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Armillaria on cacao in Sao Tome

by Rishbeth, J.
Publisher: 1980Subject(s): THEOBROMA CACAO | PARASERIANTHES FALCATARIA | INOCULACION | ENFERMEDADES FUNGOSAS | ENFERMEDADES DE LAS PLANTAS | AISLAMIENTO | TECNICAS ANALITICAS | PATOGENICIDAD | CONTROL DE ENFERMEDADES | CULTIVOS TROPICALES | INFECCION | TRINIDAD Y TOBAGO | THEOBROMA CACAO | PARASERIANTHES FALCATARIA | INOCULATION | FUNGAL DISEASES | PLANT DISEASES | ISOLATION | ANALYTICAL METHODS | PATHOGENICITY | DISEASE CONTROL | TROPICAL CROPS | INFECTION | TRINIDAD AND TOBAGO | THEOBROMA CACAO | PARASERIANTHES FALCATARIA | INOCULATION | MALADIE FONGIQUE | MALADIE DES PLANTES | ISOLEMENT | TECHNIQUE ANALYTIQUE | POUVOIR PATHOGENE | CONTROLE DE MALADIES | PLANTE DE CULTURE TROPICALE | INFECTION | TRINITE-ET-TOBAGO | ARMILLARIA | ROOT DISEASES | FUNGI ATTACK | SUSCEPTIBILITY | SPREAD RATE | SOIL CONDITIONSOnline Resources: En In: Tropical Agriculture (Trinidad y Tobago) v. 57(2) p. 155-165Summary: Outbreaks of root disease caused by Armillaria generally originated from infection of shade trees, some species of which were very susceptible. Serious attacks often developed after shade trees had been felled or otherwise killed, even if they were resistant to Armillaria whilst living. The fungus spread rapidly, up to 5 m/year, in cacao growing in areas of high rainfall. Mortality had reached nine per cent locally, but was usually much lowerSummary: considerable financial loss often resulted. The absence of rhizomorphus in soil may partly be explained by high soil temperatures and adverse conditions of soil aeration, but other inhibitory effects were probably also involved. Suitably situated trenches generally prevented further spread of the fungus in cacao, but further losses sometimes occurred within trenched areas. Other possible control measures are discussed, and attention is drawn to the possibility of new foci arising through infection by air-borne spores
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Outbreaks of root disease caused by Armillaria generally originated from infection of shade trees, some species of which were very susceptible. Serious attacks often developed after shade trees had been felled or otherwise killed, even if they were resistant to Armillaria whilst living. The fungus spread rapidly, up to 5 m/year, in cacao growing in areas of high rainfall. Mortality had reached nine per cent locally, but was usually much lower

considerable financial loss often resulted. The absence of rhizomorphus in soil may partly be explained by high soil temperatures and adverse conditions of soil aeration, but other inhibitory effects were probably also involved. Suitably situated trenches generally prevented further spread of the fungus in cacao, but further losses sometimes occurred within trenched areas. Other possible control measures are discussed, and attention is drawn to the possibility of new foci arising through infection by air-borne spores

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