Pests. Acanthoscelides obtectus Say – Bean Weevil. Object map. Systematic position. Class Insecta, order Coleoptera, family Bruchidae, genus Acanthoscelides. Size: mm. Basic colour: Brown Pattern colour: Darker spots scattered, sometimes paler longitudinal streaks. Number of spots: Numerous small dark spots. Citation: Walker, K. () Bean weevil (Acanthoscelides obtectus) Updated on 1 /25/ AM Available online: PaDIL.

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Ecological features of bean weevil and basis for control measures. The species is very sensitive to temperatures below zero. Young cylindrical white larvae have bristles and 3 pairs of legs. They are generally considered a pest species for this reason. Bean weevils develop and feed upon acanthoscelldes plants. About ecology and harming activity of bean weevil Acanthoscelides obtectus Say in Armenian conditions. Cajanus cajan pigeon pea. Bean weevils feed on vetchesbeans and other leguminous plants.

New pest of haricot-bean Acanthoscelides obtectus Say in Stavropol’ area. Continuing to use www. In other projects Wikimedia Commons Wikispecies.

The femur of the hind leg has three tooth-like spines. At first they feed on vetch, peavine, lupin, alfalfa, and other leguminous cultures; they then move on to haricot bean, bean, soybean, lentils.

Cultural Control and Sanitary Methods Good store hygiene plays an important role in limiting obtecths by this species. Obtedtus cycle of one generation takes days.


Originating in Central America they have been inadvertently spread around the world in grain shipments. Partially damaged grains lose their germinating power and taste quality.

Sometimes it is observed in the southern part of West Siberia. American naturalist Thomas Say named the bean weevil species as Acanthoscelides obtectus in Knowledge Bank home Change location.

Acanthoscelides obtectus Scientific classification Kingdom: Plant protection against agricultural pests, diseases, weeds in Pskov region Proc.

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Good store hygiene plays an important role in limiting infestation by this species. Oblong egg is white, about 0.

They acabthoscelides usually found in dried kidney and haricot beans. Zashchita i karantin rastenii Admixture of approved grain insecticides, especially organophosphorous compounds, will protect against this pest.

AgroAtlas – Pests – Acanthoscelides obtectus Say – Bean Weevil

White pupa is about 4 mm in length. The insect produces a sweet, “fruity” pheromone that gives cultures of newly emerged adults a pleasant smell. It was transferred with grain to Europe in the end of Nineteenth century; in the s it was brought to Crimea.

acanthoscelidse Acanthoscelides obtectusthe bean weevilis a species of beetle. The pest also migrates to grain fields. Several larvae can develop in one grain to Acanthoscelides obtectus Say Chemical Control Due to the variable regulations around de- registration of pesticides, we are for the moment not including any specific chemical control recommendations.


The removal of infested residues from last season’s harvest is essential.

See Department of Agriculture, Western Australia weblink. The bean weevil is a significant pest in some parts of the world, especially in areas such as Australia where it is non-native.

Bean weevil

The wing cases are short and mottled brown with the antennae being grey and reddish. It has been recorded on a number of other legumes, including cowpeas in Mexico, chickpeas and Voandzeia subterranea, but it seldom attains pest status on acanghoscelides hosts.

EU pesticides database www. A number of parasitoid wasp are associated with the bean weevil larvae. Diagnostic Notes Grey-green in colour and about 3 – 5 mm long. This limits the species to how far north it can spread, and is found only as far north as northern Lithuaniawith some being found in south-west Siberia.

By using this site, you agree to the Terms of Use and Privacy Policy. Larvae are white with a yellow head during their first instar and white with a brownish head from the second instar. From Wikipedia, acanrhoscelides free encyclopedia.