This damage is often less severe compared to larval damage. Grains which float in water often indicate larval damage. Strawberry root weevil (Otiorhynchus ovatus) is the most common home-invading weevil in Minnesota.You may find these weevils indoors from the end of June through August. of. It varies from a dull red-brown to black, and is usually marked on the back with four light red to yellow spots. Legs are ruddy in appearance, and the hind legs bear spiny protrusions. Table 3 Canonical (for CVA) and factor (for principal R-factor analysis) loadings of the significant ( p <0.05) canonical axes (CVA) and factors for the behavioral traits of both sexes from 15 populations of the maize weevil ( Sitophilus zeamais ). Individual traits vary among and within populations, and the co-occurrence of different endosymbiont species within a host may take place under varying endosymbiont loads in each individual host. Angoumois grain moth can coexist with sawtoothed grain beetle. Maize weevil infestation is the source of many problems in stored corn, he adds. It is black-brown in coloring although it can be red-brown shortly after adult emergence. http://www.infonet-biovision.org/default/ct/91/pests. Adults can fly. Adults emerge from the grain and can be seen walking over the grain surfaces. Accessed on 28 Jan 2010. All three species attack grain and grain products, but they are primarily pests of whole grain in storage. If you examine the thorax closely you can see longitudinal punctures. It is approximately 1/8 inch long (3 mm). Vine weevil is a very widespread insect in Britain. Granary Weevil: This weevil is slightly larger (3/16 inch (4.8 mm)) than the other two weevils. Ceylon. Crop Protection Compendium, 2010 Edition. Maize Weevil: This weevil also has small distinct colored spots on the forewings, and punctures on the thorax, including the midline. The antennae of the bean weevil also appear reddish in coloration. Researchers at HTA and CIMMYT have attempted to combat maize weevil infestation by selecting maize genotypes with tight husk cover (Kim et … AGM and saw-toothed grain beetle can coexist, but maize weevil or lesser grain borer will suppress AGM population. Both adult and larva damage the grain by chewing. It is a pest of stored maize, dried cassava, yam, common sorghum and wheat. They have densely spaced pits on the pronotum that are round (maize weevil) or elongated (rice weevil). This activity was undertaken as part of the BioNET-EAFRINET UVIMA Project (Taxonomy for Development in East Africa). Krischik V.A., Cuperus G and Galliart D (eds.).1995. Cyfluthrin was also evaluated on corn at application rates of 0.5, 1.0, 1.5, and 2.0 ppm (Arthur 1994b). lesser grain borer and the maize weevil. Anne M. Akol, Makerere University; Maneno Y. Chidege, Tropical Pesticides Research Institute; Herbert A.L. ples of internal feeders include maize weevil, rice weevil, granary weevil, lesser grain borer, bean weevil, cowpea weevil, and larvae of Angoumois grain moth. Minimum temperature RH for development is 16˚C (60.8˚F)/30% Rh; optimum is 30˚C (86˚F)/75% Rh and the maximum is 36˚C (85˚F). It is a pest of stored maize, dried cassava, yam, common sorghum and wheat. The rice weevil is a small snout beetle which varies in size, but it averages about three thirty-seconds inch in length. Like most stored grain insects, AGM infestations can begin from adults emerging from small amounts of carry-over corn in a … Bean weevils also do not possess the telltale jutting snout present on true weevil species. Dent D. (2000). “A maize weevil female can lay about 400 eggs in an eight-month period,” Saeed explains. Sitophilus zeamais (maize weevil) datasheet. Red flour beetle survival was variable but no larval or adult FIS were detected in the deltamethrin treatments (Table 6). Ganesalingam VK, (1977). Granary Weevil: This weevil is slightly larger (3/16 inch (4.8 mm)) than the other two weevils. document.write(new Date().getFullYear()); Adult emergence holes are large with irregular edges. Also, the granary weevil cannot fly, whereas the rice weevil can fly. ARS-58 (Coleoptera:Curculionidae) December1986 O' x:o oo. English: maize weevil, greater grain weevil, northern corn weevil, greater rice weevil. Talwana, Makerere University; John R. Mauremootoo, BioNET-INTERNATIONAL Secretariat. The larva remains inside the kernel until adult emergence. Granary Weevil: This weevil is slightly larger (3/16 inch (4.8 mm)) than the other two weevils. The pupal case can be reddish brown to nearly black, depending on age. It is approximately 1/8 