Aphids cause significant damage tp crops, particularly citrus. To combat these pests, farmers typically use synthetic pesticides, yet these pesticides leave negative impacts on the environment. In an effort to find new efficient forms of control against aphids, especially Aphis citricola, without causing damage to the environment, we evaluated the toxicity of essential oil from the leafy twigs of Tetraclinis articulata and Juniperus phoenicea. Essential oil extraction was performed by steam distillation, and chemical composition was analyzed by gas chromatography–mass spectrometry (GC–MS). Thirty-six components were identified in the essential oil from T. articulata. Isobornyl acetate (58.32 %), α-pinene (9.31 %), and camphor (9.23 %) are the main components of this oil. For J. phoenicea, forty-seven compounds were identified; α-pinene was the major compound at 48.18 %, followed by δ-cadinene (6.61 %). Each of the essential oils we tested showed some degree of toxicity against A. citricola. This toxicity is amplified with concentration and time, and varies between plant species. Ultimately, the essential oil extracted from J. phoenicea’s leafy twigs was the most toxic (54.03 μL/L after 24 h) against A. citricola; its compounds may therefore be considered as new biodegradable agents to control aphids and viable for use in an integrated pest management program.
Research on Chemical Intermediates – Springer Journals
Published: Mar 28, 2016
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