Eficiencia técnica e economica de pulverizacoes com fungicidas de cobre a ultra baixo volume no controle da podridao parda do cacaueiro
This paper deals with a comparison of three fungicides in the control of cacao Black Pod Rot Disease made at two private farms in Bahia, in 1976. They were Copper Sandoz (R) (Cuprous oxide), Oxicloreto Sandoz (R) (Copper Oxichloride), and Kocide 101 (R) (Copper hydroxide). Four applications were made during the year using 4 g of metalic copper/tree, applied at a high-volume of 160 liters in water and with the sticker Ag Ben (R), and 2 g/tree applied in ultra-low volume of 11 liter in water with anti-evaporant. The periodic removal of diseased cacao pods was effective in only one of the farms, giving 50 per cent control. Cuprous oxide in high volume applications with sticker was the most effective treatment giving 90 per cent control. Copper hydroxide and copper oxicloride in high volume with sticker gave equally efficient control as did cuprous oxide without sticker, 70 per cent. The ultra low volume sprays were 21 per cent less effective than the high volume sprays. The cuprous oxide gave up to 67 per cent control and was neither influenced by site nor sanitary control measures. In as much as a sticker increased by 20 per cent the effectiveness of cuprous oxide in the control of Black Pod Disease, using ultra low volume applications, it is suggested that a sticker be used. The economics of the treatment is discussed in relation to the technical efficiency of the chemical control. The technical basis for the economical control of the Black Pod Disease is based on the net profit and the selling price of cacao. This study revealed that the minimum price for which the farmers could have recovered their investments in disease control was Cr 58/arroba or approximately 30 per cent of the real selling price, Cr 154,70
| Main Authors: | , , |
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| Format: | biblioteca |
| Published: |
1977
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| Subjects: | THEOBROMA CACAO, PHYTOPHTHORA PALMIVORA, PODREDUMBRES, FUNGICIDAS, COMPUESTO ORGANICO DEL COBRE, PULVERIZACION, ENFERMEDADES FUNGOSAS, METODOS DE APLICACION, BAHIA, BRASIL, |
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| Summary: | This paper deals with a comparison of three fungicides in the control of cacao Black Pod Rot Disease made at two private farms in Bahia, in 1976. They were Copper Sandoz (R) (Cuprous oxide), Oxicloreto Sandoz (R) (Copper Oxichloride), and Kocide 101 (R) (Copper hydroxide). Four applications were made during the year using 4 g of metalic copper/tree, applied at a high-volume of 160 liters in water and with the sticker Ag Ben (R), and 2 g/tree applied in ultra-low volume of 11 liter in water with anti-evaporant. The periodic removal of diseased cacao pods was effective in only one of the farms, giving 50 per cent control. Cuprous oxide in high volume applications with sticker was the most effective treatment giving 90 per cent control. Copper hydroxide and copper oxicloride in high volume with sticker gave equally efficient control as did cuprous oxide without sticker, 70 per cent. The ultra low volume sprays were 21 per cent less effective than the high volume sprays. The cuprous oxide gave up to 67 per cent control and was neither influenced by site nor sanitary control measures. In as much as a sticker increased by 20 per cent the effectiveness of cuprous oxide in the control of Black Pod Disease, using ultra low volume applications, it is suggested that a sticker be used. The economics of the treatment is discussed in relation to the technical efficiency of the chemical control. The technical basis for the economical control of the Black Pod Disease is based on the net profit and the selling price of cacao. This study revealed that the minimum price for which the farmers could have recovered their investments in disease control was Cr 58/arroba or approximately 30 per cent of the real selling price, Cr 154,70 |
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