RESISTANCE SOURCE(S) AMONG DIFFERENT MUNGBEAN VARIETIES AGAINST PULSE BEETLES AND THEIR ALTERNATIVE MANAGEMENT

Abstract

The experiments were conducted in the laboratory under the Department of Entomology, Sher-e-Bangla Agricultural I iniversity, Dhaka. Bangladesh during the period from March. 2007 to October. 2007 to screen some mungbean varieties br resistance to pulse beetles and to find the most effective component(s) among some selected hotanicals applied against pulse beetles. Considering the laboratory screening of nine mungbean varieties for resistance against Calloscjbruci,z,s clzineizsjs Linn. and C. incwulatus Fab., in both free choice and no choice tests more or less similar trends of results were found for both the species. In case of C.'allosobruc/nts chinensLc Linu., the variety BARI Mug-6 was highly susceptible; BARI Mug-4, BARI Mug-3 and BARI Mug-5 were susceptible: BARd Mug-2 and I3INA Mug-I were moderately resistant, while BU Mug-2, I3arisal local and 131i Mug-I were Ibund to he highly resistant host for C'. chinensix in respect of egg deposition, growth and development, adult emergence and grain content loss. But there was no varietal preference on egg hatching. In terms of infestation by C. niacu/atus Fah., the varieties I3arisal local. BARI Mug-3, I3ARI Mug-4, BARI Mug-S and BINA Mug-i were highly susceptible; BARI Mug-6 was moderately susceptible. BU Mug-I was susceptible, while BARI Mug-2 and l3IJ Mug-2 were found to be moderately resistant to C'aI/osobruchus inaculdilus in respect of growth and development, adult emergence and grain content loss except egg deposition, but there was no varietal influence on egg hatching. For both free choice and no choice tests, the adult emergence started at 18 and 20 days aller release (DAR) of adults of C. clsinensis and (7. Inacu/atus respectively, then the larvae and pupae developed internally, damaged seed and grain content loss over control for both the species, while partial reduction occurred by Neem o number of adult emergence increased gradually and maximum adults were emerged at 20-2 1 DAR and 22 DAR respectively and then decreased gradually. Considering the ctièctivencss of different botanicals during the management of C. cliinenstc and C. macu/a/us, inlesting BAR!Mug-6 and Barisal local respectively, the treatment T3 comprising Camphor @ 2 gm/kg seeds. T1 comprising Neem oil @ 8 mI/kg seeds and 12 comprising Castor oil @ 8 nil/kg seeds performed the best results in respect of percent reduction (100%) of larvae and pupae developed internally, damaged seed and grain content loss over control for both the species, while partial reduction occurred by Neem oil and Castor oil in terms of egg deposition, egg hatching. Considering the effectiveness of different botanicals on viability of seeds during (lie management of pulse beetle, there was no significant et'kct of Camphor, Neem oil and Castor oil in reducing the viability of seeds, while other treatments (comprising Neem leaf powder 5% w/w, Castor leaf powder 5% w/w and Bankolmi leaf powder 5% '/w) reduced the viability of seeds.