Seeds of three aromatic rice (Oryza sativa L.) var. Kalijira, Kataribhog and BR 34 Jira dhan were tested by Blotter method for identifying their seed borne fungi. Fungi associated with seeds were Aspergillus niger, Apergillus sp., Carvularia sp., Cladosporium sp., Colletotrichum sp., Fusarium sp., Pyrenochaeta oryzae and Sarocladium oryzae. Infected samples were collected from the field starting from maximum tillering stage to grain filling stage of plant growth. After maximum tillering stage three fungal diseases were recorded on the stems and sheaths. Sheath rot was recorded on all the three rice varieties, stem rot was recorded on Kalijira and sheath blotch was recorded on Kataribhog. The pathogens of sheath rot, Sarocladium oryzae, sheath blotch, Pyrenochaeta oryzae and stem rot, Sclerotium oryzae were frequently associated with the respective samples. This is the first report of disease on aromatic rice plant for Bangladesh.
A study on response of 29 barley genotypes resistant to Bipolaris leaf blight (Bipolaris sorokiniana) was conducted to investigate the relationship of the components of resistance of 29 barley genotypes. Data on five components of resistance viz., infection frequency (number of lesions per plant), lesion size (mm 2 ), percent leaf area affected by lesion, percent necrotic area on leaf, and disease severity were recorded as components of resistance. The genotypes fall into four clusters. Cluster I was to be the largest having 11 genotypes which was followed by cluster III, IV, and II. Considering the overall mean performances of different clusters, genotypes of cluster II showed better performance against resistance. From the cannonical variate analysis, it was found that three components like lesion size, necrosis, and 100-seed weight were found positive for the both vector, and these characters contributed maximum towards the divergence for disease development of the barley accessions.
Leaf surface is an intensely competitive environment for fungi. Recently, three species of fungi were noticed on phyllaplane of Datura metel L. The fungi were Colletotrichum sp., Pseudocercospora sp .and Trichoderma viride Pers. All the three fungi along with Trichothecium roseum Link were found on Vigna catjang L. Interaction among these fungi on phylloplane of their respective plants are presented in this paper.Psuedocercospora sp., Colletotrichum sp, Trichoderma viride, and Trichothecium roseum belong to the class Deuteromycetes. Pseudocercospora sp. causes indistinct leaf spots with greenish black superficial mycelial growth mostly on ventral surface of leaves. Colletotrichum sp. is a facultative parasite, responsible for anthracnose of various economically important plants. Trichoderma viride is a well known biocontrol agent throughout the world. T. roseum is a saprophytic fungus, sometimes found as laboratory contaminants. It is also an established biocontrol agent. Phylloplane mycoflora on Vigna sinensis L, and their interaction was described by Shamsi and Naher (2010).The biological control of plant disease has recently gaining appreciable importance to Plant Pathologists. Intensive research has been done in this field to avoid the hazardous impact of pesticides and agro-chemicals on ecosystem. The biological agents, the mycoparasites have also attained a significant position. It has been suggested that efforts should be made to investigate the biological control of plant disease through parasitism and predation.Present study was made to evaluate the antagonistic activities of T. viride and T. roseum against Pseudocercospora sp. and Colletotrichum sp. on leaves of D. metel and V. catjang.Samples of D. metel were collected from Botanic Garden Curzon Hall Campus, Dhaka University, Dhaka. Infected leaf lets of V. catjang were collected from New D.O.H.S Mohakhali and Sobhanbag, Dhaka. In total twelve samples were examined for each plant. Freshly collected samples were used for microscopic observation of fungal structures. The fungi associated with D. metel and V. catjang were isolated following "Tissue Planting" and "Blotter"
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.