Studies on the chemical control of Phytophthora palmivora (Butl.) Butl. on Theobroma cacao L. in Nigeria, 5: Comparisons of three spraying machines for applying fungicides
A pneumatic knapsack sprayer, a motorized shoulder-mounted mist-blower and an automatic tractor-mounted mist-blower have been compared for efficacy in controlling black-pod disease of cocoa and for cost of operation. Preliminary evaluation of these machines was carried out using fungicide/dye mixtures applied to artificial paper-covered pods. Fungicide deposits for different methods of sprayig were determined from the simple colorimetric estimation of the dye. On the basis of these tests three blocks of Amazon cocoa were sprayed with cuprous oxide during the black-pod season of 1962. Both knapsack machines gave good control of the disease but the cost of spraying with the mist-blower was three times that for the more simple machine. The tractor-mounted machine was expensive to use and gave poor disease control. It is suggested that the use of mist-blowers might be economic only in areas where labour is expensive or scarce, and where yields and black-pod losses are high.
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| Format: | biblioteca |
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| Subjects: | THEOBROMA CACAO, PHYTOPHTHORA PALMIVORA, ENFERMEDADES FUNGOSAS, CONTROL QUIMICO, FUNGICIDAS, EQUIPO PARA CONTROL DE PLAGAS, PULVERIZADORES, CLONES AMAZONAS, NIGERIA, |
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