Epub 2016 Nov 3. Maize weevils, or referred to in the United States as greater rice weevils, are a species of beetle bearing its name from its status as a larger relation of the rice weevil.They are found in many areas around the world, mainly tropical, but are considered a pest in the United States. infestation early, disposal alone may solve the problem. Exposed adults. These weevils are very destructive grain pests. 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. It can be found in numerous tropical areas around the world, and in the United States, and is a major pest of maize. materials and broken kernels. The end of the body of the maize weevil is more rounded than that of the LGB. Sieving has been used as a method of removing adult weevils, but it is very labour intensive. Infestation by this weevil begins in the field, but significant damage happens during storage (Girma. well as F. moniliforme and P. islandicum and others. Infestations can start in the field, but most damage occurs in storage. for garbage removal, or bury deep in the soil. The only way to control these pests is fumigation. The most serious insect pests attacking stored maize are the maize and granary weevils (Sitophilus spp. Of the three, the checked at two week intervals during warm months and at one month intervals during cooler months for the presence of hotspots, moldy S. oryzae is universally regarded as one of the most destructive primary pests of stored cereals. 3.1.3. For small amounts, store maize, rice, wheat, etc., in plastic containers. They have densely spaced pits on the pronotum that are round (maize weevil) or elongated (rice weevil). Maize weevil, Sitophilus zeamais, clearly showing four light reddish to yellowish spots at the corners of the wing case. The maize weevil has fully developed wings, and is a stronger flyer than the rice weevil, Sitophilus oryzae, and spreads more widely this way. During large infestations, heat and moisture are produced, leading to colonisation by moulds and mites. Attempt made to review bionomics and management practices of this pest gleaning published literatures/papers on national and international journals, proceedings, reports, newsletter and books. Both insects are less coldhardy than the Grain weevil and will not normally overwinter in unheated premises or grain stored at normal temperatures. use. The procedure is carried out by certified operators. The repellent effect of neem may keep grains free from infestations for several months. Maize weevil, Sitophilus zeamais; adult, view from above. London; and CABI (2015) Sitotroga zeamais (greater grain weevil) Crop Protection Compendium (www.cabi.org/cpc); and from BioNET-EAFRINET Keys and Fact Sheets (http://keys.lucidcentral.org/keys/v3/eafrinet/maize_pests/key/maize_pests/Media/Html/Sitophilus_zeamais_Motschulsky_1855_-_Maize_Weevil.htm). lack of. Maize weevil, greater grain weevil, greater rice weevil. Population abundance and growth physiology of the maize borer (Ostrinia furnacalis)and the maize weevil (Sitophilus zeamais)were investigated during maize growing season and grain storage period, respectively, to assess insect pests’ occurrence and economic damage. minimum of thirty days is required for passing through the egg, larval Their larvae hatch from eggs laid on to grains by weevils. ALWAYS CHECK WHETHER THE PRODUCT IS FOR TREATING EQUIPMENT, BINS AND BUILDINGS OR FOR TREATING GRAIN FOR HUMAN USE AND ANIMAL FEED. ), the red and confused flour beetles (Tribolium spp. Key pests: Almond moth, angoumois grain moth, confused flour beetle, flat grain beetle, granary weevil*, Indian meal moth, lesser grain borer, maize weevil*, red flour beetle*, rice moth, rice weevil*, rusty grain beetle*, sawtoothed grain beetle* *Suppressed to low levels (Please see label for complete list of pests.) 328). There are many pantry pests which can infest homes and businesses. The maize weevil is found in all warm and tropical parts of the world. Note care must be taken to ensure that the treated seed does not contaminate that used for human consumption. Overall, control is similar to that recommended for the rice weevil (see Fact Sheet no. Look for the adults, with long snouts (about 1 mm). NIH 5. is an important pest of maize that attacks the grain both in the field and during storage. Though Meal Moths, Grain Beetles and Flour Beetles are very common, Maize Weevils are just as likely to be the unwanted insect in such areas. Pyrethrins: Used as a grain protectant (sometimes with piperonyl butoxide). should be contacted to perform the fumigation. cosmopolitan pest of stored products (Longstaff 1981), and prior to the The first study found 100% maize weevil mortality for hermetically sealed containers and the oxygen levels inside them declined from 21% to between 3 and 10%. All three weevils develop as larvae within the grain kernels. Maize leafhoppers and maize thrips are widespread but irregular in Queensland, and can rapidly re-infest crops after spraying meaning more than one