Browsing by Author "Rawther, T.S.S."

Now showing 1 - 20 of 25
  • Thumbnail Image
    Item
    Control of Arecanut Spindle Bug Carvalhoia arecae M. and C. using Granular Insecticides in the Field
    (2007-02-08) Sathiamma, B.; Abdulla Koya, K.M.; Rawther, T.S.S.; Chandy Kurian
    Granular formulations of phorate, lindane and quinalphos were tested under field conditions in demonstration cum trial plots at CPCRI, Research Centre, Palode during 1977-1980. Trials proved that granular formulations of lindane and phorate, applied to the innermost two or three leaf axils @ 10 g per palm at quarterly intervals, in March, June, September and December effected significant control of the spindle bug population in the field. The cost of the insecticide granule+labour for treatment of 100 palms worked out to Rs. 301- for lindane and Rs. 381- for phorate.
  • Thumbnail Image
    Item
    Discourse on coconut root (wilt)
    (2007-02-08) Jayasankar, N.P.; Solomon, J.J.; Rawther, T.S.S.; Thomas Joseph; Muraleedharan, A.
  • Thumbnail Image
    Item
    Diseases
    (1982-12) Rawther, T.S.S.; Radhakrishnan Nair, R.; Saraswathy, N.
  • Thumbnail Image
    Item
    Early diagnostic techniques on the root (wilt) disease of coconut in India
    (2007-02-08) Rajagopal, V.; Sasikala, M.; Sumathy Kutty Amma, B.; Chempakam, B.; Rawther, T.S.S.
  • Thumbnail Image
    Item
    Effect of application of macro and micro nutrients and irrigation on the incidence of yellow leaf disease of arecanut
    (2007-02-08) Rawther, T.S.S.; Abraham, K.J.
    A field trial was conducted to study the effect of the application of macro and micronutrients and irrigation on tht incidence of yellow leaf disease of arecanut. NPK and micronutrients were applied in combination. Neither NPK nor micronutrients had any ameliorative effect on the disease while irrigation coupled with manuring maintained the yield at economic level.
  • Thumbnail Image
    Item
    Effect of application of macro and micronutrients and irrigation on the incidence of yellow leaf disease of arecanut
    (2007) Rawther, T.S.S.; Abraham, K.J.
    A field trial was conducted to study the effect of the application of macro and microautrients and irrigation on the incidence of yellow leaf disease of arecanut. NPK and micronutrients were applied in combination. Neither NPK nor micronutrients had any ameliorative effect on the disease while irrigation coupled with manuring maintained the yield at economic level.
  • Thumbnail Image
    Item
    Evaluation of six granular insecticides for the control of arecanut spindIe bug, Carvalhoia arecae Miller and China in the field
    (1979-08) Abdulla Koya, K.M.; Rawther, T.S.S.; Sathiamma, B.; Chandy Kurian
    SIX granular insecticides VIZ. lindane 60, carbaryl+ lindane 4 : 40, carbaryl 40, mephosfolan 50, thiodemeton 50 and quinalphos 50 were tested in the field against the spindle bug, Canalhoia arecae Miiler and China on arecanut palm. All the insecticides effected control of the pest. However, quinalphos was superior to mephosfolan and thiodemeton.
  • Thumbnail Image
    Item
    Fungal diseases of coconut in the world
    (2007-02) Nambiar, K.K.N.; Rawther, T.S.S.
    A wide array of fungi attack coconut palm causing different degrees of tosses. Among these, a few fungi are causative agents of important diseases inflicting either death of the palm or gradual decline in vigour and/or yield. The diseases are described under: (1) major diseases, (2) diseases which are likely to become major in future, and (3) minor diseases. The important diseases described are bud rot, basal stem rot, stem bleeding, lethal bole rot, leaf rot etc. The paper also gives an account of the world distribution of important fungal diseases and losses caused by them. The symptomatology, etiology, epidemiology and disease management of major diseases are described in brief. The future lines of work are also outlined at the end. A coordinated approach in research on coconut diseases on a regional basis should receive attention so that there is free exchange of information and expertise between these countries. Investigations on disease management including reaction of varieties to important diseases of coconut should be a priority in the research programmes of different coconut research institutes.
