ISHS Acta Horticulturae 740: I International Symposium on Papaya
EFFECT OF FOLIAR APPLICATION OF LIGNITE FLY ASH ON THE MANAGEMENT OF PAPAYA LEAF CURL DISEASE |
| Authors: | A. Eswaran, K. Manivannan |
| Keywords: | papaya, lignite fly ash, papaya leaf curl, Bemisea tabaci, foliar application |
| Abstract:
Studies were conducted on the effect of foliar application of lignite fly ash (LFA) dust on papaya leaf curl virus disease and vector (Bemisea tabaci) population. The treatments include various concentrations of LFA administered at different days after planting (DAT). LFA is the by-product from the combustion of pulverized coal / lignite in thermal power plants of India and has high silica content. The study revealed that foliar application of LFA dust at 2 kg per plant at 90 and 120 DAT was very effective in controlling papaya leaf curl virus disease and its vector. Application of LFA two times at 90 and 120 DAT was more effective over single applications at 30, 60 and 90 and 120 DAT. The fly ash stuck to leaf surface for a period of 9 to 12 days. Further application of lignite fly ash reduces the population of vector, thereby resulting in relatively disease free papaya crop. Plants treated with LFA dust at 2 kg / plant on 90 and 120 DAT also increased phenol and crude protein contents but reduced sugar and amino nitrogen contents of the leaves. It is evident from this study that the application of LFA dust profoundly increased the resistance mechanism of the plant and ultimately enhanced the fruit yield. | |
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