Preliminary investigations into the chemical control of the cocoa moth podborer Acrocercops cramerella Snellen., in Sabah
In the past, conventional application of pesticides to the cocoa canopy and the use of systemic chemicals have shown little effect on cocoa moth podborer populations. Recent trials conducted over a period of 17 months have demonstrated that specific chemicals applied only onto the resting and ovipositing sites of the adult moth had the potential to reduce podborer infestations and loss of yield. Of the chemicals evaluated, deltamethrin, cypermethrin, fenvalerate, propoxur and 8-BHC were highly promising. Deltamethrin and propoxur in particular, were highly consistent in performance, effectively reducing pod-infestation at all three frequencies of application tested. For both these compounds, four to five consecutive sprays at 10-14 day intervals appears to be the optimum frequency of application. Spraying should be initiated in the trough of pod-production when the majority of cherelles are two to three months old. In one trial, four applications of deltamethrin and cypermethrin reduced podborer populations to negligible levels throughout a peak season, resulting in the saving of 15 per cent of the crop. Preliminary recommendations on the use of the technique are included for cocoa growers who may be considering spraying-programmes in the near future.
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| Format: | biblioteca |
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1984
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| Subjects: | THEOBROMA CACAO, ACROCERCOPS CRAMERELLA, INSECTOS DEPREDADORES DE LOS FRUTOS, CONTROL QUIMICO, INSECTICIDAS, ACCION SISTEMICA, CIPERMETRIN, FENVALERATO, PROPOSUR, CICLO VITAL, DOSIS DE APLICACION, PERDIDAS DE LA COSECHA, COSTOS, SABAH, |
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