IDENTIFICATION OF ROOT (WILT) DISEASED COCONUT PALMS BEFORE VISUAL SYMPTOM EXPRESSION
Keywords:
Coconut Palms, Visual Symptom
Abstract
Determination of stomatal resistance (rs) and leaf water potential (ψ) were employed as techniques to distinguish coconut palms (Cocos nucifera L.) devoid of foliar symptoms ('apparently healthy') from those with symptorns of wilt disease viz. flaccidity, yellowing and necrosis ('wilt diseased'). Infected palms are characterized by low stomatal diffusive resistance and reduction in leaf water potential. Among the apparently healthy palms, some exhibited high rs and high ψ, characteristic of truly healthy palms, while others had the trend similar to the 'wilt' diseased palms. The latter group of palms was considered as disease 'suspects' and was closely monitored for the symptom expression. In about 10 to 14 months, all the palms 'suspected' to be diseased had the visual symptoms of the disease.
References
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DWIVEDI, R.S., MATHEW., RAY, P.K., SUMATHYKUT¬TYAMMA A,B. & NINAN, S. (1977). Rapid biochemical test to detect root (wilt) disease of coconut. Current Science 46:611 612.
JOSEPH, T. & SHANTHA,P. (1963). Studies on a colour test for the root (wilt) disease of coconut. 50th Indian Science Congress 3:618.
KORNER, C. (1981). Stomatal behaviour and water potentialin apricot with symptoms of wilt disease. Angew Botanik 55:469 476.
MATTEONI, J.A. & SINCLAIR, W.A. (1983). Stomatal closure in plants infected with mycoplasma like organisms. Phytopathology 73:398 402.
Mc COY, R.E. (1983). Lethal Yellowing of palms. Gainsville, University of Florida.
Mc DONOUGH, J. & ZIMMERMANN, M.H. (1979). Effect of lethal yellowing on xylem pressure potential in coconut palms. Principes 23:132 137.
MILBURN, J.A. & DAVIS, T.A. (1973). Role of pressure in xylem transport of coconut and other palms. Physiologia Plantarum 29:415 420.
MILBURN, J.A. & ZIMMERMANN, M.H. (1977). Preliminary studies on sap flow in Cocos nucifera L. 1. Water relations in xylem transport. New Phytologist 79:535 541.
RADHA, K. & LAL, S.B. (1972). Diagnostic symptoms of root (wilt) disease of coconut. Indian Journal of Agricultural Science 42:410 413.
RAJAGOPAL, V., MATHEW, C. & VARKEY, T. (1982). Determination of stornatal resistance and transpiration in the leaves of coconut (Cocos nucifera L.) using the steady state porometer. Proceedings of the International Work¬shop on Special Problems in Physiological Investigations of Tree Crops TREEPHYSINDIA'82. M.R. SETHURAJ, G.GURURAJARAO. & A.S. RAGHAVENDRA (eds), Published by Rubber Research Institute of India, Kottayarn, pp. 100 104.
RAJAGOPAL, V., PATIL, K.D. & SUMATHYKUTTYAMMA, B. (1986). Abnormal stomatal opening in coconut palms affected with root (wilt) disease Journal of Experimental Botany 37:1398 1405.
RAJAGOPAL, V., SUMATHYKUTTYAMMA, B. & PATIL, K.D. (1987a). Water relations of coconut palms affected with root (wilt) disease. New Phytologist 105:289 293.
RAJAGOPAL, V., SASIKALA, M., SUMATHYKUT TYAMMA, B. CHEMPAKAM, B. & RAWTHER, T.S. (1987b). Early diagnostic techniques on the root (wilt disease of coconut (India). Philippine Journal of Coconut Studies (accepted).
RAJAGOPAL, V., RAMADASAN, A., KASTURIBAI, K.V. & BALASIMHA, D.(1988). Influence of irrigation on leaf water relations and dry matter production in coconut palms. Irrigation Science (accepted).
SOLOMON, J.J., SASIKALA, M. & SHANTHA, P. (1983a). A serological test for the detection of root (wilt) disease of coconut. In: Coconut Research and Development. N.M. NAYAR (ed), Wiley Eastern Limited, New Delhi, pp. 401¬405.
SOLOMON, J.J,. GOVINDANKUTTY, M.P. & NIENHAUS, P. (1983b). Association of mycoplasma like organisms with the root (wilt) disease of coconut in India. Zeitschkrift Pflanzenkrankheiten 90:295 297.
