| Abstract: |
Stored pulses constitute a vital source of dietary protein across the developing world, yet their post-harvest value is severely compromised by infestation from bruchid beetles, principally Callosobruchus maculatus (Fabricius) and Callosobruchus chinensis (Linnaeus). This review synthesises the published literature on the developmental and infestation stages of these two species and critically appraises the spectrum of treatments developed to suppress them. Drawing on a structured survey of work spanning several decades, the paper examines the holometabolous life cycle egg, four larval instars, pupa and adult and clarifies the distinction between latent field infestation, in which oviposition begins on maturing pods, and the explosive multiplication that follows under storage conditions. The concealed feeding of larvae within the seed cotyledon, the production of characteristic circular emergence windows, and the consequent losses in seed weight, germinability and nutritional quality are documented in detail. The survey collates evidence on physical interventions such as solar heating, cold storage, hermetic and modified-atmosphere systems and irradiation; on chemical fumigation and insecticidal treatment; on botanical preparations including plant oils, inert seed coatings, leaf powders and essential oils; on biological control through hymenopteran parasitoids; and on host-plant resistance. A meta-analytic reading of reported efficacy reveals considerable heterogeneity attributable to dose, beetle species, seed type and the developmental stage targeted. Critical analysis exposes recurrent methodological weaknesses, including inconsistent reporting of stage-specific mortality and the frequent neglect of egg and pupal stages. The review concludes that durable management of Callosobruchus demands integrated, stage-aware strategies that combine non-chemical methods with the judicious use of safer compounds, and it identifies clear priorities for future research. |
