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Species Page

bean bruchid

Acanthoscelides obtectus
This information is part of a full datasheet available in the Crop Protection Compendium (CPC);www.cabi.org/cpc. For information on how to access the CPC, click here.

Distribution

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Host plants / species affected

Main hosts

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Cajanus cajan (pigeon pea)
Phaseolus (beans)
Phaseolus lunatus (lima bean)
Phaseolus vulgaris (common bean)

List of symptoms / signs

Seeds - internal feeding

Symptoms

Larvae and pupae develop entirely within grain legumes. Adults emerge through a window cut in the testa, so heavy infestation can result in a large number of holed seeds, with adults moving across the stored commodity.

Prevention and control

Cultural Control and Sanitary Methods

Good store hygiene plays an important role in limiting infestation by this species. The removal of infested residues from last season's harvest is essential. When small lots of beans are stored, daily turning of the storage container can significantly reduce infestation.

Chemical Control

Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources:

Impact

A. obtectus is a serious pest of common beans (Phaseolus vulgaris) and lima beans (Phaseolus lunatus). 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 these hosts.