Abstract
Thirty-four essential oils were screened for their repellent activities against the twospotted spider mite, Tetranychus urticae Koch (Acarina: Tetranychidae), at 0.1% concentration level using choice and no-choice laboratory bioassays. Of these, 20 essential oils showed significant repellencies against T. urticae in the choice tests. In subsequent no-choice tests using these 20 essential oils, only sandalwood oil showed significant repellency against T. urticae. Total number of eggs oviposited by T. urticae was significantly lower than controls in the choice tests when the kidney bean leaves were treated with 1 of 14 essential oils. The significant repellency of sandalwood oil against T. urticae lasted at least for 5 h at the 0.1% concentration level. Our GC-MS analysis indicated that the major components of the sandalwood oil were alpha-santalol (45.8%), beta-santalol (20.6%), beta-sinensal (9.4%), and epi-beta-santalol (3.3%). Santanol, a mixture of the two main components in the sandalwood oil, appears to be responsible for the repellency of sandalwood oil against T. urticae.
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Claims 4
Claim · model-written summary
Twenty of 34 oils significantly repelled T. urticae in choice tests.
- Taxon
- kidney bean
Phaseolus vulgarist0 - Interactor
- T. urticae
.jpg?width=60)
Tetranychus urticaee0pest - Outcome
- repellencies against T. urticaee0
- Value
- 20 essential oilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Of these, 20 essential oils showed significant repellencies against T. urticae in the choice tests”
t0“when the kidney bean leaves were treated”
Claim · model-written summary
Only sandalwood oil significantly repelled T. urticae in no-choice tests.
- Taxon
- kidney beanPhaseolus vulgarist0
- Treatment
- sandalwood oile0
- Interactor
- T. urticaeTetranychus urticaee0pest
- Outcome
- repellency against T. urticaee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only sandalwood oil showed significant repellency against T. urticae”
t0“when the kidney bean leaves were treated”
Claim · model-written summary
Fourteen oils applied to kidney bean leaves significantly reduced T. urticae egg laying versus controls.
- Taxon
- kidney beanPhaseolus vulgarise0
- Treatment
- 1 of 14 essential oilse0
- Interactor
- T. urticaeTetranychus urticaee0pest
- Outcome
- eggs oviposited by T. urticaee0
- Direction
- lowere0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total number of eggs oviposited by T. urticae was significantly lower than controls in the choice tests when the kidney bean leaves were treated with 1 of 14 essential oils”
Claim · model-written summary
Sandalwood oil significantly repelled T. urticae for at least 5 h at 0.1%.
- Taxon
- kidney beanPhaseolus vulgarist0
- Treatment
- sandalwood oile0
- Interactor
- T. urticaeTetranychus urticaee0pest
- Outcome
- repellency of sandalwood oil against T. urticaee0
- Value
- 5 he0
- Qualifier
- 0.1% concentration levele0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The significant repellency of sandalwood oil against T. urticae lasted at least for 5 h at the 0.1% concentration level”
t0“when the kidney bean leaves were treated”
The same questions in other papers
botanical · Tetranychus urticae · Phaseolus vulgaris (common bean)Positive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
4 papers more in this group
See all 8 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.