Browsing by Author "Sabitha Doraisamy"

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    Coconut eriophyid mite (Aceria guerreronis Keifer) - An update
    (2007-02-08) Nampoothiri, K.U.K.; Nair, C.P.R.; Kannaiyan, S.; Sabitha Doraisamy; Saradamma, K.; Naseema Beevi, S.; Sreerama Kumar, P.
    Coconut eriophyid mite was spotted in India in 1998. The pest later established in various locations of Kerala, Karnataka and Tamil Nadu. The mite infests buttons and colonising inside the perianth sucks sap from the tender tissues resulting in button shedding, reduction of both nut size and kernel content as well as loss of husk. The life cycle is completed in.7-10 days. The pest can be managed by periodic spray of insecticides like monocrotophos, dicofol and wettable sulfur. Botanicals such as neem oil, garlic, fish oil, rosin soap etc are preferred, though less effective, due to their ecofriendliness. Proper management of the palms helps to contain the pest and reduce economic loss. Hirsutella thompsonii is regarded as a potential biological agent. No cultivar is resistant to the pest. but%cer tain features like round shape of nut, tight petals etc. offer some tolerance. An uptodate review on the pest in India is presented along with suggestions on future course of action.
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    Effect of plant products on the management of basal stem rot (Ganoderma) of coconut
    (2007) Karunanithi, K.; Sarala, L.; Rabindran, R.; Sabitha Doraisamy; Rajarathinam, S.; Khan, H.H.
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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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    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.