Screening for inhibitory activities of essential oils on the growth of Colletotrichum gloeosporioides (Penz.) Penz. Sacc., the causal agent of leaf spot disease of Murraya koenigii L.

摘要

Seven essential oils namely clove, cedar wood, lemongrass, peppermint, eucalyptus, citronella, and neem oils were tested for their inhibitory effect on spore germination, growth of germ tube and mycelial growth of Colletotrichum gloeosporioides isolated from diseased Murraya koenigii. All essential oils inhibited the germination and growth of germ tube at different concns. However, significant redn. in colony growth was obsd. with citrus, lemongrass, and peppermint oils at 1000, 1500, and 2000 ppm concns., resp. Citrus oil at 1360 ppm inhibited the max. growth of the fungus followed by lemongrass oil at 1720 ppm and peppermint at 2260 ppm, resp. The effect of essential oils on mycelial dry wt. also showed antifungal activity on the growth of Colletotrichum gloeosporioides. The study revealed the possible utilization of these essential oils for foliar spray for the management of leaf spot disease of M. koenigii. [on SciFinder(R)]