Some factor influencing the performance of spray programmes for the control of coffee berry disease
In 1968 in a field trial at Kamundu, Kenya, early-season (Jan.-Mar.) sprays of copper, captafol and Tuzet failed to control of coffee berry disease (CBD), in the late (main) crop of cultivars S.L.28 and S.L.34. Copper and captafol caused some delay in disease development but eventually infection reached over 50 in all treatmentsand final yields of sprayed plots were below those from unsprayed plots. In a similar trial in 1969 at Yara on the cultivar French Mission a similar spray programme achieved significant benefits: copper and captafol kept the level of disease below 20 and gave improved yields compared with unsprayed plots. A continuation of the sprays until June increased yields still further. In a second trial in 1968 at Kiamara on the cultivar French Mission substantial quantities of early crop were present and disease in this was effectively controlled by early-season sprays of captafol, although the late crop on the same trees became severely affected. Removal of this overlapping early crop in January caused only a limited delay in disease development in the late crop, despite the fact that with some treatments this stripping resulted in the removal of a large source of potential inoculum from the tree. The results are considered in relation to differences between seasons and fungicides and it is concluded that further evidence has been provided for the importance of the protective role of fungicides against CBD. It is considered that stripping of the early crop is never likely to ber a necessary management practice
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| Format: | biblioteca |
| Published: |
1971
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| Subjects: | ENFERMEDADES FUNGOSAS, COLLETOTRICHUM, CONTROL QUIMICO, METODOS DE APLICACION, PULVERIZACION, COLLETOTRICHUM COFFEANUM, ASPERSIONES, |
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| Summary: | In 1968 in a field trial at Kamundu, Kenya, early-season (Jan.-Mar.) sprays of copper, captafol and Tuzet failed to control of coffee berry disease (CBD), in the late (main) crop of cultivars S.L.28 and S.L.34. Copper and captafol caused some delay in disease development but eventually infection reached over 50 in all treatmentsand final yields of sprayed plots were below those from unsprayed plots. In a similar trial in 1969 at Yara on the cultivar French Mission a similar spray programme achieved significant benefits: copper and captafol kept the level of disease below 20 and gave improved yields compared with unsprayed plots. A continuation of the sprays until June increased yields still further. In a second trial in 1968 at Kiamara on the cultivar French Mission substantial quantities of early crop were present and disease in this was effectively controlled by early-season sprays of captafol, although the late crop on the same trees became severely affected. Removal of this overlapping early crop in January caused only a limited delay in disease development in the late crop, despite the fact that with some treatments this stripping resulted in the removal of a large source of potential inoculum from the tree. The results are considered in relation to differences between seasons and fungicides and it is concluded that further evidence has been provided for the importance of the protective role of fungicides against CBD. It is considered that stripping of the early crop is never likely to ber a necessary management practice |
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