Disease Classes Range Severity of infection 0 0 Healthy plants 1 25 > Initial development of pinheads of Ganoderma spp. 2 26-50 Appearance of Ganoderma on the tree trunk but no remarkable damage observed in plants. 3 50-75 Partially top dying 4 >75 Fully top dying of plants and plants dried.

Formula used to calculate disease severity index (DSI) % = Σ (A × B) × 100/ ΣB × 4 where: A – Disease classes (0, 1, 2, 3, 4 and so on) B – Number of plants showing that disease classes per treatment

Table 1: Parameters used to calculate disease severity in the study area.