Screening of some systematic fungicides against Oncobasidium theobromae and translocation studies of benomyl in cocoa

Mohammad Musa Mohd Jamil, . and Tey C.C., . (1986) Screening of some systematic fungicides against Oncobasidium theobromae and translocation studies of benomyl in cocoa. [Proceedings Paper]

Several systemic fungicides from the benzimidazoles the carboxamides the morpholines the piperidines and the imidazoles groups were selected for their activities against Basidiomycetes and in the case of benzimidazole for its broad-spectrum action. These selected chemicals were screened in vitro and on seedlings against Oncobasidium theobromae. Except for triademefon and oxycarboxin most of the chemicals tested were able to totally inhibit mycelial growth at 10 ug/ml whilst benomyl and pyracarbolid at 5 ug/ml. Screening of these chemicals on seedlings by drenching and spraying showed that benomyl was able to protect the seedlings. Experiments were carried out to study the translocation of benomyl on seedlings and mature trees. Seedlings growing in pots in loamy soil were able to accumulate appreciable amounts of the fungicide in the shoots only 8 hrs. after the application of the chemical by drenching. Mature cocoa trees growing in alluvial clay of Hilir Perak Malaysia were also applied with benomyl by drenching and burying the chemical around the root region. This was carried out during the wet period. The young flushes were then sampled and the amounts of fungicide in the young flushes were determined. Three days after the application it was found that the amounts of benomyl in the flushes were more than the amounts required to totally inhibit mycelial growth of O. theobromae. The fungitoxicity of the flushes persisted for more than 30 days

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Abstract

Several systemic fungicides from the benzimidazoles the carboxamides the morpholines the piperidines and the imidazoles groups were selected for their activities against Basidiomycetes and in the case of benzimidazole for its broad-spectrum action. These selected chemicals were screened in vitro and on seedlings against Oncobasidium theobromae. Except for triademefon and oxycarboxin most of the chemicals tested were able to totally inhibit mycelial growth at 10 ug/ml whilst benomyl and pyracarbolid at 5 ug/ml. Screening of these chemicals on seedlings by drenching and spraying showed that benomyl was able to protect the seedlings. Experiments were carried out to study the translocation of benomyl on seedlings and mature trees. Seedlings growing in pots in loamy soil were able to accumulate appreciable amounts of the fungicide in the shoots only 8 hrs. after the application of the chemical by drenching. Mature cocoa trees growing in alluvial clay of Hilir Perak Malaysia were also applied with benomyl by drenching and burying the chemical around the root region. This was carried out during the wet period. The young flushes were then sampled and the amounts of fungicide in the young flushes were determined. Three days after the application it was found that the amounts of benomyl in the flushes were more than the amounts required to totally inhibit mycelial growth of O. theobromae. The fungitoxicity of the flushes persisted for more than 30 days

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Item Type:	Proceedings Paper
Additional Information:	Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. SB267 I61 1984 Call Number
AGROVOC Term:	Theobroma cacao
AGROVOC Term:	Mycoses
AGROVOC Term:	Translocation
AGROVOC Term:	Evaluation
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:25
URI:	http://webagris.upm.edu.my/id/eprint/14394

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