Density and spatial distribution pattern of current emergence holes of the teak beehole borer, Xyleutes ceramicus in Northern Thailand
1994
Maeto, Kaoru | Supachote Eungwijarnpanya (Forestry and Foresst Products Research Insst. Hokkaido Research Center,Sapporo (Japan))
Density and spatial distribution pattern of current emergence holes of the teak beehole borer, Xyleutes ceramicus, were studied in man-made stands of teak. There was no significant correlation between tree age and the number of emergence holes per tree. The results of m-m regression analysis indicated that emergence holes are distributed per tree with a strong tendency for aggregation. The estimated values of alpha (index of basic contagion) and beta (density-contagiousness coefficient) for current emergence holes per tree were 0.3 and 2.5, respectively. The susceptibility of individual trees to the teak beehole borer seemed to be retained for years. During the survey period of four years, the mean number of current emergence holes per tree fluctuated more than five-fold in two plots, whereas it was firmly stabilized in other two plots. The mean number of current emergence holes fluctuated in the range of 0.3 to 6 per tree.
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