ABSTRACTUMO
The genus Khaya includes important forest species, whose wood is used mainly in the furniture industry and civil construction. Khaya senegalensis is one of the most cultivated species in Brazil. Ceratocystis wilt is one of the main diseases of this culture, offering a serious risk if not properly managed. However, no epidemiological studies have been conducted involving this pathology in K. senegalensis. The objective of this work was to characterize the spread of Ceratocystis wilt in K. senegalensis, using the Dynamics and Foci Structure Analysis technique (DFSA) and the Dispersion Index (DI). Three plots with 540 individuals each were installed inside a plantation of this species. The quantification of the disease was done annually from 2016 to 2018, with the elaboration of dispersion maps of diseased plants, which served as the basis for all the analyzes performed. According to DFSA, the aggregate pattern was observed in all plots and years evaluated, with disease foci showing isodiametric growth. However, using the ID technique, the pattern varied between random and aggregate, depending on the size of the quadrat used. Due to the size of the foci observed in the experimental area, the use of larger quadrats in the ID was recommended, which indicated an aggregate pattern in most plots. Thus, it was possible to conclude here was a tendency for the aggregation of diseased plants, with a probable participation of the pruning tool in the process of spreading and/or infection by the causal agent.
Keywords
African mahogany; epidemiology; dissemination
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