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Adzuki bean seed beetle

Adzuki bean seed beetle

Callosobruchus chinensis

A species of Callosobruchus, Also known as Adzuki bean weevil, Southern cowpea weevil, Oriental cowpea bruchid, Cowpea beetle

C. chinensis is a small insect, growing to be about 5 mm in length as an adult. Unlike true weevils, C. chinensis has no snout. The adult stage is described as being brown in colour with black and grey patches over the body. The abdomen of the female is slightly longer than the elytra and it is white in colour with two oval black spots on it. The adults are capable of flight and they can disperse to other fields and bean storage sites easily using this method. This species exhibits some sexual dimorphism where the female is larger and heavier than the male beetle. The antennae are pectinate in males while in females, the antennae are serrate. The larvae are yellowish-whitish in color with reduced legs. The pupae are dark brown and pupation occurs inside the legume. The eggs occur singly and have a yellow coloring which become opaque when hatched. Their eggs become much smaller in areas of high population density to accommodate for competition of resources in the legume which results in smaller adults and less fit larvae.

General Info About Adzuki bean seed beetle
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Attributes of Adzuki bean seed beetle
Adult Food Sources
Pollen, legume seeds, chickpeas, cowpeas, lentils
Larva Food Source
Legume seeds, chickpeas, cowpeas, lentils, beans
Biting/stinging
Not reported
Allergy-causing
Not reported
Defensive attack
Not reported
Venomous
Not reported
Non-poisonous
Not reported
Borer
Not reported
Pollinator
Not reported
Pest-Eating Predatory
Not reported
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Life Cycle of Adzuki bean seed beetle
Egg The adzuki bean seed beetle begins as an egg, typically ovoid or round, and minute. During this stage, the embryo develops inside the protective casing until hatching.
Larva Once hatched, the adzuki bean seed beetle larva is worm-like, often with a soft exoskeleton. It's a feeding stage, with the larva growing rapidly and molting several times.
Pupal After the larva reaches a certain size, it enters the pupal stage. Encased in a pupal shell, the adzuki bean seed beetle undergoes significant transformation, rearranging into the adult form.
Adult Emerging from the pupa, the adult adzuki bean seed beetle's development is marked by the presence of wings and functional reproductive organs. The body is fully formed and hardened, and the adult is mobile, focusing on reproduction.
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Predators of Adzuki bean seed beetle Larvae
Ants, spiders, wasps
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Interesting Facts About Adzuki bean seed beetle
Adzuki bean seed beetle can lay more than 100 eggs in their short lifespan, and their larvae bore into beans where they grow in concealed safety.
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Scientific Classification of Adzuki bean seed beetle
Tips for Finding Adzuki bean seed beetle
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Adult Habitat of Adzuki bean seed beetle
Agricultural and Cultivated Areas, Urban and Suburban Areas
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Habitat Preferences of Adzuki bean seed beetle Through Different Life Stages
Eggs of adzuki bean seed beetle are typically found on the seeds or pods of legumes, which are their primary food source; searching for them may involve examining these plants. Larvae reside inside the legume seeds, often requiring seed dissection to be observed. Pupation occurs within the same seed, thus inspection of legume seeds is crucial at this stage too. The adults emerge from seeds and are commonly found on or near the host plants. To locate adults, one would search on or around legume plants in agricultural areas or stored product facilities where these seeds are kept.
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Are Adzuki bean seed beetle 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 Adzuki bean seed beetle
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Stored Produce Pest

Adzuki bean seed beetle larvae can have a severe impact on stored dry produce such as grains and beans. They bore into these items to feed and develop, causing significant loss in weight and nutritional quality. This results in substantial economic losses for producers and processors. Infestation can further lead to contamination with larval excrement and secondary pests, complicating storage and increasing management costs.

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Agricultural Pests

Larvae of adzuki bean seed beetle severely bore into the seeds of bean crops, diminishing the plants' reproductive capability. With a high number of pests, seed viability is massively reduced, leading to significant yield losses. Human concerns include decreased food security and increased control costs.

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Hurt Plant

Adzuki bean seed beetle larvae bore into seeds of legumes, consuming the seed contents. This causes severe damage, impeding germination and weakening seedling vigor, often leading to significant crop loss.

More Effects of Adzuki bean seed beetle

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