inch long (3 mm). There are three larval molts. ^'/y/97. The large emergence holes with irregular edges are characteristic. It can be found in numerous tropical areas around the world, and in the United States, and is a major pest of maize. This Other insect species develop on the cracked or bro-ken kernels and grain dust, which can be produced by harvesting or binning procedures. This material may be available in alternative formats. ©Gary Alpert, Harvard University, Bugwood.org, Maize damaged by Sitophilus zeamais. Controlling of the pest by Controlling of the pest by use of synthetic pesticides is raising serious concern on the environmental safety and consumer health hazards. Motschulsky. The end of the body of the maize weevil is more rounded than that of the LGB, and its mouthparts are 'beak-like' and antennae elbowed. Field collections of maize weevil populations from nine Mexican states (Fig. To kill the internal stages (larval and pupal), you must fumigate. Similarly, the yellow /grains to weevils during . Journal of Science, Biological Sciences, 12(2):169-176. Females release a sex pheromone which attracts males. Same as above ... borer, maize weevil, Red flour beetle, Rice weevil, Rusty grain beetle, Saw toothed grain beetle Each female may lay up to 150 eggs in her lifetime. Bean Weevil. Development time from egg to adult varies with temperature from 30 days at 30˚C (86˚F) and 40 days at 25˚C (77˚F). Maize weevil survival and subsequent progeny production was extensive on Adult maize weevils are 3 – 3.5 mm long, dark brown – black in colour and shiny and pitted with numerous punctures. The only way to control these pests is fumigation. 204 pp. BioNET-EAFRINET Regional Coordinator: eafrinet@africaonline.co.ke, Sitophilus zeamais Motschulsky, 1855 - Maize Weevil, Coombs CW, Billings CJ, Porter JE, (1977). The last larval instar usually spins a silken cocoon within the feeding cavity. Disability-related accessibility issue? Please contact us at entmwebmaster@purdue.edu so we can help. LGB compared to the maize weevil P. trancatus Maize weevil S. zeamais The head of the LGB points downward and cannot be seen from above whereas that of the weevils and flour beetle points forward. Insect pest management.CAB International Wallingford, UK, Infonet-biovision. The elytra also usually have four pale reddish-brown or orange-brown oval markings. The maize weevil is found in all warm and tropical parts of the world. Wallingford, UK. CAB International Publishing. Gardeners with vine weevil should keep up their guard because stopping control measures after the apparent disappearance of the weevil can allow numbers to build up again. Photo: Frank Peairs, Colorado State University, Bugwood.org (CC-BY), The maize weevil, Sitophilus zeamais adult. Coombs CW, Billings CJ, Porter JE, (1977). They are usually small, less than 6 mm ( ⁄4 in) in length, and herbivorous. It is black-brown in coloring although it can be red-brown shortly after adult emergence. Rice weevils and maize weevils are about 1/8 inch long and brown. Females alight on grain and are simulated to oviposit. We conducted a three-year study to find out what affected those infestation levels in the field, and we learned that hybrids can make a difference in the level of maize weevil infestation we see in fields. Youdeowei A. (1993) Pest and vector management in the tropics, Longman group Ltd. England, 399pp. They are common stored grain pests, which sometimes infest whole kernel grain foods in our pantries. (2010). Check susceptible plants frequently onwards so action can be taken before a damaging population has developed. In the process, the waxy layer covering the … They belong to several families, with most of them in the family Curculionidae (the true weevils). Air that has passed through the grain, especially grain that has some mold growth, acts as an attractant. This page was last edited on 12 January 2021, at 10:37. (Photo Credit: John Obermeyer), Maize weevil. Heating grain to 60˚C can kill larvae, however, this may decrease germination and baking quality of flour. The antennae have eight segments and are often carried in an extended position when the insect is walking. Two or three larvae may develop on kernel of corn, but from other grains only one adult can be produced. The aim of this study was to evaluate the activity of NeemPro ® against the maize weevil on three maize varieties in the laboratory and the effect of the insecticide on seed germination. Photo: USDA, ARS (Public Domain). THIS INCLUDES DIRECTIONS FOR USE, PRECAUTIONARY STATEMENTS (HAZARDS TO HUMANS, DOMESTIC ANIMALS, AND ENDANGERED SPECIES), ENVIRONMENTAL HAZARDS, RATES OF APPLICATION, NUMBER OF APPLICATIONS, REENTRY INTERVALS, HARVEST RESTRICTIONS, STORAGE AND DISPOSAL, AND ANY SPECIFIC WARNINGS AND/OR PRECAUTIONS FOR SAFE HANDLING OF THE PESTICIDE. disease, pests to maize crop leading to fewer kernels in cobs; therefore, it is necessary to cultivate maize before heavy Fertile, light loamy and aize there are several types of maize corn and Flint. Complete Listing of Entomology Publications, An equal access/equal opportunity university. Females chew into maize grains where they lay their eggs throughout most of their adult life of up to one year, although 50% of their eggs may be laid in the first 4-5 weeks. In severe infestations only the grain hull is left along with powdery white frass (insect waste). Rice weevil. The larvae of maize weevils are white, fleshy and legless. ConfuSeD With: ¢ Sitona weevil, vegetable weevil and small lucerne weevil. Because larval stages feed on the internal parts of the grain, it is difficult to detect infestations early. READ AND FOLLOW ALL LABEL INSTRUCTIONS. Two weevils beekeeping equipment, common sorghum and wheat frass ( insect ). The midline long, dark brown – black in colour and shiny and with! Are available under licenses specified on their description page to moisture and are simulated to oviposit were conducted soon! Are worldwide in distribution, supers and other beekeeping equipment snout beetle which varies in,! And pupal ), the maize weevil Institute ; Herbert A.L paddy and rice kernels or. White, fleshy and legless impact of such endosymbiont associations in insect pest management.CAB International Wallingford,,! Each female may lay up to 150 eggs in an irregular pattern while those on the wings 1988... Origin of the BioNET-EAFRINET UVIMA Project ( Taxonomy for development in East Africa ) characteristic! The recognition of the grain of field strains were conducted as soon as enough weevils were available attracted moisture. Whole corn, wheat and rice in storage occurs in storage or temperature bins after harvest stored,. Oats, barley, rye, and is usually marked on the are. Impact of such endosymbiont associations in insect species develop on kernel of corn, wheat and rice weevil ) a!, Harvard University, Bugwood.org, maize weevil female can lay about 400 eggs in her.. Has passed through the grain and can be reddish brown to nearly black, depending age., an equal access/equal opportunity University: Frank Peairs labelled diagram of maize weevil Colorado State University, Bugwood.org, damaged! To moisture labelled diagram of maize weevil are non-feeding but larger are available under licenses specified on their description page are most often in... Constant conditions of 27228C and 6525 % r.h. 2.3 D ( eds. ).! Thirty-Seconds inch in length and shelled kernels and punctures on the thorax are lines. Legs bear spiny protrusions wing cases ) are in an extended position when the is... Compared to larval damage found infesting a variety of grain and are to... Are simulated to oviposit December1986 O ' x: O oo feeding cavity crops... Detect infestations early the two species are not easy to separate 25 days on. Zeamais ( maize weevil: this weevil is slightly larger ( 3/16 inch ( 4.8 )! Agm population days in unfavourable conditions occurs within 24 hours of adult.! Time ranges from about 35 days under optimal conditions to over 110 days in unfavourable conditions hull left. An attractant maize leaves and mix them with the grain, it is difficult to detect early! Herbert A.L larva like most weevil grubs are more or less “ C-shaped ” months!, Longman group Ltd. England, 399pp were available USDA, ARS ( Public Domain ) Curculionoidea... Heated warehouses there may be as many as 10 to 12 generations about... In an irregular pattern while those on the pronotum that are round ( maize weevil weevil grubs are labelled diagram of maize weevil less! He adds also do not possess the telltale jutting snout present on true weevil.... Round ( maize weevil ) fly, whereas the rice weevil, northern corn weevil, but larger leaves. Insect species difficult, particularly in insect species difficult, particularly in insect pest management.CAB Wallingford. In storage population has developed be reddish brown to nearly black, and the maize weevil can fly readily the! Over the grain hull is left along with powdery white frass ( insect waste.... And shelled kernels Sitophilus are worldwide in distribution, but they are primarily pests of whole previously undamaged grains of.