It varies from a dull red-brown to black, and is usually marked on the back with four light red to yellow spots. The simplest and most effective measure is to locate the The size is the only difference I can see between the two, although from what I read there are other differences - I just can't see it. If the problem (1996) serves as a template for this study. insects from entering the grain on the surface. source of infestation and quickly get rid of it. (Throne and Eubanks, 2002), adult female weevils excavate shallow pits in the seed coat. Exposed adults. ), This page was last edited on 16 September 2020, at 11:07. After the bin is cleaned, and all needed repairs have been made, the in Yugoslavia. Treatments can be sarah in the woods 6 years ago. [7] This species has also been recorded in Canada, in the provinces of Ontario and Quebec,[6] and has been intercepted at ports, but is not well established there. Common Name(s): Maize weevil, Rice Weevil Description. 328). Maize weevils in the Jomon period were 1.25–1.30 times larger than ancient and medieval specimens, as well as modern populations of maize weevils that infest rice grains (Obata et al., 2011). [9][10][11][7], S. zeamais occurs throughout warm, humid regions around the world, especially in locations where maize is Sitophilus zeamais appears similar to the rice weevil(Sitophilus oryzae), but has more clearly marked sp… hatches in a few days into a soft, white, legless, fleshly grub which insecticides to get the control job accomplished safely. As the name implies, they like maize (corn). With regards to the tobacco beetle, no information was found on the effects of EPF on the insect; this study will therefore serve The maize weevil is very similar to the rice weevil, Sitophilus oryzae (see Fact Sheet no. If you detect an New characters to distinguish larvae and adults of the two sibling species: Sitophilus oryzae(L.) and S. zeamais Mots. The type of food consumed by the larvae influences the size of the adult (3.9-4.9 mm on corn, 3.0-4.6 mm on wheat, 2.9-4.3 mm on rice, 2.7-3.2 on rough rice, and 2.3-3.9 mm on shelled rice). The larvae will pupate while inside, then chew a circular exit hole,[1] and emerge as an adult beetle. Maize weevil body size from YSD 0003. After the grain [6] The plug quickly hardens, and leaves a small raised area on the seed surface. checked at two week intervals during warm months and at one month It infests raw or processed cereals such as wheat, oats, barley, sorghum, rye and buckwheat. As S. zeamais larvae feed on the interior of individual grains, often leaving only the hulls, a flour-like grain dust, mixed with frass is evident. [3] This species attacks both standing crops and stored cereal products, including wheat, rice, sorghum,[4][5][6] oats, barley, rye, buckwheat,[6] peas, and cottonseed. The two species look almost identical without magnification. Proctor, D.L. Maize weevil Sitophilus zeamais (Motsch. Both adults and larvae feed 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. Infested grains contain holes through which adults have emerged. for garbage removal, or bury deep in the soil. light reddish or yellowish spots. One study recorded, 5 weeks after infestation, the emergence of 100 adults per kg per day. Maize weevil body size from YSD 0003. Insect resistant maize: recent advances and utilization. 3 mm) and it is capable of flight. rice weevil is probably the most insidious, owing largely to the. The rate of development Meikle, W.G., Holst, N., Markham, R.H. 1999. 1973. Adults can live for 5 to 8 months. [2] Breeding conditions require temperatures between 15 and 34 °C and[vague]40% relative humidity. The reddish markings on the wing covers are more clearly defined. They have densely spaced pits on the pronotum that are round (maize weevil) or elongated (rice weevil). treated. Infestations can start in the field. use. The maize weevil has fully developed wings … packages. Journal of Stored Products Research, 39(2): 225–235. is binned and leveled, a surface dressing can be applied to prevent The type of food consumed by the larvae influences the size of the adult (3.9-4.9 mm on corn, 3.0-4.6 mm on wheat, 2.9-4.3 mm on rice, 2.7-3.2 on rough rice, and 2.3-3.9 mm on shelled rice). Peng, W.K., Lin, H.C., Wang, C.H. These weevils are very destructive grain pests. However, the only reliable features to distinguish adults of both species are on the genitalia (see table below). Prevention is the best strategy; but if resistance is maize weevil, the literature shows that this insect has previously been shown to be susceptible to infection by Beauveria bassiana isolates and the study by Adane et al. (Coleoptera, Dryophthoridae). applied as the grain is loaded into the bin through the use of a is slightly slower for the maize weevil than for the rice weevil. Danho, M., Gaspar, C., Haubruge, E. 2002. "First confirmation of the distribution of rice weevil, USDA study on temperature management of the maize weevil, USDA study on contest behaviour of maize weevil larvae when competing within seeds, African Journal of Biotechnology: Laboratory evaluation of four medicinal plants as protectants against the maize weevil, https://en.wikipedia.org/w/index.php?title=Maize_weevil&oldid=978686372, Short description is different from Wikidata, All Wikipedia articles needing clarification, Wikipedia articles needing clarification from January 2014, Creative Commons Attribution-ShareAlike License, Punctures on pronotal dorsum typically nearly circular, rarely elliptical, Longitudinally elliptical punctures on pronotal dorsum, Pronotal punctures are nearly equally spaced apart, and pronotum typically has no median puncture-free area (rarely has a narrow puncture-free median zone), Pronotal punctures are separated by a flat, median, longitudinal puncture-free zone, More than 20 pronotal punctures along the approximate midline, running from neck to scutellum (not reliable for individuals not reared on corn, which are typically smaller), Less than 20 pronotal punctures along the approximate midline, running from neck to scutellum, Scutellar elevations typically farther apart compared to their longitudinal length, Scutellar elevations typically closer together compare to their longitudinal length, Scutellar elevations typically extend longitudinally approximately halfway down the scutellum, Scutellar elevations typically extend longitudinally approximately more than halfway down the scutellum, Proepimera meets behind the fore coxae and has a barely discernible notch along the posterior edge at the site of the meeting point, Proepimera meets behind the fore coxae and along the posterior edge, has a distinct notch along the posterior edge at the site of the meeting point, Male aedeagus has two dorsal, longitudinal grooves, Male aedeagus is smooth and shiny on the dorsal surface, Epipharyngeal rods of larvae tapering apically, Epipharyngeal rods of larvae have virtually the same width throughout, Lateral lobes of Y-shaped sclerite of female genitalia tapering and pointed at apex, Lateral lobes of Y-shaped sclerite of female genitalia not tapering and rounded at apex, More than 5 sensory organs at the tip of the labial palps of larvae, Less than 5 sensory organs at the tip of the labial palps of larvae. They have densely spaced pits on the pronotum that are round (maize weevil) or elongated (rice weevil). They are mostly brown to black in color and can have spots on their thorax and abdomen. eulalia, Thanks for the clue. It has a long, thin snout, and elbowed antennae. The most obvious sign of infestation is the emergence of adults. The use of insecticides is discouraged around food Nardon, C, Nardon, P. 2002. The only way to control these pests is fumigation. This small, brown weevil has four reddish-brown spots on the wing covers (elytra). The complete development time for the life cycle of this species averages 36 days.

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