The kernels can be white, yellow, red, purple or black. Photo 3. These insects have chewing mouthparts. 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. They can be in stored grains of all types including wheat, corn, oats, barley, sorghum, macaroni, and other grain products. This page was last changed on 8 September 2020, at 12:42. Similar cautions apply as for pyrethroids (above). The procedure is carried out by certified operators. Photo 2. Look for the adults, with long snouts (about 1 mm). The eggs hatch into white, legless larvae, which remain inside the grain, and pupate there. For small infestations, freezing for several days and then heating for 24 hours is affective. Note, toys can sometimes be filled with grain and act as a source of infestation; so too can dried flowers. Infestations can start in the field, but most damage occurs in storage. 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. They have densely spaced pits on the pronotum that are round (maize weevil) or elongated (rice weevil). The maize weevil is very similar to the rice weevil, Sitophilus oryzae (see Fact Sheet no. In larger infestations of stored grain warehouses and silos, remediation will require emptying the infested areas, cleaning and the use of residual insecticide. They build up in numbers in stored grain. Some weevils have the ability to fly such as rice weevil. It attacks wheat, rice, sorghum,[4][5][6] oats, barley, rye, buckwheat,[6] peas, and cottonseed. In the United States, it is called the greater rice weevil. 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. This ability allows them to travel from field to storage facilities. Scientific name: Sitophilus zeamais 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. The mobile application is available from the Google Play Store and Apple iTunes. Apple iOS Edition. However, in most cases if it’s not fit for consumption the materials should be disposed of. If using bins, remove any grains that remain (and, if possible, spray with insecticide). The maize weevil (Sitophilus zeamais) is a species of beetle in the family Curculionidae. Eggs laid into holes chewed in grain, and then plugged. Flour weevils are a generic name for a variety of weevils belonging to the order Coleoptera and the family Curculionidae, which include the grain, rice and wheat weevils that have the following common characteristics. Holes in the side of the grain are made by adults and by the emerging adults. Maize weevil, greater grain weevil, greater rice weevil. Phosphine: Used as a fumigant; grain is covered by a tarpaulin or in other ways sealed for the duration of the fumigation. [3] This species attacks both crops that are still growing and those that have been harvested. Rice weevils and maize weevils are about 1/8 inch long and brown. 338). If there is an infestation, locate it by putting sticky traps around the room or warehouse where it occurred. The female has a sex pheromone to attract males. The two species look almost identical without magnification. Infestations can start in the field. Welcome to the Department of Entomology at Texas A&M University! Her Majesty's Stationery Office. Note care must be taken to ensure that the treated seed does not contaminate that used for human consumption. Asia, Africa, North, South and Central America, the Caribbean, Europe, Oceania. Mating often occurs within 24 hours of adult emergence from grain kernels. Attacks sound grains, leaving large cavities, and allowing secondary invasions by insects, mites, and fungi. AUTHOR Grahame Jackson1Information from Swaine G (1971) Agricultural Zoology in Fiji. Host range–  Sorghum, Maize, Rice, Millets. Both are internal feeders, which means the larva develops inside whole grain kernels. This mini fact sheet is a part of the app Pacific Pests, Pathogens & Weeds. Photo 4. CABI says that "Sitophilus zeamais is predominantly found associated with maize grain, whereas Sitophilus oryzae is associated with wheat". Photo 3. Required fields are marked *. If using sacks, do not reuse those that stored previous harvests. Look for the characteristic large emergence holes in the grain with irregular edges. The maize weevil also attacks processed cereal products such as pasta, cAgassava,[5] and various coarse, milled grains. Your email address will not be published. January Month Agriculture Current Affairs 2020. London; and CABI (2015) Sitotroga zeamais (greater grain weevil) Crop Protection Compendium (; and from BioNET-EAFRINET Keys and Fact Sheets ( Products that need to be retained may be placed in the freezer for several weeks to kill adults and larvae. The maize grains, or 'kernels', are encased in husks and total 30–1000 per ear. It is a major pest of maize. Maize weevil, Sitophilus zeamais, clearly showing four light reddish to yellowish spots at the corners of the wing case. On rice, maize, sorghum, wheat, cassava, and other stored products. Texas A&M Veterinary Medical Diagnostics Laboratory, Texas A&M College of Agrculture and Life Sciences. Eggs laid in holes chewed in grain, then plugged. Eggs laid in holes chewed in grain, then plugged. Facts: Maize weevil (rice weevil) is a small weevil only a few millimeters long. In the United States, it is called the greater rice weevil. Photo 4. FIVS Student Admission, Retention and Graduation, Professional Licensure and Certification Disclosure Statement, Forensic and Investigative Sciences Awards, Forensic and Investigative Sciences Honors Program, Potential Asian Giant Hornet Specimen/Photograph Submission Form. The maggot feeds on the young growing shoots resulting in “dead hearts”. Development is about 35 days under optimal cnmditions. 1.Maize shootfly. Larvae feed inside the grain, and pupate there. Store small amounts of grain in plastic containers. A destructive weevil. Worldwide distribution. Bt: Some success has been reported using Bt. It is a major pest of maize. Worldwide. Secondary damage is caused by moulds, insects and mites. National Seeds Corporation Previous Year Question Paper. Insect resistant maize: recent advances and utilization. Infestations can start in the field. READ THE INSTRUCTIONS. The maize weevil ( Sitophilus zeamais) is a species of beetle in the family Curculionidae. 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. It is difficult to detect the weevil unless populations are high as it spends most of its life inside grain. The grain or wheat weevil is popular to damages stored grain. Damage symptoms. This organic concentrate is fast acting and safe enough to use on corn, tomatoes and more with just one day to harvest. Maize weevil, Sitophilus zeamais, clearly showing four light reddish to yellowish spots at the corners of the wing case.


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