TURNER, N.C. & GRANITI, A. (1976). Stornatal response of two almond varieties to fusicoccin. Physiological Plant Patholog,y 9:1,75 182.
GEORGE, M.V. & RADHA, K. (1973). Computation of disease index of root (wilt) disease of coconut. Indian Journal of Agricultural Science 43:366 370.
DWIVEDI, R.S., MATHEW., RAY, P.K., SUMATHYKUT¬TYAMMA A,B. & NINAN, S. (1977). Rapid biochemical test to detect root (wilt) disease of coconut. Current Science 46:611 612.
JOSEPH, T. & SHANTHA,P. (1963). Studies on a colour test for the root (wilt) disease of coconut. 50th Indian Science Congress 3:618.
KORNER, C. (1981). Stomatal behaviour and water potentialin apricot with symptoms of wilt disease. Angew Botanik 55:469 476.
MATTEONI, J.A. & SINCLAIR, W.A. (1983). Stomatal closure in plants infected with mycoplasma like organisms. Phytopathology 73:398 402.
Mc COY, R.E. (1983). Lethal Yellowing of palms. Gainsville, University of Florida.
Mc DONOUGH, J. & ZIMMERMANN, M.H. (1979). Effect of lethal yellowing on xylem pressure potential in coconut palms. Principes 23:132 137.
MILBURN, J.A. & DAVIS, T.A. (1973). Role of pressure in xylem transport of coconut and other palms. Physiologia Plantarum 29:415 420.
MILBURN, J.A. & ZIMMERMANN, M.H. (1977). Preliminary studies on sap flow in Cocos nucifera L. 1. Water relations in xylem transport. New Phytologist 79:535 541.
RADHA, K. & LAL, S.B. (1972). Diagnostic symptoms of root (wilt) disease of coconut. Indian Journal of Agricultural Science 42:410 413.
RAJAGOPAL, V., MATHEW, C. & VARKEY, T. (1982). Determination of stornatal resistance and transpiration in the leaves of coconut (Cocos nucifera L.) using the steady state porometer. Proceedings of the International Work¬shop on Special Problems in Physiological Investigations of Tree Crops TREEPHYSINDIA'82. M.R. SETHURAJ, G.GURURAJARAO. & A.S. RAGHAVENDRA (eds), Published by Rubber Research Institute of India, Kottayarn, pp. 100 104.
RAJAGOPAL, V., PATIL, K.D. & SUMATHYKUTTYAMMA, B. (1986). Abnormal stomatal opening in coconut palms affected with root (wilt) disease Journal of Experimental Botany 37:1398 1405.
RAJAGOPAL, V., SUMATHYKUTTYAMMA, B. & PATIL, K.D. (1987a). Water relations of coconut palms affected with root (wilt) disease. New Phytologist 105:289 293.
RAJAGOPAL, V., SASIKALA, M., SUMATHYKUT TYAMMA, B. CHEMPAKAM, B. & RAWTHER, T.S. (1987b). Early diagnostic techniques on the root (wilt disease of coconut (India). Philippine Journal of Coconut Studies (accepted).
RAJAGOPAL, V., RAMADASAN, A., KASTURIBAI, K.V. & BALASIMHA, D.(1988). Influence of irrigation on leaf water relations and dry matter production in coconut palms. Irrigation Science (accepted).
SOLOMON, J.J., SASIKALA, M. & SHANTHA, P. (1983a). A serological test for the detection of root (wilt) disease of coconut. In: Coconut Research and Development. N.M. NAYAR (ed), Wiley Eastern Limited, New Delhi, pp. 401¬405.
SOLOMON, J.J,. GOVINDANKUTTY, M.P. & NIENHAUS, P. (1983b). Association of mycoplasma like organisms with the root (wilt) disease of coconut in India. Zeitschkrift Pflanzenkrankheiten 90:295 297.
TURNER, N.C. & GRANITI, A. (1976). Stornatal response of two almond varieties to fusicoccin. Physiological Plant Patholog,y 9:1,75 182.
GEORGE, M.V. & RADHA, K. (1973). Computation of disease index of root (wilt) disease of coconut. Indian Journal of Agricultural Science 43:366 370.
Published
1989-06-01
How to Cite
V. Rajagoval, & B. Sumathykuttyamma. (1989). IDENTIFICATION OF ROOT (WILT) DISEASED COCONUT PALMS BEFORE VISUAL SYMPTOM EXPRESSION. CORD, 5(02), 34. https://doi.org/10.37833/cord.v5i02.227
Section
Articles
