| Journal: |
life
https://www.mdpi.com/
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Volume: |
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| Abstract: |
The two spotted spider mite (TSSM), Tetranychus urticae Koch, is a cosmopolitan mite. It
rapidly reproduces and can develop resistance to chemical pesticides. This study aims to evaluate
the toxicity and acaricidal activity of three essential oils from basil, clove, and peppermint against
T. urticae reproduction, which is grown on three cucumber cultivars, Chief (SC 4145), Raian (CB898),
and Toshka (SC 349), under laboratory conditions at 27 + 3 ◦C and 70 + 5% RH. GC-MS characterized
the volatile oils of basil, clove, and peppermint. Methyl cinnamate, eugenol, and menthol were the
main essential oils in basil, clove, and peppermint, respectively. The results indicated significant
differences in the duration of development between T. urticae feeding on the three cucumber cultivars
(p ≤ 0.05), including eggs, protonymph, and deutonymph time. The Toshka (SC 349) cultivar recorded
the lowest developmental time. The longevity period exhibited the same trend with non-significant
differences between Raian (CB898) and Toshka (SC 349). Moreover, the lethal concentration (LC50)
and LC90 values in tested essential oils (EOs) showed that clove EOs were the most toxic. In contrast,
basil and peppermint EOs were the least effective, and immature stages were more sensitive to EOs
than adult stages. The infected Toshka (SC 349) discs treated with essential oils and abamectin under
in vitro conditions indicated that clove oil is comparable to abamectin regarding its effect on the
egg numbers (18.7 and 17.6 egg), immature development time, longevity, life span, and life cycle
(20.6 and 20.8 days) of T. urticae. We conclude that the resistant cultivation of cucumber plants can be recommended in integrated pest management programs. The most effective of the tested oils, clove
EOs, should be used as alternatives to pesticides to control T. urticae in the protected cultivation of
cucumbers.
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