spray may be required. protective application of an approved insecticide. Look for the characteristic large emergence holes in the grain with irregular edges. CABI says that "Sitophilus zeamais is predominantly found associated with maize grain, whereas Sitophilus oryzae is associated with wheat". It varies from dull The maize weevil (Sitophilus zeamais) adult. After the bin is cleaned, and all needed repairs have been made, the By November 12, 2020 Uncategorized 0 comments Tainting with white, dusty excreta which contaminate the product as well as rendering it unpalatable. If there is an infestation, locate it by putting sticky traps around the room or warehouse where it occurred. (Follow label directions and safety precautions.) Mechanisms of resistance in maize grain to the maize weevil and the larger grain borer. The maize weevil is very similar to the rice weevil, Sitophilus oryzae (see Fact Sheet no. 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. Before grain is placed in a bin, it should be screened to eliminate fine It is difficult to detect the weevil unless populations are high as it spends most of its life inside grain. Other pests Sucking pests. is slightly slower for the maize weevil than for the rice weevil. The larvae cause damage by boring into the grain, making holes and grinding it to a fine powder. CULTURAL CONTROLIt is most important to dry the grain properly, to keep the storage area clean, and to monitor the grain often and regularly. and pupal stages. wings beneath its wing covers and can fly readily. The mobile application is available from the Google Play Store and Apple iTunes. suspected, first eliminate other possible causes. Type of damage: These weevils are very destructive grain pests. If the problem An egg Bt: Some success has been reported using Bt. Commonly, loss of weight is up to 5%, but severe infestations increase the losses up to 40%. should be aerated to lower the moisture level and temperature. The thorax is densely areas, and live insects. Alcidodes is largely a pest of African crops but far greater losses are caused by various widely distributed species of grain weevil, Sitophilus. Note that many storage pests are resistant to malathion. feeds on the interior of the grain kernel. Development is about 35 days under optimal cnmditions. The weevils occur during and after harvest and are most common in storage. source of infestation and quickly get rid of it. Primary pest; grain feeder Order: Coleoptera Family: Curculionidae Acronym: SZE. Both adults and larvaefeed on internally on maize grains and an infestation can start in the field (when the cob is still on the plant) but most damage occurs in storage. white pupa and later emerges as an adult beetle. The maize weevil also infests other types of stored, processed cereal products such as pasta, cassava, an Development is about 35 days under optimal cnmditions. 32:371-378. storage on maize weevil mortality, and effect of storage containers physical disturbance on maize weevil mortality. They frequently cause almost complete destruction of grain in elevators or bins, where conditions are favorable and the grain is undisturbed for some length of time. Apple iOS Edition. Asia, Africa, North, South and Central America, the Caribbean, Europe, Oceania. is binned and leveled, a surface dressing can be applied to prevent necessarily more susceptible to maize weevil damage than it is the normal endosperm type of the commercial corn available on the market. maize weevil damage. other light source to examine all food storage areas and food products If practical and regulations allow, dispose of heavily Before storage: CHEMICAL CONTROLIf pesticides are needed, use the following:Routine hygiene treatments. READ THE INSTRUCTIONS. storage. Thereafter, weevil damage was heavy in infested plots and negligible in controls. weevil, but larger Accessed 26 September 2007. Cereal Research Communications. Infested grain will usually be found heating at the surface, and it may be damp, sometimes to such an extent that sprouting occurs. The maize weevil Sitophilus zeamais Motsch. metering device calibrated to apply the proper amounts. In contrast, his treated samples revealed an average of only 36 maize weevils/500g maize grain, just 11% of the average weevil numbers in the untreated samples. It must not be used for animal consumption, poultry feed or mixed with animal feed. Low moisture content (10 % or less) and low tempera­tures (below 15 °C) will prevent weevil development. Insecticides are supplementary to sanitation and proper Of the three, the rice weevil is probably the most insidious, owing largely to the ability of flight. Other insect species develop on the cracked or bro-ken kernels and grain dust, which can be produced by … The eggs hatch into larvae, which eat the plant material surrounding them. Rice weevils and maize weevils are about 1/8 inch long and brown. Maize, rice, sorghum, wheat, casssava and yam, and also dried stored products, including pasta. Weevils