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Coffee rust control with low volume spray application : Proceedings :

by Waller, J.M; Highland Coffee Research and Development Centre, Chiang Mai (Tailandia). Faculty of Agronomy; 1988 International Seminar on Coffee Technology Chiang Mai (Tailandia) 3-5 Feb 1988.
Publisher: Chiang Mai (Tailandia) 1988Description: p. 46-51.Subject(s): COFFEA ARABICA | HEMILEIA VASTATRIX | ENFERMEDADES FUNGOSAS | CONTROL QUIMICO | FUNGICIDAS | METODOS DE APLICACION | APLICACION A BAJO VOLUMEN | EQUIPO PARA CONTROL DE PLAGAS | BRASIL | ZONA ANDINA | COFFEA ARABICA | HEMILEIA VASTATRIX | FUNGAL DISEASES | CHEMICAL CONTROL | FUNGICIDES | APPLICATION METHODS | PEST CONTROL EQUIPMENT | BRAZIL | ANDEAN ZONE | COFFEA ARABICA | HEMILEIA VASTATRIX | MALADIE FONGIQUE | LUTTE CHIMIQUE | FONGICIDE | METHODE D'APPLICATION | MATERIEL DE LUTTE ANTIPARASITE | BRESIL | ZONE ANDINEOnline Resources: Click here to access online Summary: Chemical control of coffee rust was originally achieved by using high volume applications of Bordeaux mixture at 1,000 l/ha, partly to ensure adequate underleaf cover. With the use of mistblowers lower volumes were possible and because many coffee-growing areas in developing countries comprise smallholdings manual spraying became popular. Difficulties in obtaining and carrying large volumes of water for spraying triggered the need for trials on low-volume application through manual spraying, which were conducted in major coffee growing areas. Results from e.g. Brazil showed that adequate control of coffee rust could be obtained by using 2-4 kg copper fungicide at volumes as low as 50 l/ha. Ultra low volume (ULV) spraying with spinning-disc atomizers gave also good results. Various types of ULV-applicators are discussed in this paper, on trial in South and Central America, Andean countries and Kenya, as well as degree of rust control and efficiency of the equipment. Furthermore the use of air assisted electrostatically charged sprays, tried out in Colombia, is evaluated on its merits. Finally the feature of redistribution of spray droplets from top to bottom side of the leaves is dealt with and its advantage in terms of reduced quantities of fungicide needed by increasing the efficiency of the underleaf deposits
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Chemical control of coffee rust was originally achieved by using high volume applications of Bordeaux mixture at 1,000 l/ha, partly to ensure adequate underleaf cover. With the use of mistblowers lower volumes were possible and because many coffee-growing areas in developing countries comprise smallholdings manual spraying became popular. Difficulties in obtaining and carrying large volumes of water for spraying triggered the need for trials on low-volume application through manual spraying, which were conducted in major coffee growing areas. Results from e.g. Brazil showed that adequate control of coffee rust could be obtained by using 2-4 kg copper fungicide at volumes as low as 50 l/ha. Ultra low volume (ULV) spraying with spinning-disc atomizers gave also good results. Various types of ULV-applicators are discussed in this paper, on trial in South and Central America, Andean countries and Kenya, as well as degree of rust control and efficiency of the equipment. Furthermore the use of air assisted electrostatically charged sprays, tried out in Colombia, is evaluated on its merits. Finally the feature of redistribution of spray droplets from top to bottom side of the leaves is dealt with and its advantage in terms of reduced quantities of fungicide needed by increasing the efficiency of the underleaf deposits

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