Abstract - Effects of fungicides and their combinations with nitrogen manuring and artificial defoliation on control of corynespora leaf fall of heavea rubber


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	Publications of MRB Latest Publications MRB Digest Journal of Rubber Research 3^rd Qtr 2008 Vol 11(3) 2^nd Qtr 2008 Vol 11(2) 1^st Qtr 2008 Vol 11(1) 4^th Qtr 2007 Vol 10(4) 3^rd Qtr 2007 Vol 10(3) 2^nd Qtr 2007 Vol 10(2) 1^st Qtr 2007 Vol 10(1) 1^st Qtr 2006 Vol 9(1) 2^nd Qtr 2006 Vol 9(2) 3^rd Qtr 2006 Vol 9(3) 4^th Qtr 2006 Vol 9(4) Submit paper/article Order Form	Abstract Effects of Fungicides and their Combinations with Nitrogen Manuring and Artificial Defoliation on Control of Corynespora Leaf Fall of Hevea Rubber The effectiveness of several fungicides and fungcide combinations with artificial defoliation or increased nitrogen manuring on control of Corynespora leaf fall on mature rubber was evaluated for several years. Benomyl performed better than chlorothalonil, mancozeb, propineb or prochloraz for the control of the disease as infection was lower and canopy density was higher in plots treated with nenomyl as compared to other treatments. Six rounds of fungicide applications produced better results than four rounds. Alternate applications of benomyl and chlorothalonil produced higher canopy density than individual fungicide treatment in certain years. The effectiveness of combining benomyl with artificial defoliation or increased nitrogen manuring was also evaluated. At the beginning of the season, benomyl, benomyl + artificial defoliation and benomyl + nitrogen manuring produced lower infection and percentage defoliation, and higher canopy density than the untreated control plots. The increase in canopy density was significant at the early season of the year. The canopy density dropped significantly and by the end of the year there was little difference between treated and untreated plots. The results indicate that funicide and the other treatments are effective in improving the canopy density of trees affected by Corynespora leaf fall, however the economic benefit has to be looked into.
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