COPPER AND TOBACCO are two of the world's traditional commodities with the former playing a crucial role in the successful production of the latter. Tobacco plants are attacked by a wide range of fungal pathogens from the seedling stage in the nurserybed to mature plants in the field bearing leaves ready for picking. Copper fungicides as salts of elemental copper are unrivalled in the range of fungal pathogens they can control as well as showing good activity against plant pathogenic bacteria. The divalent copper ion (Cu2+) which is the active principle of copper containing fungicides is virtually unique in possessing this dual fungicidal and bactericidal action.
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