Laboratoryand Semi Field Evaluation of Garlic Aqueous Extract as Acaricide Against Two Tetranychid mites (Acari: Tetranychidae)
Abstract: The two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), and the carmine spider mite, Tetranychus cinnabarinus, are two of the most important pest mites of different host plants in Egypt. These mites are spreading rapidly because of their resistance to acaricides; therefore it was necessary to develop a new biological control tactics for population management. Plant extracts, such as garlic extract (Allium sativum Linn.), may represent easy, available and viable alternatives, because they are considered to be minimum-risk pesticides. In this study, we conducted a series of laboratory and semi-field experiments to determine the susceptibility of adult females to different concentrations of garlic aqueous extract (G.A.E.).Mortality was measured upon treatment with five(G.A.E.) concentrations ranging from 1 to 25% W/V. Female mortality increased with concentration, T. urticae was more tolerant than T. cinnabarinus through laboratory studies as maximum mortality values were 90 and 100% after 24 hours using concentration 25% W/V, respectively. The chemical composition of the Allium sativum aqueous extract was characterized by GC/MS analysis which revealed the occurrence of 33 compounds, the major compound was identified as 2-Furancarboxaldehyde, 5-(hydroxymethyl). The efficacy of (G.A.E.) was evaluated against T. urticae and T. cinnabarinusunder semi-field conditions. Highest reduction (89.75 %)in T. urticae population was recorded using concentration 50%W/V 1 day after treatment (DAT). T. cinnabarinuswas more tolerant under the semi-field conditions as the reduction was (80.14 %) using the same concentration. Results showed that (G.A.E.) are effective in the control of both tetranychids. They are promising candidates for biological control of these two pests.
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Publication year 2016
Pages 623– 628
Organization Name
Author(s) from ARC
Publication Type Journal
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