A comparative evaluation of triadimenol with tebuconazole a new fungicide for the control of vsd vascular streak dieback of cocoa in Malaysia

Choong C.T., . and Ng K.Y., . (1990) A comparative evaluation of triadimenol with tebuconazole a new fungicide for the control of vsd vascular streak dieback of cocoa in Malaysia. [Proceedings Paper]

The present commercial plantings of cocoa in Malaysia are variously susceptible to the most serious fungal disease the vascular streak dieback VSD. Triadimenol and to a lesser extent bitertanol are currently used for VSD control in nurseries and young field-plantings. Another similar compound tebuconazole was recently extensively evaluated in 1988/89 and the results are herein reported. Tebuconazole is a systemic sterol biosynthesis-inhibiting triazol fungicide active against numerous economically important diseases of crops grown not only in the temperature but also in the sub-tropic and tropical regions. Prophylactic foliar spray applications of tebuconazole in the nurseries at 625 ul/1 at 7 and 14 day intervals were effective providing complete protection with no observed phytotoxicity during the 6 months observation. At a similar rate and applied at 7 day intervals triadimenol provided 93-98 percent protection. At 1250 ul/1 and applied at 14 day intervals triadimenol provided complete protection. Soil-drenching of tebuconazole on nursery plants at monthly intervals of 5 to 10 mg a.i. per plant provided 97 percent protection and triadimenol provided 100 percent protection after 6 applications. In young field-plantings both tebuconazole and triadimenol when foliar-applied at 12500 ul/1 at 14 day intervals provided efficacy of about 95 percent without phytotoxic effect.

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Abstract

The present commercial plantings of cocoa in Malaysia are variously susceptible to the most serious fungal disease the vascular streak dieback VSD. Triadimenol and to a lesser extent bitertanol are currently used for VSD control in nurseries and young field-plantings. Another similar compound tebuconazole was recently extensively evaluated in 1988/89 and the results are herein reported. Tebuconazole is a systemic sterol biosynthesis-inhibiting triazol fungicide active against numerous economically important diseases of crops grown not only in the temperature but also in the sub-tropic and tropical regions. Prophylactic foliar spray applications of tebuconazole in the nurseries at 625 ul/1 at 7 and 14 day intervals were effective providing complete protection with no observed phytotoxicity during the 6 months observation. At a similar rate and applied at 7 day intervals triadimenol provided 93-98 percent protection. At 1250 ul/1 and applied at 14 day intervals triadimenol provided complete protection. Soil-drenching of tebuconazole on nursery plants at monthly intervals of 5 to 10 mg a.i. per plant provided 97 percent protection and triadimenol provided 100 percent protection after 6 applications. In young field-plantings both tebuconazole and triadimenol when foliar-applied at 12500 ul/1 at 14 day intervals provided efficacy of about 95 percent without phytotoxic effect.

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Item Type:	Proceedings Paper
Additional Information:	2 tables 10 ref.; Summary En
AGROVOC Term:	THEOBROMA CACAO
AGROVOC Term:	FUNGICIDAS
AGROVOC Term:	TRIADIMENOL
AGROVOC Term:	ENFERMEDADES VASCULARES
AGROVOC Term:	ENFERMEDADES DE LAS PLANTAS
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:26
URI:	http://webagris.upm.edu.my/id/eprint/15027

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