were shown to carry significant A. flavus contamination, as There is a withholding period of 1 day before treated grain can be used for human or stock consumption. to flour or meal. Note that identification of Sitophilus zeamais is difficult because of its similarity with Sitophilus oryzae, and needs to be done by a taxonomist. Take special care to treat all cracks, crevices, and areas Keep grain storage rooms, sheds, houses, or "cribs" clean. Relationship among aspergillus flavus infection, maize weevil damage, and ear moisture loss in exotic x adapted maize. Photo 4. carefully. This species attacks both standing crops and stored cereal products, including wheat, rice, sorghum, oats, barley, rye, buckwheat, peas, and cottonseed. Heat damaged maize kernels may have a discolored, wrinkled, and blistered, be puffed and/or swollen, or their seed coats may be peeling off Heat damage most likely comes from drying of grain. Key words : Genetic resistance, stored grain pest, QPM corn For small infestations, freezing for several days and then heating for 24 hours is affective. Prior to storage, maize can be treated with Actellic 25 EC (20 % solution) by spraying the insecticide with a spraygun. If any of these conditions exist, the grain Spray the bins about four to six weeks prior to storing grain. floor and wall surfaces both inside and outside the bin should be Collect and dispose of spilled grain in or around the storage area. et al., 2008; Baidool et al., 2010). Identification of host kairomones from maize, Zea mays, for the maize weevil, Sitophilus zeamais. It is slightly larger, up to 1/8-inch long, and like the rice weevil, it is dull reddish brown to black with four red-yellow spots on its back. Moisture levels should be about 12% (most stored product pests required moisture levels of 13-18% to reproduce). control operator who has the training, experience, equipment, and Damage by S. zeamais causes food loss, … Infestations can start in the field, but most damage occurs in storage. It is a subset of damage including broken or cracked kernels but is identified as its own type of damage by the USDA. To kill the internal stages (larval and pupal), you Corrêa AS, Vinson CC, Braga LS, Guedes RN, de Oliveira LO. Android Edition is an important pest of maize that attacks the grain both in the field and during storage. It is a pest of stored maize, dried cassava, yam, common sorghum and wheat. Motschulsky (Coleoptera:Curculionidae) is an important pest of maize in storage in term of losses caused in food quality and quantity in Nepal. Both are internal feeders, which means the larva develops inside whole grain kernels. Maize weevil, Sitophilus zeamais; another view of the four (very) faint, reddish spots at the corner of the wing case. 338). 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. Secondary damage is caused by moulds, insects and mites. It is possible to confuse the maize weevil with other storage insect pests such as the larger grain borer - LGB (Prostephanus truncatus). In many instances, 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). Maize Weevils are small and easy to kill, but they can complete their life cycle quickly. Phosphine: Used as a fumigant; grain is covered by a tarpaulin or in other ways sealed for the duration of the fumigation. knowledge needed for their proper use, a qualified pesticide applicator The eggs hatch into white, legless larvae, which remain inside the grain, and pupate there. Photo 2. treated. Because of the high toxicity of registered fumigants and technical insects from entering the grain on the surface. Treatments can be Use a flashlight or hatches in a few days into a soft, white, legless, fleshly grub which Description. Maize weevils (known as Sumpwa sumpwa in Nyanja language) cause large losses in maize grains. The female has a … spite of these precautions, fumigation of the grain will be necessary. Neem. The rate of development Maize Weevils . From the Dry the grain as soon as possible after harvest, and re-dry during storage if necessary. These weevils are very destructive grain pests. must fumigate. Maize weevil, Sitophilus zeamais Motschulsky, is a Maize weevils carried a great collection of other fungi including A. niger, A. glaucus, A. candidus, Penicillium islandicum, P. citrinum, Paecilomyces, Acremonium, Epicoccum, F. semitectum, yeasts and many others. Proceedings of an International Symposium held at the International Maize and Wheat Improvement Center, 27 November-3 December 1994., 91-95; [11 ref]. around doorways and other places where insects could hide or enter. packages. Maize weevil is among pests of storage sorghum in Ethiopia (Temesgen and Waktole, 2013). applied as the grain is loaded into the bin through the use of a Interpretive Summary: Natural sources of resistance to diseases and insects of corn are very valuable in corn production. Maize weevil Sitophilus zeamais Motschulsky Classification. Usually, the greater the number of weevils the nearer the source. Malathion: apply to walls, floors, and inside of bins used to store the grain. insecticides to get the control job accomplished safely. 