Genetic diversity in commercial cucumber genotypes was estimated based on 13 characters. Path analysis revealed that fruits/plant (0.701) and fruit weight (0.379) had maximum positive direct effect on yield. Seven cucumber genotypes were grouped into three different clusters. The highest inter-cluster distance (4.078) was observed between cluster I and II whereas lowest inter-cluster distance (1.011) was observed between the clusters I and III. Cluster II showed highest mean for length of main vine, nodes/plant, primary branches/plant, days to 1st male flowering, length of internodes/plant, fruits/plant and yield/plant whereas cluster III produced highest mean for leaf length, leaf breadth, fruit length, fruit diameter and fruit weight. Cluster II and III contributed 53.85 and 38.46%, respectively towards divergence.

A total of ten fungal species were isolated from the anthracnose symptoms of three varieties of Mangifera indica L. viz., Himsagar, Langra and Amrapali. The isolated fungi were Alternaria alternata (Fr.) Keissler, Aspergillus flavus Link, A. fumigatus Fresenius, A. niger van Tiegh., Colletotrichum gloeosporioides (Penz.) Sacc., Fusarium semitectum Berk. & Rav., Papulaspora sp. Preuss., Penicillium sp. Link., Pestalotiopsis guepinii (Desm.) Stey. and Rhizopus stolonifer (Ehrenb.) Vull. Colletotrichum gloeosporioides showed the highest per cent (26.82) frequency in Himsagar whereas R. stolonifer showed the lowest (2.22). Pestalotiopsis guepinii showed the highest per cent (46.83) frequency in Langra whereas R. stolonifer showed the lowest (1.17). Colletotrichum gloeosporioides showed the highest per cent (38.67) frequency in Amrapali whereas Papulaspora sp. showed the lowest (4.00). Among the isolated fungi C. gloeosporioides, F. semitectum and P. guepinii were found to be pathogenic to three mango varieties. Association of Fusarium semitectum, Papulaspora sp. and Pestalotiopsis guepinii with mango is new record in Bangladesh. Dhaka Univ. J. Biol. Sci. 27(1): 93-100, 2018 (January)

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Colonization experiment for the butterfly Pachliopta aristolochiae (Fabricius, 1775) (Lepidoptera: Papilionidae) was carried out in the Zoological Garden, Curzon Hall, University of Dhaka and Bhawal national park, Gazipur from 2010 to 2011, and butterfly host-plants and nectar-plants were identified for this purpose. The field observations and identification confirmed that the host plant species Aristolochia indica is a creeper plant. A. indica was cultivated for the butterfly oviposition behaviour and to continue developmental stages. The oviposition behaviour of gravid female, hatching, feeding and moulting behaviour of the four larval instars, and pupation behaviour of A. indica were recorded. Both laboratory and field observations revealed that while there was availability of food, 1st and 2nd instar larvae preferred tender leaves, whereas the 3rd and 4th instar larvae fed both on young and mature leaves. However, mature larvae were also observed to feed on the stems, flower and fruits of the host-plant in absence of suitable succulent leaves. The feeding time was recorded for each larval instars and it was relatively low for 1st and 2nd instar larvae, remarkably higher in 3rd instar larvae and highest in the case of ultimate and penultimate larval instars. The egg, larval and pupal mortalities were counted during the study period. Their survivability rate was 80% or more. This result was found to stand good for a successful colonization process of the butterfly P. aristolochiae.J. Biodivers. Conserv. Bioresour. Manag. 2017, 3(1): 45-54

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