Polish Journal of Entomology (Polskie Pismo Entomologiczne) (2005) 74, 61-72

D.R. Thakur and H.S. Banyal (2005)
Development and larval morphology of Callosobruchus theobromae (L.) (Bruchidae: Coleoptera)
Polish Journal of Entomology (Polskie Pismo Entomologiczne) 74, 61-72
Abstract: The life cycle of Callosobruchus theobromae (L.), a pest of the legume Dolichos lablab (L.), was observed. Its incubation period was 6.7±0.67 days under controlled laboratory conditions. First-instar larvae hatched out from the ventral surface of eggs and bored into the wall of the pod or testa of the seed to reach the seed contents. The entrance hole on the seed was small and plugged due to accumulation of larval frass. Freshly emerged first-instar larva was minute and measured 0.566±0.04 mm in length and 0.304±0.04 mm in width. Larvae had a well-developed, dark brown, prothoracic retracted prognathous head provided with usual mouthparts, including dark brown, highly sclerotized, equal-sized mandibles and an H-shaped plate on the prothorax. Larval and pupal development was completed inside the host seed. Last-instar larva was comma-shaped, measuring 3.712±0.36 mm in length and 1.884±0.14 mm in width. Pupa took 6.1±0.73 days to transform into an imago and the adult insect cut a circular window to emerge. The life cycle was completed in 31.4±2.11 days at 30-35°C and 86-98% humidity.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Callosobruchus theobromae	Hyacinth bean (Lablab purpureus)	India