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L'irrigation precoce do cafeier Arabica au Cameroun; methode moderne de controle de l'anthracnose des baies (Colletotrichum coffeanum Noack sensu Hindorf) integree aux pratiques culturales; assurance pour une production reguliere de haut niveau :

by Muller, R.A; Association Scientifique Internationale du Café, Paris (Francia); 8. Colloque Scientifique International sur le Café Abidjan (Costa de Marfil) 28 Nov-3 Dic 1977.
Publisher: París (Francia) 1979Description: p. 489-506.Subject(s): COFFEA ARABICA | ENFERMEDADES DE LAS PLANTAS | COLLETOTRICHUM | ENFERMEDADES FUNGOSAS | RIEGO | PRODUCCION | COLLETOTRICHUM COFFEANUM | COFFEA ARABICA | PLANT DISEASES | COLLETOTRICHUM | FUNGAL DISEASES | IRRIGATION | PRODUCTION | COLLETOTRICHUM COFFEANUM | COFFEA ARABICA | MALADIE DES PLANTES | COLLETOTRICHUM | MALADIE FONGIQUE | IRRIGATION | PRODUCTION | COLLETOTRICHUM COFFEANUMOnline Resources: Click here to access online Summary: The susceptibility of the Arabica coffee tree to the coffee berry disease (Colletotrichum coffeanum Noack sensu Hindorf) is variable: the severity of the attacks arises from the coincidence of the early stages of the fruits, which are the mosts susceptible, with a rainy period favourable to the pathogen. Early irrigation leads to the flowering of the coffee trees six to nine weeks before the rains; therefore, the stages of susceptibility of the fruits are located during the dry period and escape the infection. Early irrigation stimulates the growth of the tree and the sporulation of the two Hemileia (Hemileia vastatrix and H. coffeicola) pathogens of the leaf rusts" as soon as the rains begin, a very heavy infection leads to attack levels much higher than under natural conditions. Nevetheless, the early irrigation induces, before these intense attacks of the rusts, the formation of a leaf canopy which is twice on thrice more important than under natural conditions. This important canopy, which is safe from attacks during the dry period, has an intense photosynthetic activity, Yet, the rust attacks are so strong that this benefic effect seems finaly completely annihilated. Therefore, the early irrigation, which suppresses five or seven treatments against the coffee berry disease, does not avoid the use of fungicides; three treatments against the rusts remain necessary. By multiplying by two or three the foliar flushes, the early irrigation multiplies accordingly the number of nodes on which flowers are to form: this modern method of control of the coffee berry disease, integrated to agricultural techniques, is a way to ensure high level regular production
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The susceptibility of the Arabica coffee tree to the coffee berry disease (Colletotrichum coffeanum Noack sensu Hindorf) is variable: the severity of the attacks arises from the coincidence of the early stages of the fruits, which are the mosts susceptible, with a rainy period favourable to the pathogen. Early irrigation leads to the flowering of the coffee trees six to nine weeks before the rains; therefore, the stages of susceptibility of the fruits are located during the dry period and escape the infection. Early irrigation stimulates the growth of the tree and the sporulation of the two Hemileia (Hemileia vastatrix and H. coffeicola) pathogens of the leaf rusts" as soon as the rains begin, a very heavy infection leads to attack levels much higher than under natural conditions. Nevetheless, the early irrigation induces, before these intense attacks of the rusts, the formation of a leaf canopy which is twice on thrice more important than under natural conditions. This important canopy, which is safe from attacks during the dry period, has an intense photosynthetic activity, Yet, the rust attacks are so strong that this benefic effect seems finaly completely annihilated. Therefore, the early irrigation, which suppresses five or seven treatments against the coffee berry disease, does not avoid the use of fungicides; three treatments against the rusts remain necessary. By multiplying by two or three the foliar flushes, the early irrigation multiplies accordingly the number of nodes on which flowers are to form: this modern method of control of the coffee berry disease, integrated to agricultural techniques, is a way to ensure high level regular production

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