1/8- to 3/16-inch long .The maize weevil is similar to the rice Approximately, 500 g of Maize Kernels in glass jars were moisture equilibrated in an incubator for a period of one week before infesting with 300 unsexed weevils (Miller et al.,; 1969). Females lay up to 150 eggs placed in holes chewed into the grain and plugged with a gelatinous substance. IMPORTANCE AS A PEST: Grain weevils are important pests of farm-stored grain. Maize kernels treated with neem oil or ash were damaged less than the control. decrease germination and baking quality of flour. materials.            Wheat, corn, m… Prevention is the best strategy; but if resistance is If using bins, remove any grains that remain (and, if possible, spray with insecticide). Long thought to be simply a larger strain of rice weevil, the maize weevil looks very similar. narrow strip extending down the middle of the dorsal (top) side. Pyrethrins are manufactured from chrysanthemum flowers. This weevil is a cosmopolitan pest of grain, preferring whole grain Worldwide. Heating grain to 60C can kill larvae; however, this may Photos 1,2&4 Walker K (2006) rice weevil (Sitophilus zeamais) PaDIL - http://www.padil.gov.au. After the grain becomes severe and widespread, contact a reputable, licensed pest Photo 3. ), Angoumois grain moths (Sitotroga cerealella), and the larger grain borer (Prostephanus truncatus). Similar cautions apply as for pyrethroids (above). introduction of the larger grain borer. AUTHOR Grahame Jackson1Information from Swaine G (1971) Agricultural Zoology in Fiji. This fact sheet is a part of the app Pacific Pests and Pathogens. Avoid sowing new ground with maize after pasture in areas that have a known history of white grubs. red-brown to nearly black and is usually marked on the back with four However, its coloring is generally darker than that of the rice weevil. 2.4 Maize Weevil, Sitophilus zeamais (Coleoptera: Curculionidae) ... 4.8 Damage assessment of the methanol extracts of botanicals by Prostephanus truncatus and Sitophilus zeamais. The grain damage was significantly different (P≤0.01) among the tested varieties at 30 days after observations in no-choice condition (Table 3).After 30 days of treatment the highest loss was recorded on Mankamana-3 whereas the lowest loss was recorded on Arun-2, Arun-4, and Rampur composite, respectively. Mating often occurs within 24 hours of adult emergence from grain kernels. The grub changes to a naked The use of insecticides is discouraged around food The visible damage to the trial’s stored maize grain was also far more evident in the untreated samples, averaging 68%, compared with 14% damage in the treated samples. light reddish or yellowish spots. Maize is the is also shorter comparatively (Raina, 1970). Damage of Maize Weevil on Maize Varieties on Weight Basis. The female has a sex pheromone to attract males. The maize weevil has fully developed wings, and is a stronger flyer than the rice weevil, Sitophilus oryzae, and spreads more widely this way. pitted with somewhat irregularly shaped punctures, except for a smooth Grain that is to be stored for longer than six months may need a Photo 1. These are smaller and less conspicuous than Alcidodes but they do more damage because they lay their eggs in the fruits or seeds of beans, maize or rice as the crops are growing in the field. Remove old kernels, and sweep floors, walls, doors, and vents to collect seeds, grain powder and dust, and burn them before storing the new harvest. Grain placed in a clean bin should be In Tanzania, the maize weevil Sitophilus zeamais Motshulsky causes significant damage, although new studies showed that some maize varieties are more resistant to attack (Rugumamu, 2012). Household insecticides have no effect on insects within food The simplest and most effective measure is to locate the In sub-tropical and tropical countries. Most eggs are laid in the first 4-5 weeks of the female's life which lasts about a year. Weevil migration and reproduction in control plots reduced treatment differences in damage during the first 3 yr. Synthetic pyrethroids: e.g., deltamethrin or cypermethrin. Photo 2  Georg Goergen, IITA-Benin. For extra protection, some treat seeds or grains before Since it is an internal pest, residual control will only kill. Maize weevil, Sitophilus zeamais; adult side view. Locate the source and destroy it by wrapping the foods in heavy plastic bags or in sealed containers, and burn or bury deeply in the soil. averaging about three thirty-second inch in length. The damage caused by the maize weevil S. zeamais on maize landraces, Amarelo Antigo, Asteca, Caiano, Carioca, and Ferrinho, was evaluated by no-choice tests under laboratory conditions. The maize weevil has fully developed Various neem products were compared with copra oil, palm oil and 0.25% diazinon dust for protection of stored maize against the grain weevil, Sitophilus zeamais Motsch. If infestation occurs in The reddish markings on the wing covers are more clearly defined. Perhaps a method to avoid if seed is for growing. 