AJAR (2016), Vol. 1, Issue 04

  • Vulnerability of the fishery-based households to the impact of climate change

    This study examines the vulnerability of fishery-based households in Ethiopian rift valley lakes Chamo and Hawassa. The vulnerability assessment approach used vulnerability indicator method which is composed of both biophysical and socioeconomic indicators of fishery-based households. The indicators selected were classified into exposure, sensitivity and adaptive capacity. Principal component analysis (PCA) was used to give weight to the vulnerability indicators. The result shows that the fishery-based households around Lake Chamo are more vulnerable to climate change than in Lake Hawassa. The result of this study stresses the immediate need for appropriate adaptation and/or mitigation measures to help the livelihood of the fishermen in the study areas. The results of this study should be considered for future decision making when mitigation and adaptation mechanisms are selected.

  • Plant parasitic nematode associated with sweet potato in Nigeria

    Survey of plant parasitic nematodes were carried out in some sweet potato growing areas of Nigeria. The research was design to assess the plant parasitic nematode pests of sweet potato in sweet potato growing areas in Nigeria. Soil samples and sweet potato tubers were randomly sampled from selected farm sites in Oyo, Osun, Kaduna, Kwara, Kogi, Abia, Cross Rivers, Benue, Taraba and Plateau States of Nigeria. Plant parasitic nematodes were extracted from soil and sweet potato tubers following standard methods and identification key for agriculturally important plant-parasitic nematodes was used for the nematode identification. Nematodes were extracted and identified in the laboratory. The plant parasitic nematodes identified in the soil samples and sweet potato tuber were root knot nematode Meloidogyne incognita, reniform nematode Rotylenchulus reniformis, lesion nematode Pratylenchus species, brown ring nematode Ditylenchus destructor and D. dipsaci, stubby root nematode Paratrichodorus spp. and dry rot nematode Scutellonema bradys. Plant parasitic nematodes infected sweet potato tubers have unappealing appearances, cracks, internal lesions and dry rot.

  • Effect of storage condition on seed quality and health in jute O-9897

    The experiments were conducted in the laboratory of Plant Pathology Department, Bangladesh Jute Research Institute. The experiments were conducted during the period 15 January 2010 to 5 March 2012. Nine different types of containers viz. tin pot, plastic pot, poly bag, gunny bag, gunny bag lined with polythene, earthen pot, cloth bag, brown paper and IRRI poly bag, two level of moisture contents viz. farmers’ condition (13%) and recommended moisture condition (9.5%) by Bangladesh Gazette (2010) and seed treatment with Provax-200 and control (untreated) were used for the present study. Seeds were stored for 12 months and examined after 4. 8 and 12 months of storage. Among the nine containers, tin pot was found better in respect of moisture content, germination, mean germination time, vigour index and 1000- seed weight. Health condition of seeds was also superior compared to other containers. The poorest performance was observed in earthen pot regarding moisture content, germination, mean germination time, vigour index, 1000- seed weight and seed borne infection. The findings of the present study also reveal that recommended moisture content was better than farmers’ condition. Provax-200 treated seed also resulted better performance than non treated seed. So, Quality of jute seeds can be maintained by storage in tin pot with provax-200 treated and recommendation moisture content (9.5%).