Such results indicate that these plant extracts may have fungicidal properties that can be used as seed treatments
for controlling P. grisea, the causal agent of rice blast.
The antifungal properties of Z. officinalis on Aspergilus flavus, Aspergilus niger, Fusarium solani and Fusarium oxysporum on post-harvest yam (Dioscorea alata, Poir) has been reported by Yeni [35]. Other researchers also reported that Z. officinalis has been used for relief from arthritis, rheumatism, coughs, fever and infectious diseases.
The highest mycelial growth of P. grisea was favored by 5% B. pilosa (–10.92%) and 1% (–1.57%) (Table 2).
The effect of N. tabacum on P. grisea at 1%, 5% and 10% levels showed subsequent increase in percentage of fungal growth inhibition and decrease at 25% (Table 2).
These results suggest that the optimal concentration of N. tabacum leaf extracts was around 10%.