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Bean weevil

Bean weevil

Acanthoscelides obtectus

A species of Acanthoscelides, Also known as Bean seed beetle, Dried bean weevil, Bean bruchid

Acanthoscelides obtectusare small beetles, ranging in size from 2 - 5 mm. They range in colour from light to dark brown, with longitudinal spots on their elytra, which has a red posterior border. Eleytra does not cover the abdominal end. Legs are yellow red and antenna red brown. The head is bent forward and lacks the long snout that is characteristic of true weevils. Eggs are milky white. Larvae are white with a yellow head during their first instar and white with a brownish head from the second instar. Larvae have bristles and three pairs of legs.

General Info About Bean weevil
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Attributes of Bean weevil
Colors
Brown
Gray
Habitat
beans store
Adult Food Sources
Common beans (phaseolus vulgaris), other legume seeds
Larva Food Source
Seeds of legumes, particularly phaseolus spp. (common beans)
Biting/stinging
Not reported
Allergy-causing
Not reported
Defensive attack
Not reported
Venomous
Not reported
Non-poisonous
The Bean weevil is non-toxic and generally doesn't pose a risk to human health. No need for excessive worry.
Borer
Not reported
Biting animal or pet
Not reported
Mouthparts Type
Chewing mouthparts
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Adult Size of Bean weevil
2 - 4 mm
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Predators of Bean weevil Larvae
Frogs, toads, birds, jumping spiders, mantises
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Predators of Adult Bean weevil
Birds, small mammals, reptiles, spiders, predaceous insects
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Interesting Facts About Bean weevil
The bean beetle, bean weevil, practices precise egg-laying, with females choosing the healthiest beans, which ensures the best nutrition and survival rate for their larvae.
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Scientific Classification of Bean weevil
Tips for Finding Bean weevil
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Youth Habitat of Bean weevil
Agricultural and Cultivated Areas, On and Within Other Organisms
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Adult Habitat of Bean weevil
Agricultural and Cultivated Areas
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How Can You Attract Bean weevil
Beans or legumes as they are known to infest these types of stored products.
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Habitat Preferences of Bean weevil Through Different Life Stages
Eggs of bean weevil are typically deposited on the surface of their primary food source, dried beans, often found in storage facilities or pantries. The larvae bore into these beans to develop, feeding on the interior. Upon reaching maturity, they leave the beans to pupate in the immediate vicinity, usually within the debris at the bottom of the storage container. To locate all stages, thoroughly inspect stored beans and pulses, watch for damage or exit holes in the beans, and examine storage containers' residues. Look for the adult bean weevil in the same storage areas or nearby, as they don't tend to travel far from their food source.
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When is the Best Time to Observe Bean weevil
Morning or evening when temperatures are cooler as bean weevil are less active and easier to spot.
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What is the Best Weather to Observe Bean weevil
Dry conditions are preferable as bean weevil thrive in low-humidity environments often found in stored food facilities.
Are Bean weevil harmful?
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Usually, the bean weevil won't threaten or hurt humans. But remember that even a worm will turn. Remember to still be cautious.

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Are Bean weevil harmful to humans?

Some colorful leaf beetles are actually toxic, and their beautiful appearance is warning predators: I am very dangerous, do not eat me! However, just observing with your eyes and touching the leaf beetle with your hand will not be poisoned.
Harmful Effects of Bean weevil
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Stored Produce Pest

Bean weevil poses a severe threat to stored legumes. Adults lay eggs on dry pulses, and the emerging larvae burrow inside the beans, causing internal damage. This not only results in significant product loss but also lowers the market value. Infestations can lead to total loss of the affected stock, posing great challenges in maintaining the quality of stored legumes. Control measures are essential to prevent economic losses due to this pest.

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Agricultural Pests

Bean weevil's larvae pose a significant threat to bean crops by boring into seeds, which can lead to mild to severe damage. Infested seeds may show poor germination and reduced vigor, affecting yield. In severe infestations, crop losses can be substantial. The direct impact on food supply and economic consequences for farmers are potential human concerns.

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Hurt Plant

Bean weevil, in both adult and larval stages, attacks the seeds of plants, leading to reduced seed viability and potential crop loss. The extent of damage can range from mild to severe, based on insect numbers.

More Effects of Bean weevil

Common Questions People Also Ask
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