International Science Community Association Research Journal of Agriculture and Forestry Sciences 14 2 2026 04 8 Biology of Callosobruchus chinensis in stored Pigeon Pea (Cajanus cajan) in Muzaffarpur, Bihar, India 9 13 EN I. Amadi 1 Department of Environmental Forestry and Wildlife Management, University of Port Harcourt, Nigeria A.S. Ogunbode 2 Department of Environmental Forestry and Wildlife Management, University of Port Harcourt, Nigeria Kumariq Pinki 1 Department of Zoology, Mahant Darshan Das Mahila College, Muzaffarpur, Bihar – 842002, India Gupta Pragati Kumari 2 Department of Zoology, Maharani Janki Kunwar College, Bettiah, Bihar – 845438, India Gupta Archana 3 Department of Zoology, Mahant Darshan Das Mahila College, Muzaffarpur, Bihar – 842002, India > Research Paper 2025 12 2 2026 04 8 Pigeon pea (Cajanus cajan) commonly known as Arahar, is the major pulse crop cultivated all over India. Pulses are important high protein foods for the vegetarian & good nutritious sources of vitamins and minerals too. But it suffers high percentage of damage during storage when compared to other grains because they are highly prone to pulse beetle infestation. Among major pests, Callosobruchus chinensis, is a catastrophic pest of various pulses like arhar, moong and chana. Before spreading infestation may begin from the fields. The growth and developmental stages of pest include eggs, larvae, pupae and adults. The total development period varied slightly different during season of the year. The wt & size of grain also influences the no. of eggs deposited by the female pulse beetle Present work was done to observe the biology of the pulse beetle on pigeon pea in laboratory on eleven different parameters. The results indicate that the average pre-oviposition period was 6.50 ± 00.70 hours, the oviposition period was 6.80 ± 1.04 days, and the post-oviposition period was 2.60 ± 0.52 days. The incubation period averaged 4.90 ± 0.86 days. Each female laid an average of 92.70 ± 11.34 eggs, of which 80.50 ± 08.61 successfully hatched. Percentage egg hatchability was 87.05±04.08. The total larval period averaged 15.10 ± 1.67 days, while the pupal period averaged 6.00 ± 0.93 days. The complete life span was completed within 32–40 days in females and 31–36 days in males. These findings are significant not only for understanding the developmental biology of the pulse beetle but also for devising effective control strategies. Copyright@ International Science Community Association