Fungal Diseases of Groundnut in Brahmaputra Alluvial Soil of Bangladesh

抄録

Three varieties of groundnut (Dhaka-l, DG-2, ACC-12) were studied to observe the seed bone diseases and the extent of disease development in the field at two depths of plantation. There were significant differences among the varieties in case of germination and pre-emergent death in the laboratory. Highest pre-emergent death was found in Dhake-1, followed by DG-2 and ACC-12. Pre-sowing test in the laboratory revealed association of 8 fungal species with the seeds. Seeds of three varieties planted in the field showed that the two depths of plantation (4.0cm and 6.5cm) showed significant difference in case of pre-emergent mortality. The depth of plantation also showed significant differences on percentage of germination and post-emergent death for all the varieties. Varital differences had marked influences in disease development in all stages of groundnut seedling. Periodic uprooting of seedlings showed considerably higher percentage of disease symptoms in 6.5cm depth than that of 4.0cm depth. ‘The highest root rot was occurred in DG-2 followed by ACC-12 and Dhaka-1. Interactions between depth of sowing and variety were observed for germination, pre-emergent death, post emergent death and total disease development of groundnut and was found significant at 1% level.