4. SYMPTOMATOLOGY AND YIELD LOSS DUE TO YELLOWING DISEASE OF COCONUT- A LETHAL MALADY IN SOUTHERN KERALA by C. ANJU, M. SUHARBAN AND P. J. JOSEPH
Abstract
A detailed symptomatological analysis of yellowing disease of coconut and survey on its occurrence and severity were conducted at the Instructional Farm, College of Agriculture, Vellayani. The symptoms were characterized by rapid mid whorl yellowing, abnormal and near total shedding of nuts and flowers, drying of inflorescence and spadix and intense leaf spots and blights, often culminating in the death of the palm within a short period. The survey indicated 1.96% incidence of yellowing disease in the farm and an alarming 60.8% of the infected palms had either total loss of productivity (37.5%) or had less than 10 nuts/ palm/ year (23.3%).
KEY WORD: Coconut, Disease Severity Index, Symptomatology, Yellowing Disease.
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