Browsing by Author "Menon, K.P.V."
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Item Aetiology of the wilt (root) disease :Investigations on its virological nature(2007-02-08) Shanta, P.; Menon, K.P.V.; Patchu Pillai, K.Item Aetiology of the Wilt (Root) disease:Investigations on its virological nature(2007) Shanta, P.; Menon, K.P.V.; Patchu Pillai, K.Item Cadang-Cadang & root (wilt) diseases(1957-08) Menon, K.P.V.Item Cadang-Cadang & root (wilt) diseases(2007-02-08) Menon, K.P.V.Item Chemical studies on the leaf and root (wilt) diseases of coconuts in Travancore-Cochin : VII. Cadmium content of coconut soils and coconut leaves(2007-02-08) Varghese, E.J.; Sankaranarayanan, M.P.; Menon, K.P.V.Item Chemical studies on the leaf and root (wilt) diseases of coconuts in Travancore-Cochin II. Nutrient content of leaves of healthy and diseased trees(2007-02-08) Verghese, E.J.; Sankaranarayanan, M.P.; Menon, K.P.V.Item THE COCONUT PALM - A MONOGRAPH(1958) Menon, K.P.V.; Pandalai, K.M.Item Discussion and preliminary reports cowpea (Vigna sinensis Endl.), an indicator plant for the coconut wilt virus(2007-02-08) Shanta, P.; Menon, K.P.V.Item Diseases-of undetermined causes, with special reference to the root(wilt) disease of south India(2007-02-08) Menon, K.P.V.Item The Genius Rhizoctonia in Relation to Soil Moisture(1957) Radha, K.; Menon, K.P.V.Item The Genus Rhizoctonia in Relation to Soil Moisture - Studies on Rhizoctonia solani and Rhizoctonia bataticola(1957) Menon, K.P.V.; Radha, K.The saprophytic activity of R. solani and R. bataticola, the organisms associated with the Coconut Root (wilt) disease was investigated in relation to soil moisture. Both the organisms made nur mycelial spread in natural soil. In autoclaved soil the test fungi grew well under a wide range, of soil moisture. Evaluation of the soil microflora and the microbiologica activity in the soil under different moisture conditions revealed that the activity of the test fungi is correlated with the microbial status of the soil which is directly influenced by the moisture content of the soil.Item Investigations on Diseases of the Coconut Palm in Travancore - Cochin State -Studies on Soil Conditions in Relation to Disease Incidence(2007-02) Sankarasubramony, H.; Menon, K.P.V.; Pandalai, K.M.1. The coconut palm appears to thrive fairly well in all the three main soil types found in the Tra-vancore-Cochin State. 2. Disease appears in trees growing in all these soil types and the disease symptoms are uniformly thesame irrespective of the locality and nature of the soil type. 3. Compared to healthy areas the results of analysis of soil samples from diseased areas show a highly depleted condition in the major plant food factors particularly in the content of available potash. 4. The soils from diseased areas have a very low clay content and consequently a very low water holding capacity. 5. The base exchange properties of the soils from diseased areas, the composition of the clay fraction etc. reveal that the soils are of a very poor type from point of view of fertility. 6. Various factors which appear to be individually or collectively responsible for the disease incidence are discussed and future lines of work briefly indicated. 7. Additional evidence has been presented with regard to the importance of soil conditions in relation to disease incidence.Item The Manganese Content of Soil and Plant Tissue in Relation to the Root and Leaf Diseases of the Coconut Palm(1951) Sankarasubramony, H.; Pandalai, K.M.; Menon, K.P.V.Item The Manganese Content of Soil and Plant Tissue in Relation to the Root and Leaf Diseases of the Coconut Palm(2007-02) Sankarasubramony, H.; Menon, K.P.V.; Pandalai, K.M.Data is given on the manganese contents of tissues collected from healthy and diseased coconut trees and of soils of the respective areas. The manganese contents vary between very wide ranges,from traces up to 435 p.p.m. in soils and from traces to 176.5 p.p.m. in tissue samples. These make it difficult to diagnose the disease as involving a manganese factor and there appears to be no correlation between disease incidence and manganese status of the soils and tissues of the ,coconut palm. Work to elucidate the problem further is in progress in these laboratories.Item A note on the Strontium content of coconut leaves and soils in relation to Leaf and Root (wilt) diseases of coconuts in Travancore & Cochin(2007-02) Verghese, E.J.; Menon, K.P.V.; Shankaranarayanan, M.P.Representative samples of coconut leaves and soils were analysed spectrographically for strontium. Strontium was found in these samples only in traces. The relation of strontium to the Leaf and Root (wilt) diseases of coconut trees in Travancore and Cochin is discussed.Item A note on the yield of coconut in relation to rainfall and leaf rot and root (wilt) diseases(1962) Radha, K.; Sahasranaman, K.N.; Menon, K.P.V.Item Observations on Root Decay in Coconuts, its Cause and its Relation to the Foliar Symptoms of Disease in the Disease Belt of Travancore-Cochin(1955) Nagaraj, A.N.; Menon, K.P.V.The common foliar symptoms of disease met with in the disease belt of Travancore-Cochin have been classified into four categories, viz., wilt, tapering stem, yellowing of outer leaves accompanied by nut-fall and general chlorosis. The symptoms in each category are described. A comparative study of the root systems of healthy trees and those exhibiting different types of foliar symptoms, showed that only tapering stem symptoms were consistently associated with a high percentage of root decay. Some of the healthy trees had a high percentage of decayed roots, while a few palms in early stages of wilt (root) disease were free from root decay. There was no significant difference in the extent and frequency of root decay, between healthy trees and those in early stages of wilt (root) disease; it is therefore suggested that the name wilt is more appropriate for this disease (category 'A'). Root rotting observed in the middle and advanced stages of wilt disease, and in the other two categoric (yellowing of outer leaves, and general chlorosis) might be a secondary effect of disease. In the infection experiments with isolates of three fungi, R. solani, R. bataticola and B. theobromae, only one isolate of R. solani parasitised coconut roots causing a brown rot of tissues. There was a difference in pathogenicity between isolates of R. solani. The isolates of the other two fungi that were tried, were not pathogenic. Nematodes associated with a soft rot of roots could not infect living coconut roots and are probably saprophytic. Observations have indicated that biting insects might also contribute towards death of coconut roots and that a persistent high water table or a hard soil pan might pave the way for root decay.Item Observations on Root Decay in Coconuts, Its cause and its relation to the Foliar Symptoms of Disease in the Disease Belt of Travancore-Cochin(1955) Nagaraj, A.N.; Menon, K.P.V.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.
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