Jose AbrahamRawther, T.S.S.Jacob, P.M.Robert Cecil2014-08-132014-08-131987J.Plantn.Crops 1987 v-15 i-1 p-38-41http://hdl.handle.net/123456789/4801Correlation and regression studies were carried out on yield and disease index of root (wilt) affected coconut palms. The significant negative correlations obtained between, yield and disease index revealed the debilitating impact of the disease on yield. Regression equations fitted on data collected from 500 palms aged above 30 years in the farmers field showed an average reduction of O.S nuts per index while it was 1.3 nuts per index for the younger palms (aged below 13 years) under the well managed farm conditions. This indicates that the impact of disease is more in the case of palms which contract disease during the early years of bearing. However, the average yield of the palms under the well managed conditions were consistantly high upto the index level of 50 points, showing the effect of good management on maintaining the yield.enArticle