A study on fungicidal activity of allicin against Colletotrichum capsici and Phytophthora capsici in the laboratory and its efficacy in the field

doi:10.11686/cyxb20140331

Abstract

Abstract: Allicin is a botanical antibiotic extracted from garlic. To explore fungicidal activity of allicin against Colletotrichum capsici and Phytophthora capsici in the laboratory its inhibitory effects against mycelial growth and conidial production were assayed by measuring mycelial growth rate and conidial germination. Its efficacy in the field was tested by foliar spraying. Allicin showed inhibitory effects against mycelia growth, conidial production and germination of both fungi and its activity increased with increased concentrations. The EC₅₀ was 130.15, 142.60 and 127.21 μg/mL against mycelial growth, conidial production and conidial germination respectively of C. capsici, and 128.11, 123.64 and 139.68 μg/mL respectively against P. capsici. Field tests showed that the efficacies of allicin 6% EW (emulsion in water) at 600 and at 1200 μg/mL against C. capsici were 83.54%-88.25% respectively and 82.85%-85.88% against P. capsici. On the third day after the third spray they were 74.59%-79.16% and 74.59%-78.01% respectively but at the fourteenth day after the third spray, they were not significantly different from that of the control [carbendazim 50% WP (wettalbe powders) at 1000 μg/mL]. The efficacies of allicin 6% EW at 200-600 μg/mL against C. capsici and P. capsici were less than 76% on the third to fourteenth day after the third spray, and were significantly lower than that of the control. The recommended dosage of allicin 6% EW against C. capsici and P. capsici is 600-1200 μg/mL on pepper seedlings and during the fruiting period, spraying was done 3 times at 10 d intervals.

CLC Number:

S436.418

ZHOU Qing,LI Bao-tong,TANG Li-mei. A study on fungicidal activity of allicin against Colletotrichum capsici and Phytophthora capsici in the laboratory and its efficacy in the field[J]. Acta Prataculturae Sinica, 2014, 23(3): 262-268.

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