Browsing by Author "Bhaskaran, R."
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Item Basal Stem Rot Disease of Coconut(1996-03) Bhaskaran, R.; Rajamannar, M.; Kumar, S.N.S.Item Ganoderma wilt disease of coconut(2007-02) Bhaskaran, R.; Rethinam, P.; Nambiar, K.K.N.Item Induction of Phenolics and Defense-related Enzymes in Coconut (cocos Nucifera L.) Roots Treated with Biocontrol Agents(Sociedade Brasileira de Fisiologia Vegetal, 2006-09) Karthikeyan, M.; Radhika, K.; Mathiyazhagan, S.; Bhaskaran, R.; Samiyappan, R.; Velazhahan, R.The effect of soil application of biocontrol agents (Pseudomonas fluorescens, Trichoderma viride and T. harzianum) in combination with chitin on induction of phenolics and defense enzymes in coconut roots infected with Ganoderma lucidum, the causal agent of Ganoderma disease, was investigated. Soil application of these biocontrol formulations in combination with chitin induced a significant increase in the activities of peroxidase (PO), polyphenol oxidase (PPO), phenylalanine ammonia-lyase (PAL), chitinase and b-1,3-glucanase in the G. lucidum infected palms. Activities of both PAL and PO reached maximum levels within 3 d while the activity of PPO reached the maximum level 6 d after application of a mixture of P. fluorescens, T. viride and chitin. Isozyme analysis revealed that unique PO3 and PPO2 isozymes were induced in coconut palms treated with P. fluorescens + T. viride + chitin. Accumulation of phenolics was recorded 3 d after treatment and reached maximum levels 9 d after treatment application. Activity of chitinase was significantly increased from the third day after treatment imposition and continued to increase up to 9 to 12 d in all treatments. Chitinase isozyme analysis revealed that a unique Chit3 isoform was induced in coconut roots treated with P. fluorescens + T. viride + chitin. The b-1,3-glucanase activity was maximum 9 d after treatment application. The mechanisms by which P. fluorescens + T. viride + chitin reduced the incidence of Ganoderma disease in coconut may be related to its ability to induce defense mechanisms in coconut palmsItem Management of Basal Stem Rot (Ganoderma) disease of Coconut using early diagnostic methods(2015-06) Karunanithi, K.; Bhaskaran, R.; Karthikeyan, M.; sarala, L.Item Management of lethal leaf blight disease of coconut in Thamil Nadu(2007-08) Bhaskaran, R.; Ramanathan, A.; Vaithilingam, R.Item Role of Neem Cake in the Control of Thanjavur Wilt of Coconut(1986) Gunasekaran, M.; Ramadoss, N.; Ramiah, M.; Bhaskaran, R.; Ramanathan, T.Application of neem cake increased the total population of fungi in the rhizOsphere region of coconut palm. It also Inhibited the growth of Ganoderma lucidum (Leye) Karst., the suspected pathogen of Thanjavur wilt of coconut Despite increase in population of rhizosphere fungi, neem cake application @ lOkg/palm/year was equal to the combined treatment of stem injection of aureofungin-sol--soil drenching of Bordeaux mixture 1% +neem cake application in its effectiveness in containing Thanjavur wilt of coconut. Moreover, there is a saving of approximately Rs. 20/ per palm by resorting to neem cake application over the present recommendation of the above combined treatment.Item Thanjavur Wilt Of Coconut(1989) Bhaskaran, R.; Rethinam, P.; Nambiar, K.K.N.Thanjavur wilt of coconut was first reported from Thanjavur district of Tamil Nadu, India in 1952. The disease has now spread throughout Tamil Nadu. Information available on the occurrence and spread of the disease in Tamil Nadu, symptoms, etiology and epidemiology of the disease, physiology of diseased palms, methods for early detection and management of the disease are reviewed.Item Weather data based descriptive models for prediction of coconut yield in different agro-climatic zones of India(2009-03) Naresh Kumar, S.; Rajagopal, V.; Cherian, V.K.; Siju Thomas, T.; Sreenivasulu, B.; Nagvekar, D.D.; Hanumanthappa, M.; Bhaskaran, R.; Vijayakumar, K.; Ratheesh Narayanan, M.K.; Amarnath, C.H.Weather variables play an important role in determining the coconut palm growth, development and yield. The influence of weather on nut yield in coconut starts from inflorescence initiation and lasts till nut maturity (44 months). Historical data on weather variables and coconut nut yield from different agro-climatic zones viz., Western coastal area – hot sub-humid-per-humid (Kasaragod – Kerala; Ratnagiri – Maharastra), hot semi-arid (Arisikere – Karnataka) and Eastern coastal plains- hot sub-humid (Veppankulam- Tamil Nadu; Ambajipeta- Andhra Pradesh) of India were used for developing models for prediction of coconut yield. The prediction models with 3- and 4-year lag had high R2 values. The models differed for usage of parameters in different agro-climatic zones, indicating the relative importance of these parameters in respective conditions for realizing the nut yield in coconut. Interestingly, the parameters used in models for western coastal area – hot sub-humid-per-humid are temperature and relative humidity, as indicated even in the classification of these areas. Models were verified for 2 years and prediction of yield during 1998-99 and 1999-2000 within 10% confidence level validated these models. The study indicates that the relative humidity and temperature play important role during the ontogeny of inflorescence and nut development. The descriptive models, developed based on weather data, can be used for prediction of coconut yield two to four years in advance with in acceptable range of accuracy. The yields to be realized can be bracketed within predicted range obtained from models using one, two, three, and four year lags. These models can also be used for prediction of coconut nut yield in the situations similar to those in the present study.