bean weevil

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bean weevil,

common name for a well-known cosmopolitan species of beetle (Acanthoscelides obtectus) that attacks beans and is thought to be native to the United States. It belongs to the family Bruchidae, the seed beetles. The bean weevil is small, about 1-6 in. (0.4 cm) long, and stout-bodied, with a short broad snout and shortened wing covers (elytra). The adults attack legumes either in storage or in the field and may even completely destroy them. The grubs, or larvae, hatch from eggs laid in holes that have been chewed by the female into stored beans or into pods in the field. In heavy infestations there may be two dozen or more newly hatched larvae in one bean. When full-grown, the larvae form pupae in the eaten-out cavity. As many as six generations are produced in a single season, and in storage breeding continues as long as there is available food left in the beans and a warm temperature. The larvae can be killed by fumigation or by heating the seeds to 145°F; (63°C;) for two hours. Bean weevils are classified in the phylum ArthropodaArthropoda
[Gr.,=jointed feet], largest and most diverse animal phylum. The arthropods include crustaceans, insects, centipedes, millipedes, spiders, scorpions, and the extinct trilobites.
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, class Insecta, order Coleoptera, family Bruchidae.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Bean Weevil


(Acanthoscelides obtectus), a beetle of the family Bruchidae that infests leguminous crops. The body is oval and measures 2–5 mm in length. The coloration is copper brown, except on the abdomen and the tips of the elytra, which are yellowish red.

Bean weevils appear when the bean plants finish blooming and the pods begin to ripen. They reproduce in the field and in storehouses at a temperature of 13°–31° C. The female deposits the eggs (an average of 45) in clusters in the cracks of dried pods or on or between the seeds. Within four days the larvae move about freely and penetrate the seeds, where they develop, pupate, and become beetles. The developmental cycle of the bean weevil takes 34–60 days, depending on the temperature. Under normal conditions it dies after producing three or four generations.

The bean weevil is found in Western Europe and the USSR, primarily in Transcaucasia, Krasnodar Krai, and the Ukrainian SSR. It infests beans and, to a lesser extent, chick-peas, vetchlings, peas, lentils, broad beans, and soybeans. The damaged seeds are inferior in nutritional value and sowing quality.

Control measures include the sowing of uninfected seeds, the chemical treatment of the plants when the pods are ripening, postharvest plowing, disinfection of storehouses, fumigation of food and seed beans with pesticides, and the refrigeration and freezing of infested beans or the heating of seeds to a temperature of 18° C for 20 minutes.


Brudnaia, A. A. Bor’ba s vrediteliami zernobobovykh kul’tur. Moscow, 1963.
Zakladnoi, G. A., and V. F. Ratanova. Vrediteli khlebnykh zapasov i mery bor’by s nimi. Moscow, 1973.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Biosystematics of the Arizona, California and Oregon Species of the Seed Beetle Genus Acanthoscelides Schils ky (Coleoptera: Bruchidae).
Classification and comparative biology of the seed beetle genus Caryedes Hummel (Coleoptera: Bruchidae).
Bruchidius siliquastri was newly recorded in France as a seed beetle of C.
In this study we recognized that these seed beetle species are very specialized to their host plants, because we did not find Bruchidius siliquastri in Albizia julibrissin seeds nor B.
Top-down, bottom-up, and horizontal mortality variation in a generalist seed beetle
Population differences in host use by a seed beetle: Local adaptation, phenotypic plasticity y maternal effects.
Female seed beetles look as if they have genuine cause to minimize mating.
For example, as females of the seed beetle Callosobruchus maculatus age, they begin laying smaller eggs.
However, the effect of seed beetle on the germination of host legume can be unpredictable [23].
Johson (1990) carried out the systematic studies on the seed beetle genus, Acanthoscelides and reported 103 species from North-South America.
Professor Goran Arnqvist from the Department of Ecology and Evolution, Uppsala University and associate professor Trine Bilde from the Department of Biological Sciences, University of Aarhus, tested this possibility directly for the first time using seed beetles and shown that it is not true.
In the seed beetle Stator limbatus (Coleoptera: Bruchidae), there is substantial variation in body size both within and among populations.