Browsing by Author "Rao, D.V.R."

Now showing 1 - 8 of 8
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    Evaluation of Certain Coconut Crosses for Heterosis
    (2002) Rao, D.V.R.; Hameed Khan, H.; Srinivasulu, B.; Rao, N.B.V.C.; Kalpana, M.
    The extent of heterotic effects in coconut crosses involving different parent combinations of 16 crossess and 7 characters was studied. The studies revealed the prevalence of wide range of variability and heterosis in the coconut crosses. The level of heterosis with respect to different characters in the crosses studied and its. significance in the coconut breeding programme are discussed in this paper.
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    Field Studies on Rhinolure Trap in the Control of Rhinoceros Beetle (Oryces Rhinoceros) in Coconut
    (2002) Sujatha, A.; Nair, C.P.R.K.; Rao, D.V.R.
    The adult rhinoceros beetle damages the coconut palm by boring into tender and soft tissue of bud region i.e., unopened leaves and spathes resulting in the reduction of yield up to 10 per cent. Sometimes, it acts as a carrier for bud rot disease and also pre disposes the palm to the attack of red palm weevil. Although chemical control remains the most effective control measure to date, current emphasis is mainly on the use of eco friendly measures like bio control agents, plant origin pesticides, pheromones etc., with an aim of reducing the use of chemicals for control. The major effect of Integrated Pest Management has been to reduce pesticide use to very low level. Studies with 0. rhinoceros have helped to identify an active compound i.e., aggregation male pheromone (ethyl 4 - methyl1 - octanoate) and opens up new prospects for controlling the pest effectively. Hence, present studies were carried out to test the efficacy of the pheromone in reducing the beetle damage, as this has direct impact on the pest build up in the field.
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    Integrated disease management of basal stem rot in coconut
    (2007-06) Srinivasulu, B.; Vijaya Krishna Kumar, K.; Aruna, K.; Rao, D.V.R.
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    Performance of coconut based cropping systems for sustainable productivity under Coastal Ecosystem of Andhra Pradesh
    (2004-12) Rao, D.V.R.; Kalpana, M.; Srinivasulu, B.; Khan, H.H.
    Two coconut based multispecies cropping systems consisting of Model-I (Coconut + Cinnamon + Pepper + Cocoa + Banana + Pineapple + E.F.Yam + Colocasia + Turmeric) and Model-II (Coconut + Pepper + Banana + Pineapple + E.F.Yam + colocasia + Turmeric) were evaluated comparing with coconut monocropping system (Model-III) for coconut yield, nut quality and sustained productivity and economic viability for four consecutive years (1999-2003) at ARS, Ambajipeta. Data on mean nut yield/palm/year revealed that the highest yields were registered by the palms of Model-I (102.7 nut/palm/ year) followed by Model-II (96.47 nut/palm/year) compared to only 7 1.14 nut/palm/year in Model-III (monocropping) accounting for an yield increase of 35.60 to 44.36 per cent. Data on annual nut yield exhibited a gradual increase year after year from 1999- 2000 up to 2002-03 indicating the sustainability of the cropping system. The nut yield increased, by 27.04 per cent in Model-I and 18.47 per cent in Model-II compared to only 3.63 per cent in Model-III prior to the experimental values. The economic analysis and employment generation studies revealed that the maximum returns and maximum number of mandays/ha/year were obtained from Model-I (Rs.47,589 and 680 mandays) followed by Model-II (Rs. 39,496 and 569 mandays) with Model-III putting up the lowest returns and mandays (Rs. 9,477 and 166 mandays). Considering the monetary returns and sustainability of the coconut yields, cropping system Model-I followed by Model-II were found suitable and these models may be recommended to the coastal ecosystem of AP.
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    Prevalence of Basal Stem Rot Disease of Coconut in Coastal Agro-Ecosystem of Andhra Pradesh
    (2002-11) Srinivasulu, B.; Aruna, K.; Krishna Prasadji; Rajamannar, M.; Sabitha Doraisamy; Rao, D.V.R.; Khan, H.H.
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    Transmission electron microscopy confirms pytoplasmal etiology of Tatipaka disease of coconut
    (2006) Srinivasulu, B.; Nagamalleswari Devi, Y.; Vijay Krishna Kumar, K.; Aruna, K.; Krishna Prasadji, J.; Rao, D.V.R.
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    Trichoderma Hamatum - A Potential Biocontrol Agent For Basal Stem Rot (Ganoderma Wilt) Disease Of Coconut
    (2002) Srinivasulu, B.; Aruna, K.; Lakshmi, K.M.; Sabitha Doraisamy; Rao, D.V.R.; Hameed Khan, H.
    Basal stem rot (Ganodenna wilt) disease caused by Ganoderma spp is one of the major constraints in coconut cultivation, especially in light soils of Andhra Pradesh. Native bio control agents, Trichodenna spp were isolated and were identified as T.viride, T.harzianum and T.hamabim. The compatibility of commonly used agrochemicals with native bioagents and test pathogen was determined. Talc formulations for the three spp of Tnchoderma were developed. Neem cake, wheat grains and farmyard manure were found to be superior over other substrates for mass multiplication as indicated by maximum growth and sporulation of these bio agents. ZnSO, (296) was found inhibitory to Ganoderma spp but not to T.viride, T.hamatum and T.harzianum (1% ZnSO,). Field studies indicate that the talc formulations (50 glpalm) of T.hamatrrm alone and in combination with 5 kg neem cake potentially arrested the spread of the disease (0 to 3%) followed by T.harzianum and T.viride when fortified in neem cake 8 5 kg per palm.