Isolation and Identification of Dominant Pathogens of Postharvest Kantoseika Strawberry in Tai'an and Evaluation of Antifungal Effects of Essential Oil

doi:10.16409/j.cnki.2095-039x.2022.02.001

Abstract

Abstract: To ascertain the dominant pathogens of postharvest strawberry in Tai'an, Shandong Province, and the inhibition effects of different plant essential oil on the pathogens, main pathogens from the rotted Kantoseika strawberry fruit were isolated, purified, and identified by morphology and molecular biology methods, and the inhibition effects of 7 kinds of plant essential oil against above pathogens were evaluated through indoor fumigation toxicity test. The results showed that three pathogens were isolated from strawberry in Tai'an area, and were identified to be Botrytis cinerea, Alternaria alternata and Cladosporium tenuissimum. The inhibitory effects of seven essential oils against three pathogens were different. Thyme essential oil exhibited the highest indoor toxicity against B. cinerea and A. alternata, with EC₅₀ values of 39.998 μL/L and 18.456 μL/L, respectively. Lemon grass essential oil showed the highest activity against C. tenuissimum, with the EC₅₀ value of 30.523 μL/L. In vivo control effect test showed that, at the concentration of 100 μL/L, thyme essential oil had exhibited the highest effect on B. cinerea and A. alternata, with the efficacies of 86.21% and 89.29%, respectively. The control efficacy of lemon grass essential oil on C. tenuissimum was the highest of 75.86%. By comprehensive comparison, thyme essential oil, pingmarosa essential oil, lemon grass essential oil and cinnamon essential oil all showed excellent inhibitory effects on the three strawberry postharvest pathogens.

Key words: strawberry, postharvest, pathogen, isolation and identification, essential oil

CLC Number:

S476

JIANG Lili, SUN Shoumin, ZONG Xiaojuan, SUN Ruihong, WANG Xiaofang, WU Chong. Isolation and Identification of Dominant Pathogens of Postharvest Kantoseika Strawberry in Tai'an and Evaluation of Antifungal Effects of Essential Oil[J]. Chinese Journal of Biological Control, 2022, 38(1): 275-282.

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