Browsing by Author "Lily, V.G."
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Item Association of fungi with coconuts producing rubbery copra in root (wilt) affected areas(2007-02-08) Lily, V.G.; Pillai, N.G.Item Changes in phenolic content of coconut leaf in relation to the development of leaf rot(2007-02-08) Lily, V.G.; Ramadasan, A.Item Etiology - Fungi(2007-02) Joseph, T.; Lily, V.G.Item Host-parasite relations of Bipolaris halodes (Drechs.) Shoemaker on the coconut palm(2007-02) Lily, V.G.The frequent association of leaf rot with the root (wilt) disease resulting in serious decline on the productivity of the coconut palms has been observed in the root (wilt) affected tracts of Kerala. The initial focus of infection is the tender most unopened leaf of the palm and the organism causing the disease has been identified as Bipolaris haldes (Drechs.) Shoemaker. Studies on the preference for tendermost leaves as sites of infection revealed that the thick ness of the epidermal layer of the leaf increased with age, the tendermost leaf having a mean thickness of 6.95 u as against 9.54 u in the matured leaf. The percentage of moisture content was maximum in the tendermost leaf (77.95) and it reduced to 61.33 in matured leaf. Results of tissue analyses indicated higher concentrations of total nitrogen, non-protein and protein nitrogen in the tendermost leaf (2.08 mg/g; 1.71 mg/g; 0.37 mg/g respectively on oven dried basis) and it came down to 1.05 mg/g; 0.87 mg/g and 0.18 mg/g respectively in fully matured leaf. A field experiment conducted to investigate whether proper nutrition ol coconut seedlings with N, P, K, Ca and Mg nutrients could provide any tolerance to infection by B. halodes revealed that although the leaf tissue took up infection, the severity of the same was only minimal in the seedlings receiving treatments of NPK with calcium and magnesium as compared to that in seedlings receiving other treatments. This result also indicates the importance of Ca and Mg nutrition of coconut palms in disease affected tracts.Item Host-parasite relations of Bipolaris halodes (Drechs.) Shoemaker on the coconut palm(1981-03) Lily, V.G.The frequent association of leaf rot with the root (wilt) disease resulting in serious decline on the productivity of the coconut palms has been observed in the root (wilt) affected tracts of Kerala. The initial focus of infection is the tender most unopened leaf of the palm and the organism causing the disease has been identified as Bipolaris haldes (Drechs.) Shoemaker. Studies on the preference for tendermost leaves as sites of infection revealed that the thick ness of the epidermal layer of the leaf increased with age, the tendermost leaf having a mean thickness of 6.95 u as against 9.54 u in the matured leaf. The percentage of moisture content was maximum in the tendermost leaf (77.95) and it reduced to 61.33 in matured leaf. Results of tissue analyses indicated higher concentrations of total nitrogen, non-protein and protein nitrogen in the tendermost leaf (2.08 mg/g; 1.71 mg/g; 0.37 mg/g respectively on oven dried basis) and it came down to 1.05 mg/g; 0.87 mg/g and 0.18 mg/g respectively in fully matured leaf. A field experiment conducted to investigate whether proper nutrition ol coconut seedlings with N, P, K, Ca and Mg nutrients could provide any tolerance to infection by B. halodes revealed that although the leaf tissue took up infection, the severity of the same was only minimal in the seedlings receiving treatments of NPK with calcium and magnesium as compared to that in seedlings receiving other treatments. This result also indicates the importance of Ca and Mg nutrition of coconut palms in disease affected tracts.Item Microbiology(2007-02) Jayasankar, N.P.; George, M.; Lily, V.G.; Thomas, G.V.Item Mycological Investigations(2007-02) Lily, V.G.; Thomas JosephItem Mycorrhizal Association in Plants(2007-02) Lily, V.G.Item Observations on the Inhibitory Activity of a Bacterium Activity of the Antifungal Substance Produced by the Bacterium Bacillus Subtilis(2007-02) Lily, V.G.; Radha, K.; Menon, K.P.V.Item Observations on the Inhibitory Activity of a Species of Bacterium on Some Fungi Parasitic on the Coconut Palm(2007-02) Lily, V.G.; Nair, U.K.; Pandali, K.M.; Menon, K.P.V.(i) An aerobic spore forming bacterial strain probably belonging to the Bacillus anthraeis group( possessing inhibitory action against fungi associated with the rodt and leaf disease of coconuts has been isolated and studied. (ii) The bacterium appears to be able to exert active lytic action on fungal mycelium and probably produces during its metabolic activities some potent fungicdal substance. (iii) Its presence in a mixed inoculum afforded protection to coconut leaf tissue from infection by the leaf rot organism, Helminthosporium halodes.Item Pathogenicity of Cylindrocarpon lucidum Booth on Coconut Palm(1981) Lily, V.G.Item Pathogenicity of Cylindrocarpon lucidum Booth on Coconut Palm(2007-02) Lily, V.G.Item Pectinolytic Properties of Certain Fungi Associated with Diseased Coconut Palms(2007-02) Lily, V.G.; Jayasankar, N.P.The fangi, Rhizoctonia solani, Bipolaris halodes, and Pestalotia palmarum, found constantly associated with diseased coconut palms, could grow in a medium containing pectin as the sole carbon source and also utilize the substrate. All the three organisms elaborated pectin methyl esterase, polygalacturonase and pectin Wans-eliminase in culture filtrates, but in variable quantities.Item Pectinolytic Properties of Certain Fungi Associated with Diseased Coconut Palms(1974) Lily, V.G.; Jayasankar, N.P.The fungi, Rhizoctonia solani, Bipolaris halodes, and Pestalotia palmarum, found constantly associated with diseased coconut palms, could grow in a medium containing pectin as the sole carbon source and also utilize the substrate. All the three organisms elaborated pectin methyl esterase, polygalacturonase and pectin trans-eliminase in culture filtrates, but in variable quantities.Item Preliminary Studies on the Association of Fusarium Equiseti (Corda) Sacc and Cylindrocarpon Effusum Bugn with Coconut Root (Wilt) Disease(2007-02) Lily, V.G.Root decay is often found to be associated with Coconut root (wilt) disease. Evidences suggest the association of some fungi in causing root damage. Recently Fusarium equiseti and Cylindrocarpon effusum were isolated from apparently healthy roots of root (wilt) affected and also apparently healthy palms of diseased tract. Pathogenicity trials indicated the ability of these fungi to cause internal damage prior to the development of external symptoms in roots as evidenced by the derangements observed at the stelar region. As the infection progressed, acute symptoms were noticed, exhibiting black necrotic patches on the mature roots and also rotting of the root tip. The number of rotted roots increased as the period of incubation prolonged resulting in a deteriorated root system as occurring in root (wilt) affected palms.