Browsing by Subject "Pathogen"

Now showing 1 - 3 of 3

Open Access
Integrated management of seedling blight disease of tea caused by Sclerotium rolfsi
(University of North Bengal, 2015-03) Bhagat, Indramani; Chakraborty, Bishwanath
Tea is one of the important plantation crops in Nepal. One of the important fungal pathogens Sclerotium rolfsii, causing seedling blight disease in tea was found to be predominant in the nursery grown plants. The art and science of plant disease control has moved in the direction of biological control of plant pathogen is a distinct possibility for the future and can be successfully exploited in modern agriculture, especially within the framework of integrated disease management systems. Effective integrated management practices against S. rolfsii were developed using neem cake, oil cake, aqueous leaf extract of Azadirachta indica, bio-control agent like Trichoderma harzianum and calixin (0.1 vi%) in vivo. Combination with cow dung, neem cake, oil cake, chicken manure and rabbit manure, disease reduction were insignificant. However, combination with neem cake and oil cake showed 66.4% disease incidence, whereas in oil cake, neem cake and Azadirachta indica in combination disease incidence were recorded 11.1%. Under pot culture conditions T. harzianum alone and in combination with neem cake, oil cake and Azadirachta indica provided best effective management practices of seedling blight in all the three modes of application viz., simultaneous, repeated and post infection.
Open Access
Management of Fusarium wilt of tomato caused by Fusarium oxysporum f sp. lycopersici
(University of North Bengal, 2019-03) Bhagat, Indramani
Fusarium wilt of tomato (Lycopersicum esculentum Miller) caused by Fusarium oxysporum f sp. lycopersici is one of the most destructive diseases in tomato throughout the world. Effective and efficient management of the crop disease is generally achieved by the use of synthetic pesticides. These pesticides cause deleterious effects on human health and biosphere. Amendments (Neem cake, oil cake, cow dung, rabbit manure and chicken manure) were used in tomato seedlings to observe growth promotion increase in healthy and treated tomato seedlings of two varieties, Shrijana and Patam. Results revealed that growth of the tomato seedlings was significantly increased following amendment with neem cake and oil cake in the treated Fusarium oxysporum f sp. lycopersici inoculated plants than in untreated uninoculated plants as recorded. Oil cake had better effect than neem cake manure. It has been observed that the growth of tomato seedlings increased in untreated inoculated than treated inoculated tomato seedlings. Among cow dung, rabbit manure and chicken manure, chicken manure gave better growth of tomato seedlings than that of rabbit manure and cow dung. Similarly effective integrated management practices against Fusarium oxysporum f sp. lycopersici were also developed using neem cake, oil cake, aqueous bulb extract of Allium sativum, bio-control agent like Trichoderma harzianum and calixin (0.0125%) in vivo. Combination with cow dung, neem cake, oil cake, chicken manure and rabbit manure, disease reduction were insignificant. However, combination with neem cake and oil cake showed 64.4% disease incidence, whereas in oil cake, neem cake and Allium sativum in combination disease incidence were recorded 10.1%. Under pot culture conditions T. harzianum alone and in combination with neem cake, oil cake and Allium sativum provided best effective management practices of Fusarium wilt in all the three modes of application viz., simultaneous, repeated and post infection.
Open Access
Plant Defense Proteins
(University of North Bengal, 2008-03) Chakraborty, B.N.
Plants are compelled to withstand stresses of all kinds, be it biotic, abiotic or anthropogenic as a consequence of their immobility. The initial infection process involving adhesion/recognition events between plants and fungal pathogens is essential for the establishment of pathogenesis. The extracellular matrix (ECM) is a biologically active part of the cell surface composed of a complex mixture of macromolecules that, in addition to serving a structural function, profoundly affect the cellular physiology of the organism. During the past two decades it has become evident that the cell wall is a dynamic organization that is essential for cell division, enlargement and differentiation as well as responding to biotic and abiotic stress. ECM is also the source of signals for cell recognition within the same or between different organisms. Cell walls are natural composite structures, mostly made up of high molecular weight polysaccharides, proteins and lignins. Lignins are only found in specific cell types. Arabidopsis thaliana cell wall proteins (CWP) that can be involved in modifications of cell wall components, wall structure and signaling as well as interactions with plasma membrane proteins at the cell surface has been reviewed.