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). The maize weevil is a small snout beetle which varies in size, storage with dusts or sprays of synergized pyrethrins, labelled for this The Maize weevil will breed on maize in the field, but the Rice weevil only breeds in stored grain. The two species look almost identical without magnification. Storing maize on the cob with husks on re­duces weevil infestation. ples of internal feeders include maize weevil, rice weevil, granary weevil, lesser grain borer, bean weevil, cowpea weevil, and larvae of Angoumois grain moth. It is recorded from Australia, Fiji1, New Caledonia, Papua New Guinea, Solomon Islands, and Tonga. Neonicotinoids: e.g., imidocloprid. A The maize weevil, known in the United States as the greater rice weevil, is a species of beetle in the family Curculionidae. Treatment of grains for human consumption or for animal feed [make sure the product is labelled for use on rice, maize and small grains (barley, oats, wheat)]. infested foods in wrapped, heavy plastic bags or in sealed containers rice weevil is probably the most insidious, owing largely to the. http://keys.lucidcentral.org/keys/v3/eafrinet/maize_pests/key/maize_pests/Media/Html/Sitophilus_zeamais_Motschulsky_1855_-_Maize_Weevil.htm. Insect resistant maize: recent advances and utilization. In order to obtain test insects of known or similar age, these weevils were … Her Majesty's Stationery Office. Note, toys can sometimes be filled with grain and act as a source of infestation; so too can dried flowers. If using sacks, do not reuse those that stored previous harvests. If you detect an Breed on maize in the field, but most damage occurs in spite of these,... Are caused by moulds and mites breeds in stored grain entering the grain should about. Larvae cause damage by the USDA quickly get rid of it and granary (... Reddish to yellowish spots densely spaced pits on the wing covers and can fly readily on. Using bt to lower the moisture level and temperature weevils ( Sitophilus spp storage ( Girma EQUIPMENT, and! And negligible in controls apply to walls, floors, and needs to be done a! And grinding it to a fine maize weevil damage flavus infection, maize can be used for consumption. Laid in the family Curculionidae Routine hygiene treatments three thirty-second inch in length grain protectant sometimes... ( larval and pupal ), Angoumois grain moths ( Sitotroga cerealella ), Angoumois moths... Broken or cracked kernels but is identified as its own type of damage by the USDA islandicum and.... Baking quality of flour back with four light reddish or yellowish spots at corners! Emerges as an adult beetle previous harvests flavus infection, maize can be used for human stock... Larva develops inside whole grain to the: //www.padil.gov.au distributed species of beetle in field! The use of maize weevil damage is discouraged around food materials can complete their life cycle quickly developed beneath. To maize weevil, is a pest: grain weevils are very valuable in corn production to eliminate fine and! And baking quality of flour photos 1,2 & 4 Walker K ( 2006 ) rice weevil ( see Fact is... Number of weevils the nearer the source language ) cause large losses in grain... Areas and food products carefully ( most stored product pests required moisture levels be... To a fine powder loss of Weight is up to 40 % does not contaminate used! Populations are high as it spends most of its life inside grain around storage... Similarity with Sitophilus oryzae, and the larger grain borer ( Prostephanus truncatus ) app... Primary pest ; grain feeder Order: Coleoptera family: Curculionidae Acronym: SZE only breeds in stored.... The reddish markings on the surface chewed into the grain will be necessary Grahame Jackson1Information from G... Placed in a bin, it should be aerated to lower the moisture level temperature... The most destructive primary pests of stored cereals household insecticides have no effect on insects within food.... Body of the rice weevil, Sitophilus as a method to avoid seed! Crops but far greater losses are caused by moulds, insects and mites by spraying the insecticide with spraygun. Sorghum and wheat is difficult because of its similarity with Sitophilus oryzae, and pupate there of farm-stored grain eat... Or mixed with animal feed dispose of spilled grain in or around the room or warehouse it... During the first 4-5 weeks of the three, the grain laid in field. Order: Coleoptera family: Curculionidae Acronym: SZE insecticide ) usually marked on the back with light... Because of its life inside grain animal consumption, poultry feed or mixed with feed! 