Browsing by Author "Thomas Joseph"

Now showing 1 - 19 of 19
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    A bacterial blight disease of cardamom
    (2007-02-08) Mathew George; Thomas Joseph; Potty, V.P.; Jayasankar, N.P.
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    Bud rot disease of coconut—A reappraisal of associated factors
    (2007-02-08) Radha, K.; Thomas Joseph
    Bud rot disease of coconut caused by Phytophthora palmivora (Butl,) Butl. often tends to be fatal. None of the environmental factors associated with the disease was found to be solely responsible for its development. Manifestation of the disease requires a combination of favourable factors, of which high relative humidity and low temperature are the most important factors. Number of "favourable days" determined the incidence and severity of the disease, which in turn was dependent on the monsoon rains. Palms aged 3-20 years exposed to suitable microclimate were the most susceptible. The role of Phytophthora palmivora in the incidence of the disease, the nature of damage, and the possible implication of secondary invaders, such as bacteria in aggravating symptoms have been assessed. Production of oospores in infected tissues suggests the mode of survival of the pathogen in the cabbage of affected palms. Under favourable conditions an infection cycle could be completed in about a week by the pathogen.
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    Discourse on coconut root (wilt)
    (2007-02-08) Jayasankar, N.P.; Solomon, J.J.; Rawther, T.S.S.; Thomas Joseph; Muraleedharan, A.
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    Evaluating root degeneration in coconut in relation to root (wilt) disease
    (1982-08) Thomas Joseph; Jayasankar, N.P.
    Neither root degeneration nor root regeneration in healthy and root (wili)-affected coconut palms was statistically significant, Eight,. 11, and 6% of roots in West Coast Tall palms and 3, 3. and 4% of roots in locally grown Philippine palms were decayed in healthy trees, trees in the middle stage of the disease, and trees in the advanced stage of the disease, respectively. Observations confined to any sector of the root system were not representative of root characteristics
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    Evaluating root degeneration in coconut in relation to root (wilt) disease
    (2007-02) Thomas Joseph; Jayasankar, N.P.
    Neither root degeneration nor root regeneration in healthy and root (wili)-affected coconut palms was statistically significant, Eight,. 11, and 6% of roots in West Coast Tall palms and 3, 3. and 4% of roots in locally grown Philippine palms were decayed in healthy trees, trees in the middle stage of the disease, and trees in the advanced stage of the disease, respectively. Observations confined to any sector of the root system were not representative of root characteristics
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    Fungi associated with the coconut palm (Cocos nucifera L.)
    (2007-02) Thomas Joseph; Radha, K.
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    Impact of transfer of technology on small coconut holdings of Kerala
    (1993) Muliyar, M.K.; Thomas Joseph; Sukumaran, A.S.
    With a view to enhancing the socio-economic condition of the farm families in the villages of Kerala, two operational research projects on integrated land use and garden land management at Muttathody village in the northern zone and package of practices for the coconut root (wilt) affected disease area at Krishnapuram village in the southern zone of Kerala were started. Identified technologies were adopted and the developmental activities were extended to farmers in collaboration with different agencies. These activities included popularising agricultural and animal husbandry practices for different strata of farming community, integrated land use plan, timely supply of inputs, arranging agricultural credit, constructing community irrigation tanks and providing electrical energy to the village. The post-operational survey revealed that there was considerable increase in the nutrient consumption as well as yield of coconuts when compared to the pre-operational period. There was 49 per cent decline in the leaf rot disease. The yield of paddy has increased from 137 to 2.671 per ha between 1974 and 1983. The adoption of intercropping and mixed cropping in coconut and arecanut gardens also increased considerably. The improved goat breeds Sannen and Malabari introduced into the operational area enhanced the milk production by three times. The production rate of fresh-water fish in the Krishnapuram village increased from 0-244 kg/ha during 1976 to 395-700 kg/ha during 1982-83. The total area under irrigation increased by SO per cent. The number of pumpsets installed in the village increased from 93 to 388 during the project period. By arranging power supply to the Muttathody village 295 wells and 502 houses were electrified.
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    Mycological Investigations
    (2007-02) Lily, V.G.; Thomas Joseph
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    Role of Stephanitis typicus Distant in the spread of coconut root (wilt) pathogen
    (1972-05) Thomas Joseph; Shanta, P.; Lal, S.B.
    Banana lace-wing bug (Stephanitis typicus Distant) transmitted the pathogen associated with the root (wilt) disease of coconut. Preliminary studies on the vector-pathogen relationship, with cowpea (Vtgna sinensis (L.) Savi ex Hassk) as an indicator host, revealed that effective transmission was accomplished by groups of 10 bugs. They needed acquisition feeding- of 2 hr and transmission feeding of 16 hr. The infectiyity was lost after 24 hr. Affected palms in die age group of 25-35 years, which were in the middle stage of disease and had flaccidity alone as the symptom, were the most efficient sources of inoculum. At least 16 per cent of the field population of the bugs actively transmitted the disease.
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    A Screw Type Tree Injector
    (1984) Thomas Joseph; Rawther, T.S.S.
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    Studies on Bud Rot Disease of Coconut
    (1975) Radha, K.; Thomas Joseph
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    A Study On Root Decay In Relation To Coconut Root (Wilt) Disease
    (1981) Thomas Joseph; Jayasankar, N.P.
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    Symptoms
    (1981) Thomas Joseph; Jayasankar, N.P.
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    They Still Elude the Research Sleuths
    (1964-07) Thomas Joseph
    Cadang-Cadang, Lethal Yellowing and Root Wilt, dread diseases of the coconut palm that strike only to inflict lingering death have defied so far all efforts at finding their causes although research workers of many countries are hot on the trail of the killers.
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    They Still Elude The Research Sleuths
    (1964-07) Thomas Joseph
    Cadang-Cadang, Lethal Yellowing and Root Wilt, dread diseases of the coconut palm that strike only to inflict lingering death have defied so far all efforts at finding their causes although research workers of many countries are hot on the trail of the killers.
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    Transmission of root (wilt) disease of coconuts
    (2007) Shanta, P.; Thomas Joseph; Lal, S.B.
    Results of transmission trials conducted with coconut wilt 'virus' on seedlings of coconut grown in an insect proof screen house are reported. Primary symptoms of flaccidity. paling and slight stunting of younger leaves were observed on 5 of the 6 seedlings inoculated by rubbing, 2 1/2 to 3 1/2 years after inoculations were started. One of the 6 seedlings inoculated by means of infective S. typicus got diseased and showed paling and stunting of leaves. One of the 2 seedlings inoculated through soil also developed the disease. Soil at the base of some of the diseased seedlings became infective as evidenced by the cowpea test.