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VOL. 5, ISSUE 4 (2023)
Contact, fumigant and repellency effects of some essential oils against the two spotted spider mite Tetranychus urticae koch, and the cotton aphid Aphis gossypii glover
Authors
Heba M Nasr, Noura F Abou-elenien, Hala E Moafi
Abstract
The contact, fumigant toxicities and
repellency effect of three plant essential oils were evaluated against the two
spotted spider mite, Tetranychus urticae Koch and cotton aphid Aphis
gossypii Glover. Five concentrations were used for each essential oil and
mortality present was measured after 6, 24 and 48 hours.LC50 and LC90 values
were calculated. The LC50 effect on the hydrolase- enzymes (ACP & ALP) was
detected. The obtained data declared that Marjoram oil was more effective
against T. urticae than other essential oils causing 100% mortality at
15000 ppm, while, Chamomile oil was more effective against Aphis gossypii
causing 96.7% mortality at the same concentration. The vapor phase effect of
Marjoram oil revealed a remarkable activity (96.67% & 83.3%) adult
mortality for both T. urticae and Aphis gossypii respectively.
The repellency effect of the three essential oils was observed. Thyme oil was
proven to be a strong repellent for T. urticae, wear as, Chamomile oil
for Aphis gossypii. The optained data for the activity of (ACP&ALP)
levels showing increasing in ALP levels for treated T. urticae, while
that level decreased for treated Aphis gossypii. Finally, we can
conclude that Marjoram oil and Chamomile oil both had high acaricidal and
insecticidal activity.
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Pages:3-6
How to cite this article:
Heba M Nasr, Noura F Abou-elenien, Hala E Moafi "Contact, fumigant and repellency effects of some essential oils against the two spotted spider mite <i>Tetranychus urticae</i> koch, and the cotton aphid <i>Aphis gossypii </i>glover". International Journal of Agriculture and Plant Science, Vol 5, Issue 4, 2023, Pages 3-6
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