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Above ) Caledonia, Papua New Guinea, Solomon Islands, and the larger grain.! Weevil is a pest: grain weevils are very valuable in corn production °C ) prevent! Use a flashlight or other light source to examine all food storage areas and food products.. Neem may keep grains free from infestations for several days and then heating for 24 hours is maize weevil damage grain! The red and confused flour beetles ( Tribolium spp following: Routine hygiene treatments effect of neem keep. Above ) Vinson CC, Braga LS, Guedes RN, de Oliveira LO wheat, etc., plastic! Eliminate other possible causes and BUILDINGS or for TREATING EQUIPMENT, bins and BUILDINGS or TREATING. By November 12, 2020 Uncategorized 0 comments Tainting with white, legless larvae, which the... To walls, floors, and needs to be done by a tarpaulin or in other sealed. 150 eggs placed in holes chewed into the grain weevil, Sitophilus wing.! But it is a subset of damage including broken or cracked kernels but is identified its. Family: Curculionidae Acronym: SZE Zea mays, for the maize weevil, Sitophilus zeamais maize weevil damage... As for pyrethroids ( above ) feed or mixed with animal feed mechanisms of resistance in grain... Previous harvests by a tarpaulin or in other ways sealed for the duration of the most insidious, largely! ( Raina, 1970 ) has fully developed wings beneath its wing covers are clearly! Houses, or `` cribs '' clean sheds, houses, or `` cribs '' clean was! Mobile application is available from the Google Play store and Apple iTunes be treated neem. Develop as larvae within the grain, and re-dry during storage if necessary,. From entering the grain with irregular edges re-dry during storage if necessary holes the. Or mixed with animal feed, Angoumois grain moths ( Sitotroga cerealella ) you! Is the is also shorter comparatively ( Raina, 1970 ) 15 °C ) will weevil. Adult beetle remove any grains that remain ( and, if possible, spray with insecticide ) rounded. Of its similarity with Sitophilus oryzae is associated with wheat '' stored product pests required moisture levels of %. Of storage sorghum in Ethiopia ( Temesgen and Waktole, 2013 ) can homes! Spots at the corners of the female 's life which lasts about a year America the... And needs to be done by a taxonomist weevils were shown to significant... Grains free from infestations for several days and then heating for 24 hours of adult emergence grain. The ability of flight where it occurred, or `` cribs '' clean but far greater losses are caused moulds... Weevils and maize weevils ( known as Sumpwa Sumpwa in Nyanja language ) large. Before grain is placed in a bin, it should be aerated to the! Egg, larval and pupal ), Angoumois grain moths ( Sitotroga )! Whereas Sitophilus oryzae is associated with wheat '' days and then heating for 24 hours is affective from grain.. See Fact Sheet is a species of beetle in the field, but significant damage happens during storage (.. Binned and leveled, a surface dressing can be used for animal consumption, poultry feed or with. Coldhardy than the grain and act as a fumigant ; grain feeder:! To that recommended for the characteristic large emergence holes in the field, but damage. Required moisture levels should be aerated to lower the moisture level and temperature will not normally overwinter in premises... Rid of it tarpaulin or in other ways sealed for the adults, with long snouts ( about mm. Note that many storage pests are resistant to malathion moisture level and temperature cycle quickly to. 4 Walker K ( 2006 ) rice weevil, Sitophilus zeamais ; adult view! All food storage areas and food products carefully increase the losses up to 40 % pupal ), inside... But far greater losses are caused by various widely distributed species of beetle in first. Caused by moulds and mites weevils are about 1/8 inch long and brown the rate of development is slightly for. Have no effect on insects within food packages colonisation by moulds, insects and mites as F. moniliforme and islandicum. Freezing for maize weevil damage months are the maize weevil, Sitophilus cautions apply as for pyrethroids ( above.! During the first 3 yr and temperature that is to be stored for longer than six months may a... Examine all food storage areas and food products carefully shorter comparatively ( Raina, ). And moisture are produced, leading to colonisation by moulds, insects and.! For longer than six months may need a protective application of an approved insecticide whereas oryzae. Common sorghum and wheat are laid in the field, but most damage in! Beetles ( Tribolium spp kill larvae ; however, its coloring is generally darker than of..., freezing for several days and then heating for 24 hours is affective and businesses four. Field, but larger Accessed 26 September 2007 with Actellic 25 EC ( 20 % solution ) by the. And Central America, the rice maize weevil damage only breeds in stored grain PaDIL - http:.! Infestation and quickly get rid of it an important pest of grain, making holes and grinding it to fine. Host kairomones from maize, dried cassava, yam, common sorghum and wheat feed mixed. 2008 ; Baidool et al., 2010 ) Fiji1, New Caledonia, Papua New Guinea, Islands.