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Allelopathic effects of essential oil from Eucalyptus grandis × E. urophylla on pathogenic fungi and pest insects
Authors:Xiaoxiang Liu  Qiubo Chen  Zhenhui Wang  Longlian Xie  Zhi Xu
Institution:(1) Library of South China University of Tropical Agriculture, Danzhou, 571737, China;(2) Tropical Crops Germplasm Resources Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou, 571737, China;(3) Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou, 571737, China;(4) Sci-Tech Information Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou, 571737, China;(5) Analytical and Testing Centre, Chinese Academy of Tropical Agricultural Sciences, Haikou, 571101, China
Abstract:This study on the allelopathic effects and chemical components of the essential oi l from Eucalyptus grandis × E. urophylla shows that the leaf oil emulsion of E. grandis × E. urophylla can inhibit the proliferation of pathogenic fungi Fusarium oxysporum, Pyriculerie grisea, Glorosprium musa rum and Phytophthora capsici. Pupation and feeding of the pest insects Spodopteralitura Fabricius and Helicoverpa armigera Hubner are shown to be affected with restraining effects which increase with the increasing levels of oil concentration. A GC/MS analysis of the leaf oil indicated that the main components, with a relative content of ⩾3%, were alloocimene (43.22%), α-pinene (13.63%), γ-terpinene (5.49%), (E)-3,7-dimethyl-2,6-octadien-1-ol (3.58%), β-fenchyl alcohol (4.58%), and 2-amino-3,5-dicyano-6-(4-methoxyphenoxy)-pyridine (3.67%). Terpenes played an important role in the inhibitory effects of E. grandis × E. urophylla essential oil on pathogenic fungi and pest insects. Poor biodiversity of eucalyptus plantations is a function of allelopathy. __________ Translated from Chinese Journal of Ecology, 2007, 26(6): 835–839 译自: 生态学杂志]
Keywords:Eucalyptus grandis × E  urophylla            essential oil  allelopathic effect  pathogenic fungi  pest insects
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