomon Islands, and Tonga. Dry the grain as soon as possible after harvest, and re-dry during storage if necessary. Maize Weevil image provided by Pat Porter. A destructive weevil. Photos 1,2&4 Walker K (2006) rice weevil (Sitophilus zeamais) PaDIL - (https://www.padil.gov.au). Your email address will not be published. Android Edition Overall, control is similar to that recommended for the rice weevil (see Fact Sheet no. Scientific name: Atherigona orientalis. Chemical control: consult full fact sheet for details, and always check whether the product is for treating equipment, bins and buildings, or for treating grain for human use and animal feed. The larva like most weevil grubs are more or less “C-shaped”. In sub-tropical and tropical countries. Eggs laid into holes chewed in grain, and then plugged. ALWAYS CHECK WHETHER THE PRODUCT IS FOR TREATING EQUIPMENT, BINS AND BUILDINGS OR FOR TREATING GRAIN FOR HUMAN USE AND ANIMAL FEED. They have densely spaced pits on the pronotum that are round (maize weevil) or elongated (rice weevil). Rice weevils and maize weevils are about 1/8 inch long and brown. Common Name. Maize weevil, Sitophilus zeamais, clearly showing four light reddish to yellowish spots at the corners of the wing case. Maize weevil (rice weevil) Scientific name: Sitophilus zeamais (Coleoptera: Curculionidae) Facts: Maize weevil (rice weevil) is a small weevil only a few millimeters long. Photo 2  Georg Goergen, IITA-Benin. Mechanisms of resistance in maize grain to the maize weevil and the larger grain borer. Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community. They build up in numbers in stored grain. Rice (lesser grain) weevil (338) - Worldwide distribution. During large infestations, heat and moisture are produced, leading to colonisation by moulds and mites. 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. Sitophilus zeamais. Females lay up to 150 eggs placed in holes chewed into the grain and plugged with a gelatinous substance. Commonly, loss of weight is up to 5%, but severe infestations increase the losses up to 40%. Maize weevil, Sitophilus zeamais; another view of the four (very) faint, reddish spots at the corner of the wing case. Worldwide. http://www.agrilifebookstore.org/Pantry-and-Fabric-Pests-in-the-Home-p/e-486.htm, Filed Under: EntoExtension, Insect Tagged With: grain feeder, weevil. Holes in the side of the grain are made by adults and by the emerging adults. Facts: Maize weevil (rice weevil) is a small weevil only a few millimeters long. Monitoring using sticky traps, pitfall traps, or pheromone traps will help with proper identification. Products that need to be retained may be placed in the freezer for several weeks to kill adults and larvae. Eggs laid in holes chewed in grain, then plugged. On rice, maize, sorghum, wheat, cassava, and other stored products. Photo 1. For small infestations, freezing for several days and then heating for 24 hours is affective. It is a major pest of maize. Maize, rice, sorghum, wheat, casssava and yam, and also dried stored products, including pasta. These insects have chewing mouthparts. Characteristics: The flour weevils have forewings that have a leathery and hard configuration, uniting towards the dorsal surface mid line. 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. If using sacks, do not reuse those that stored previous harvests. The maize weevil has fully developed wings, and is a stronger flyer than the rice weevil, Sitophilus oryzae, and spreads more widely this way. Adults are 3-4 mm long, reddish-brown to black (Photos 1&2), with four light reddish to yellowish spots at the corners of the wing cases (Photo 3&4). Maize (greater grain) weevil (339) - Worldwide distribution. The boll weevil damaged cotton crops. Mating often occurs within 24 hours of adult emergence from grain kernels. The larva like most weevil grubs are more or less “C-shaped”. London; and CABI (2015) Sitotroga zeamais (greater grain weevil) Crop Protection Compendium (www.cabi.org/cpc); and from BioNET-EAFRINET Keys and Fact Sheets. Pest Profile Photo credit: by Jim Kalisch, University of Nebraska Common Name: Maize Weevil Scientific Name: Sitophilus zeamais Order and Family: Coleoptera: Curculionidae Size and Appearance: The Maize weevil is roughly 3-3.5 mm in length, has dark brown to black coloration, and has several pits arranged in lines along elytra. In sub-tropical and tropical countries. 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. Adults often live for 7 to 8 months and some records are over 2 years. (http://keys.lucidcentral.org/keys/v3/eafrinet/maize_pests/key/maize_pests/Media/Html/Sitophilus_zeamais_Motschulsky_1855_-_Maize_Weevil.htm). Malathion: i) as a spray; treat grain and do not use for food within 90 days of treatment; ii) as a dust; treat grain and do not use for food within 14 days of treatment. Moisture levels should be about 12% (most stored product pests required moisture levels of 13-18% to reproduce). Her Majesty's Stationery Office. Keep grain storage rooms, sheds, houses, or "cribs" clean. If using bins, remove any grains that remain (and, if possible, spray with insecticide). Damage symptoms. Scientific name: Sitophilus granarius Family: Curculionidae Description There are 3 different species: Sitophilus granarius (Grain Weevil) Sitophilus oryzae (Rice weevil) Sitophilus zeamais (Maize Weevil) Each of these species varies considerably in size but has a distinctive elongated snout which is adapted to the size of its preferred grain. The maize grains, or 'kernels', are encased in husks and total 30–1000 per ear. Maize is an annual plant, surviving for only one growing season and can reach 2–3 m (7–10 ft) in height. They may also infest grain in the field. Scientific name: Hieroglyphus nigrorepletus, Your email address will not be published. Photo 3. Larvae feed inside the grain, and pupate there. Worldwide. These weevils do not bite, nor do they damage wood or furniture. This organic concentrate is fast acting and safe enough to use on corn, tomatoes and more with just one day to harvest. For small amounts, store maize, rice, wheat, etc., in plastic containers. CABI says that "Sitophilus zeamais is predominantly found associated with maize grain, whereas Sitophilus oryzae is associated with wheat". It is a serious pests in stored grain especially corn and rice. Photo 3. Adults, up to 4 mm long, reddish-brown to black with four light-reddish to yellowish spots on the wings. 338). January Month Agriculture Current Affairs 2020. Mating often occurs within 24 hours of adult emergence from grain kernels. http://keys.lucidcentral.org/keys/v3/eafrinet/maize_pests/key/maize_pests/Media/Html/Sitophilus_zeamais_Motschulsky_1855_-_Maize_Weevil.htm. http://keys.lucidcentral.org/keys/v3/eafrinet/maize_pests/key/maize_pests/Media/Html/Sitophilus_zeamais_Motschulsky_1855_-_Maize_Weevil.htm. The two species look almost identical without magnification. It lives in many tropical areas around the world, and in the United States. Apple iOS Edition. Host range – Maize, sorghum, ragi and bajra. It is difficult to detect the weevil unless populations are high as it spends most of its life inside grain. Maize Insect Pest. Look for a dull red-brown to nearly black weevil, with faint yellowish or reddish spots on its back, at the corners of the wing cases (Photos 3&4).

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