  • Thumbnail Image
    Item
    Leaf Rot Disease
    (2007-02) Srinivasan, N.; Gunasekaran, M.; Joseph, T.; Rawther, T.S.S.
  • Thumbnail Image
    Item
    Leaf Rot Disease
    (2007-02) Joseph, T.; Rawther, T.S.S.
  • Thumbnail Image
    Item
    Microbial Profiles of Arecanut Soils Under Mixed Cropping with Special Reference to Arecanut Yellow Leaf
    (2007-02) Rawther, T.S.S.; Abraham, K.J.; Achuthan Nair, M.; Jayasankar, N.P.
    A mixed cropping experiment was started in 1975 in the yellow leaf diseased region of Palode with cow pea, NB 21 and guinea grass crop mixed with arecanut palms. The nitrogen fixing Azotobacter and Beijerinckia and phosphate solubilising microflora were enumerated in the arecanut soils during the years 1976, 1977 and 1978. The yield and disease status of the arecanut palms under mixed cropping were also recorded for the three years starting from 1976-78. The influenc of crop mixing in comparison with the control arecanut palms (palms without any crop mixing) has been discussed with emphasis on yellow leaf disease
  • Thumbnail Image
    Item
  • Thumbnail Image
    Item
    Observations on the seasonal variations in the rhizosphere microflora of coconut with special reference to fungi
    (2007-02) Radha, K.; Rawther, T.S.S.
    (1) The influence of environmental conditions on the rhizosphere microflora with reference to the Root (Wilt) disease of coconut has been indicated. (2) The importance of rainfall and consequently soil moisture in determining the nature (quantitative) of the rhizosphere fungal flora was shown by the data collected from Kayangulam and Pandalam. (3) The increased susceptibility of the diseased palms to environmental factors and its indirect effect on the rhizosphere fungal population has been presented.
  • Thumbnail Image
    Item
    Origin, Distribution and Production Loss
    (2007-02) Jacob Mathew; Rawther, T.S.S.; Pillai, N.G.
  • Thumbnail Image
    Item
    Pests and Diseases of Garden Land Crops
    (2007-02) Radha, K.; Rawther, T.S.S.
  • Thumbnail Image
    Item
    Pests and Diseases of Garden Land Crops
    (1976-02) Radha, K.; Rawther, T.S.S.
  • Thumbnail Image
    Item
    A Screw Type Tree Injector
    (1984) Thomas Joseph; Rawther, T.S.S.
  • Thumbnail Image
    Item
    Seasonal Fluctuations in Population of the Spindle Bug Carvalhoia arecae M. and C.(Heteroptera : Miridae)
    (1985) Sathiamma, B.; Abdulla Koya, K.M.; Abraham, V.A.; Rawther, T.S.S.; Chandy Kurian
    The spindle bug Carvalhoia arecae is one of the major pests of arecanut palm. The bugs suck sap from the tender tissues of the spindle leaf and cause necrotic lesions. Seasonal fluctuation in population of the spindle bug studied at three locations revealed that the pest occurred throughout the year. The peak period of the pest abundance was found to vary at different centres. The peak period of occurrence was in January and November at Krishnapuram, in July at Palode and in February at Sullia. High pest population was noted at Krishnapuram and Palode whereas it was quite low at Sullia. Among the weather factors, positive correlation was observed with rainfall and pest population.
  • Thumbnail Image
    Item
    Soil Conditions and Disease Incidence in Coconut
    (1963-04) Rawther, T.S.S.
  • Thumbnail Image
    Item
    Studies on the microflora of coconut soils - Observations on the microbiological activity of coconut soils with reference to the root (wilt) disease.
    (1963) Rawther, T.S.S.; Radha, K.
    1. Observations on the microbiological activity of the soil collected from the base of healthy and diseased coconut palms were recorded, the criteria being the amount of Co2 evolved from a known quantity of soil per unit time and number of bacterial counts yielded by unit weight of soil. 2. The data collected from 54 soil samples indicate considerable variation between the healthy and the diseased. The healthy samples consistantly recorded higher microbiological activity and bacterial number than the diseased. 3. Indication of the influence of environmental conditions like rainfall and soil fertility on microbial activity are also forthcoming.