Spatio-temporal distribution of gummosis
Measurement of the nearest distance among symptomatic trees was used as
a variable to assess disease spread given that Ceratocystis and
other disease inducing factors got spread from trees to trees via active
movement of the insect vector or passive movement of the wind. Based on
the number of trees which showed gummosis from a distance of 1 m to
>50 m, it was interpreted that the inoculum was present
within 1 to 5 m distance from the healthy trees. The highest number of
trees with the incidence of gummosis was observed at 5 m but decreased
thereafter without a definite pattern with increasing distance (Fig.
8a). The highest percentage of gummosis incidence also followed the same
pattern (Fig. 8b).