Genetic Studies on a Ladybird Beetle from Bangladesh

ISBN-13: 9783330042841 / Angielski / Miękka / 2017 / 172 str.

M. Saiful Islam; Kamrul Islam

Opis

Genetic studies of a predominant ladybird beetle species Epilachna vigintioctopunctata Auctt. (Coleoptera: Coccinellidae) of Bangladesh were conducted to evaluate oviposition period, egg-laying, egg-hatch, incubation period, larval and pupal durations, adult emergence, female ratio and longevity of the male and females. Polygenic inheritance of spot patterns of the beetle suggested a dominance relationship of 12 28 20 spots. Cross-matings between beetles from Rajshahi, Khulna and Sylhet regions showed no incompatibility. Cytogenetics revealed 2n=18 chromosomes, and the mean total length of the beetle genome was around 32µm. LC50 values of the aqueous leaf extracts of three plant species Ricinus communis L., Calotropis procera (Ait.), and Datura metel L. against the 3rd instar larvae of the beetle were 18.40mL/250mL, 23.70mL/250mL and 29.61mL250mL, respectively. The plant extracts had highly significant effects on egg-laying, egg-hatch and larval duration (P

O autorze

Dr. M. Saiful Islam, Professor, Dept of Zoology, University of Rajshahi, Bangladesh; research interests include genetic control of pest insects; Dr. Kamrul Islam, Associate Prof, Department of Genetic Engineering & Biotechnology, Shahjalal University of Science and Technology, Sylhet, Bangladesh; interested in genetic studies on invertebrates.