The control of cacao swollen shoot disease in Nigeria
An account and analysis is presented of the work of the Nigerian Department of Agriculture in attempts to control cacao swollen shoot disease. The decision to abandon eradication measures in two heavily infected areas is partly responsible for the deterioration in the position in recent years. Virus is spreading without check and causing a progressive decline in yield in two abandoned areas, which are acting as dangerous foci of infection. The present situation in the abandoned areas is assessed and an outline given of possible development within them. The present survey system is described and some of the difficulties experienced by the inspection parties discussed. Details are also given of proposals intented to increase the efficiency of the inspection service, which partly determines the build-up of infection outside the abandoned areas. The routine measures used in attempts to eradicate virus from infected farms are described and their efficiency assessed. Until 1950 only trees found with symptoms were cut out, and only the smallest outbreaks were eradicated efficiently. Since 1950 the trees found with symptoms were cut out, together with the adjacent apparently healthy trees within 30 yards and virus was eradicated from the cacao around approximately two thirds of the treated villages. However, large numbers of apparently healthy trees were involved and coppicing experiments indicate that comparable success could have been achieved less drastically by treating outbreaks according to their size.
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| Format: | biblioteca |
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Ene
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| Subjects: | THEOBROMA CACAO, COCOA SWOLLEN SHOOT VIRUS, VIROSIS, CONTROL DE ENFERMEDADES, NIGERIA, |
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