The adult beetles live up to two weeks after emerging from the pupa.Temperature has been shown to alter this behavior in adult beetles.
They may consume nearly the entire bean contents. Scientific Name Acanthoscelides obtectus Scientific Author (Say, 1831) Taxonomy (Coleoptera: Chrysomelidae: Bruchinae) Status Exotic Species Outbreak in Australia Reliability High Download PDF.
The adults do not require food or water and spend their limited lifespan (one – two weeks) mating and laying eggs on beans. Damage.
The grub, or larva, is whitish and hairy. The wing cases are short and mottled brown with the antennae being grey and reddish. Page menu options: Main ; Other Names; Commodity Type; Distribution; References; Web Links; Diagnostic Images.
The larval stage of the weevil pests of dry beans tunnel and develop within bean seeds.
The size of the weevils is usually small less than 6 mm and these are herbivores.
They are usually found in dried kidney and haricot beans. Bean Weevil— is the scientific name of The bean weevil (Acanthoscelides obtectus) the farmers’ scourge. Mature adults emerge from the bean, biting a neat circular exit from the pod as soon as 25 days after hatching.
They reach the height of egg production and legume infestation in July–August.This species exhibits some sexual dimorphism where the female is larger and heavier than the male beetle. This species also is known as the southern cowpea weevil.
Dorsal view Caption Mauritius Oct 2002 ex dried peas. The eggs are whitish and ellipsoidal, and are laid in loose groups in the holes chewed in the pod along the seam or in cracks.
The antennae are pectinate in males while in females, the antennae are serrate.The Adzuki bean weevil females lay their eggs directly on the surface of the legume singly and move on to either a different part of the legume or else to a different one depending on the bean density and The larvae chew tunnels through the bean until it is ready to pupate.
The name Araecerus fasciculatus (DeGeer 1775) is resurrected for the coffee bean weevil, with the following synonyms: Bruchus cacao Fabricius 1775, Bruchus peregrinus Herbst 1797, Bruchus capsinicola Fabricius 1798, Anthribus coffeae Fabricius 1801, Amblycerus japonicus Thunberg 1815 (probably a synonym), Anthribus alternans Germar 1824, Phloeobius griseus of Stephens 1831, not … Pupation occurs in the beans and adults emerge through a round hole in the seed coat. As temperatures rise, this behavior becomes less common. Bean weevil: eggs laid loosely among beans or through cracks in the pods; The larval and pupal stages are spent inside the bean.
The larvae of this species feed and develop exclusively on the seed of legumes (Fabaceae) hence the name bean beetle. The scientific name of the weevil is Curculionoidea.
Although it is commonly known as the adzuki bean weevil it is in fact not a true weevil, belonging instead to the leaf beetle family, Chrysomelidae.Other common names include the pulse beetle, Chinese bruchid and cowpea bruchid. The insect produces a sweet, "fruity" pheromone that gives cultures of newly emerged adults a pleasant smell. Grey-green in colour and about 3 - 5 mm long. The physical appearance of the weevil is based on the species. There is a total 97000 species in the various families in which mostly species belong to the Curculionidae. Bean weevil. Dorsal view
Wheat Weevil—Commonly called the granary weevil, the wheat weevil (Sitophilus granarius) holds notoriety for its destructive potential in agriculture.
Callosobruchus chinensis is a common species of beetle found in the bean weevil subfamily, and is known to be a pest to many stored legumes. The bean weevil is a significant pest in some parts of the world, especially in areas such as Australia where it is non-native. It damages crops both in situ and when stored in warehouses, and can potentially reduce crop yields by 60% as the larvae develop at the expense of the seeds. The femur of the hind leg has three tooth-like spines. They have a 'tear drop' like body shape and are covered in short hairs. The scientific name of the coffee bean weevil and some additional bibliography (Coleoptera: Anthribidae: Araecerus Schönherr) Barry D. Valentine Museum of Biological Diversity The Ohio State University Columbus, Ohio 43212 bv@nwcs.com Abstract. Technically, they belong to the cadre of seed beetles and are not true weevils.
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