CORE Metadata, citation and Picturesimilar papersSheet atNo. core.ac.uk Provided by University of Minnesota Digital Conservancy PRINCIPAL STORED For safe and effective use of , always identify the problem correctly.

3. Red flour 1. Granary weevil 2. Saw-toothed grain beetle ~

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4. Larger cabinet beetle • 5. Lesser grain borer ~ 6. weevil *

8. Cadelle - 7. Indian-meal • 9. Flat grain beetle ~

Some of these stored grain insects are also KITCHEN PESTS. The saw-toothed grain beetle, red , larger cabinet beetle, and Indian-meal moth de­ velop in flour, cake mixes, corn meal, breakfast foods and similar products. The Angoumois grain h 10. ~ mol ;afe,B popcorn. l!ill[li~i(ll1!1ii1iil1ll~ill!illl 3 1951 D01 928 509 2 Prepared by Extension Entomologists of the North Central States in cooperation with the Federal Extension Service, U. S. Department of J ;JOOO E F

University of Minnesota{D' Agricultural ~ten_gon Service@ Folder 233

CB PRINCIPAL STORED GRAIN INSECTS

1. GRA NARY WEEVIL, Sitophilus granarius (Lin­ corn meal, packaged foods, bagged grain, an:! grain naeus). This true weevil, along with the closely re­ in storage. Attack is confined to surface layers of lated rice weevil, is among the most destructive of stored, shelled corn, and small . With stored all stored grain insects. The larvae develop inside car corn, however, feeding occurs anywhere, since stored kernels of whole grain making an infestation the crawl among the ears to lay . Larval difficult to remove in the milling process. This weevil feeding is characterized by a webbing of the material is largely a of stor ed , corn, and , infested. The mature larvae then often leave the especially in elevator s, mills, and bulk storages. The material and cr awl about in homes or buildings in adult granary weevil can't fl y, and field infestations search of a place to pupate. don't occur in Minnesota. 8. CADELLE, T enebroides mauritanicus (Lin­ 2. SAW-TOOTHED GRAIN BEETLE, Oryzaephilus naeus). Both the adult and are large an:! easy surinamensis (Linnaeus) . Along w ith flour , to see, feeding mainly on the germ of stored grains. the saw-toothed grain beetle is one of the most com­ They may also attack milled products. The mon insects in stored grain and cereal products. The larvae leave stored grain in the fall and b urrow into larvae develop in flour, cer eal products, and many woodwork, such as wooden bins or boxcars, to hiber­ other dried foods. F or this reason, it is a common nate and may also burrow into packaged cereal pest not only in grain bins, but also in elevators, products, thus providing an entrance for other cereal mills, processing plants, war ehouses, and kitchens. pests. In grain bins, it feeds on broken kernels and grain residues. 9. FLAT GRAIN BEETLE, Cryptolestes pusi!lus (Schonherr) . This is a tiny beetle that feeds primar­ 3. , castaneum ily on the germ of stor ed grains, especially wheat. (Herbst) . This beetle is similar to the saw- toothed It is readily attracted to high-moisture grain. In fact, grain beetle in habits and types of products infested. under high moisture conditions, the fl at grain beetle It is a serious pest in flour mills and wherever cereal may also develop in many cereal products, but it products and other dried foods are processed or isn't a common pest in kitchens. stored. Like the (not pictured), the r ed flour beetle may impart a bad odor that af­ 10. ANGOUMOIS GRAIN MOTH, cerea­ fects the taste of infested products. lella (Olivier). This is a common and destructive pest of crib ear corn. It also infests stored, shelled corn 4. LARGER CABINET BEETLE, Trogoderma in­ and other small grains, but attack is confined to the clusum (Leconte). Representing a group a lso r efer­ su rface layer of grain. The larvae develop within the r ed to as Trogoderma, th e larger cabinet beetle is a kernels; therefore, the Angoumois grain moth isn't scavenger that feeds on cereal products and dried a pest of cereal products. Infestations in homes often matter. The f uzzy, slow -moving larvae-simi­ occur in stored popcorn or in colored ears of corn lar to the larvae of carpet, hide, and larder beetles­ kept for decoration purposes. The moth resembles are often found crawling on or near the products the clothes moth but doesn't shun light. they infest. 5. LESSER GRA IN BORER, dominica (Fabricius) . This pest is most common and destruc­ Current Control Information tive in warm climates, but can spread to any area in transported grain. It is only a problem of gr ain and The information and color illustrations presented not cereal products. The larvae develop inside the here are designed to h elp you correctly identify the kernels of whole grain. The adults also damage grain stored grain insects commonly found in Minnesota. by boring into the kernels and leaving them covered These pests and the problems they cause do w ith powder from the chewed material. not change, but the methods of dealing w ith them do. University extension entomologists have prepared the 6. RICE WEEVIL, Sitophilus oryzae (Linnaeus). following publications to keep grain producers and The rice weevil is similar to the granary weevil in consumers up-to-date on the latest r ecommended both appearance and habits. The name is misleading, control m ethods and m aterials: howe'rer, since it infests other grains besides r ice. Fact Sheet No. 8-Controlling Indian Meal-Moth Adult weevils can fly and, in warm climates, can in Stored Shelled Corn. cause widespread damage to corn, wh eat, and other Fact Sheet No. 9-Insects in Stored Grain. grains before harvest. Although field infestations Fact Sheet No. 13-Pantry P ests. don't occur in Minnesota, post-harvest infestations do. Such infestations originate from shipped- in Single copies of these publications, which are r e­ grain or from already infested storages. vised periodically, may be obtained by Minnesota residents, free of charge, from their local County 7. INDIAN-MEAL MOTH, Plodia interpunctella Extension Office, or from the Bulletin Room, Insti­ (Hubner). Common to both stored gr ain and cereal tute of Agriculture, University of Minnesota, St. Paul, products, Indian- meal moth larvae cause damage in Minnesota 55101.

Issued in furthera nce of coo pera ti ve work in agri cul t ur e and home economics, acts of May 8 and Jun e 30, 1914, in cooperation with t he U.S. Depo rtment of Agricul t ure. Ro land H. Abra ham, Acting Di rec t or of Ag ricu ltura l Extension Service, University of Minnesota, St. Paul , Mi nn esota 55101. S.BM-1-68 h