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VOL. 6, ISSUE 4 (2021)
Bioactivity of Datura stramonium L. extract against Tetranychus cucurbitacearum and the predatory mite, Phytoseiulus macropilis
Authors
Dalia A Waked
Abstract
The plant extracts are considered an alternative method for pests control. The effect of acetone and water extracts obtained from Datura stramonium plant on Tetranychus cucurbitacearum and its predatory mite, Phytoseiulus macropilis was evaluated. The impact of the extracts was measured using the sprayed leaf disk technique. The effect of two extracts with five concentrations was examined against the eggs and females of T. cucurbitacearum in addition to their side effects on females of predatory mite, P. macropilis. The highest unhatchability % of T. cucurbitacearum eggs were found at 100% concentration as 61.25, 67.5% and 52.5, 56.25% for one day and three days old eggs for acetone and water extracts, respectively. The acaricidal activity of two extracts of D. stramonium was tested against females of mites, T. cucurbitacearum and P. macropilis by spray bioassay. The acetone extract showed stronger acaricidal activity with LC50 value that is 42.82% compared with 55.47% of water extract, for T. cucurbitacearum. Regarding the females of P. macropilis the LC50 values were 93.11 and 98.04% for acetone and water extracts. Both extracts gave poor toxic effect to the predatory mite compared with females of T. cucurbitacearum. Furthermore, extracts proved superiority in repellency to spider mite, T. cucurbitacearum. Rate of repellency was decreased gradually by time elapsed after treatment. T. cucurbitacearum females preferred to settle, deposit eggs and feed on the untreated half of the disc and the majority refused to settle on the treated part especially with the high concentrations. Worthy indicating that both extracts shortened the longevity and decreased fecundity of T. cucurbitacearum females. As a consequence, Datura extracts are regarded to be a safe alternative to mite control.
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Pages:70-76
How to cite this article:
Dalia A Waked "Bioactivity of <em>Datura stramonium</em> L. extract against <em>Tetranychus cucurbitacearum</em> and the predatory mite, <em>Phytoseiulus macropilis</em> ". International Journal of Entomology Research, Vol 6, Issue 4, 2021, Pages 70-76
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