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

Ismail Hashim, . and Chew B. H., . Effects of fungicides and their combinations with nitrogen manuring and artificial defoliation on control of corynespora leaf fall of Hevea rubber. pp. 111-124. ISSN 1511-1768

The effectiveness of several fungicides and fungicide 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 benomyl 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 fungicide 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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Abstract

The effectiveness of several fungicides and fungicide 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 benomyl 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 fungicide 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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Item Type:	Article
AGROVOC Term:	Corynespora
AGROVOC Term:	Fungicides
AGROVOC Term:	Hevea
AGROVOC Term:	Rubber
AGROVOC Term:	Leaf removal
AGROVOC Term:	Plant diseases
AGROVOC Term:	Benomyl
AGROVOC Term:	Canopy
AGROVOC Term:	Defoliation
AGROVOC Term:	Chlorothalonil
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	28 Apr 2025 03:30
URI:	http://webagris.upm.edu.my/id/eprint/23317

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