Abstract:

Passiflora edulis is highly susceptible to anthracnose during cultivation, and preventing the outbreak of this disease has become an urgent problem to be solved in its planting process. Six kinds of Chinese herbal extracts were prepared following standard methods. The inhibitory effects of these extracts on the mycelial growth of Colletotrichum gloeosporioides (the pathogen of passion fruit anthracnose) were detected by plate culture method at different concentrations (10, 20, 30, 40, 50 mg/mL). The results showed that at a concentration of 10 mg/mL, clove extract exhibited the strongest inhibitory effect on C. gloeosporioides, with an inhibition rate of 100%, followed by the extracts of Ligusticum chuanxiong, Angelica sinensis, Alpinia officinarum and Scutellaria baicalensis, while the inhibition rate of Stemona sessilifolia extract was only 30%. When the concentration reached 50 mg/mL, both clove and Angelica sinensis extracts achieved an inhibition rate of 100%; the inhibition rates of Ligusticum chuanxiong and Alpinia officinarum extracts exceeded 90%, and those of Scutellaria baicalensis and Stemona sessilifolia extracts were 84.43% and 78.10%, respectively. The six Chinese herbal extracts showed varying inhibitory effects on C. gloeosporioides, among which clove extract had the most significant performance, maintaining a 100% inhibition rate at concentrations of 10, 20, 30, 40 and 50 mg/mL, thus having great potential for the development of pesticides for the control of major diseases in P. edulis.

Key words: Passiflora edulis, Colletotrichum gloeosporioides, Chinese herbal extracts, inhibitory effect, green prevention and control