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Initial screening of fungicides for the control of vascular streak dieback disease on nursery cocoa plants

by Chung, G.F.
Publisher: 1983Subject(s): THEOBROMA CACAO | VIVEROS | ONCOBASIDIUM THEOBROMAE | ENFERMEDADES FUNGOSAS | FUNGICIDAS | ACCION SISTEMICA | FORMULACIONES | METODOS DE APLICACION | MALASIA | THEOBROMA CACAO | PLANT NURSERIES | ONCOBASIDIUM THEOBROMAE | FUNGAL DISEASES | FUNGICIDES | SYSTEMIC ACTION | FORMULATIONS | APPLICATION METHODS | MALAYSIA | THEOBROMA CACAO | PEPINIERE | ONCOBASIDIUM THEOBROMAE | MALADIE FONGIQUE | FONGICIDE | ACTION SYSTEMIQUE | FORMULATION | METHODE D'APPLICATION | MALAISIE In: Planter (Malasia) v. 59(689) p. 339-343Summary: Eight fungicides were tested against vascular streak dieback (VSD) on cocoa seedlings placed under infected mature cocoa so as to maximise the risk of infection. Through observations, nurseries are prone to infection and the young seedlings tend to be particularly susceptible. Many infected plants die. However, there is also a risk of carrying the disease to the field in apparently healthy plants. This helps to start an infection cycle from the early life of a planting. Only bitertanol indicated the possibility of prophylactic control. It gave complete protection in the conditions used, i.e. spraying at a concentration of 0.05 per cent a.i. to slight run-off, at both the weekly and fortnightly intervals tested. Further tests are recommended to assess the value of various application rates and intervals, to protect susceptible 'buddings' in infected mature cocoa, and severe epidemic cases in mature cocoa.
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Eight fungicides were tested against vascular streak dieback (VSD) on cocoa seedlings placed under infected mature cocoa so as to maximise the risk of infection. Through observations, nurseries are prone to infection and the young seedlings tend to be particularly susceptible. Many infected plants die. However, there is also a risk of carrying the disease to the field in apparently healthy plants. This helps to start an infection cycle from the early life of a planting. Only bitertanol indicated the possibility of prophylactic control. It gave complete protection in the conditions used, i.e. spraying at a concentration of 0.05 per cent a.i. to slight run-off, at both the weekly and fortnightly intervals tested. Further tests are recommended to assess the value of various application rates and intervals, to protect susceptible 'buddings' in infected mature cocoa, and severe epidemic cases in mature cocoa.

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