Abstract
The two-spotted spider mite [Tetranychus urticae Koch (Acarina: Tetranychidae)] is a very serious pest worldwide, causing considerable damage to vegetables, flowers and fruit crops. Control is difficult mainly due to mite resistance to conventional acaricides. The application of plant extracts to control insects can be an effective alternative. In this study, the efficacy of extract obtained from Leptospermum petersonii Bailey (Myrtaceae) was tested as an alternative to conventional acaricides. Using two different methods, bioassays were used to determine the effects of varying concentrations (0.1, 0.3, 0.4 and 0.5%) of the extracts. Experiments were carried out using 3cm diameter leaf disks of Phaseolus vulgaris L. In addition, the effects of the extracts on mite reproduction and oviposition were investigated. In the leaf dipping method, the extract at 0.5% concentration caused the highest mortality in the nymph (100%) and adult (100%) stages. In the lowest concentration bioassays, the adult mites laid lower numbers of eggs compared to the untreated control. The highest effect occurred at a concentration of 0.5% while the lowest effect was at 0.1%. No ovicidal effects of the plant extracts were observed.
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Claims 5
Claim · model-written summary
The 0.5% extract caused the highest mortality of nymphal mites (100%) in leaf dipping.
- Taxon
- Phaseolus vulgaris
Phaseolus vulgarise2 - Organ / stage
- nymphe3
- Treatment
- the extract at 0.5% concentratione3
- Interactor
- Tetranychus urticae Koch
.jpg?width=60)
Tetranychus urticaee0pest - Outcome
- mortalitye3
- Direction
- higheste3
- Value
- 100%e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Tetranychus urticae Koch (Acarina: Tetranychidae)”
e2“Experiments were carried out using 3cm diameter leaf disks of Phaseolus vulgaris L.”
e3“In the leaf dipping method, the extract at 0.5% concentration caused the highest mortality in the nymph (100%) and adult (100%) stages”
Claim · model-written summary
The 0.5% extract caused the highest mortality of adult mites (100%) in leaf dipping.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise2
- Organ / stage
- adulte3
- Treatment
- the extract at 0.5% concentratione3
- Interactor
- Tetranychus urticae KochTetranychus urticaee0pest
- Outcome
- mortalitye3
- Direction
- higheste3
- Value
- 100%e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tetranychus urticae Koch (Acarina: Tetranychidae)”
e2“Experiments were carried out using 3cm diameter leaf disks of Phaseolus vulgaris L.”
e3“In the leaf dipping method, the extract at 0.5% concentration caused the highest mortality in the nymph (100%) and adult (100%) stages”
Claim · model-written summary
At the lowest concentration, adult mites laid fewer eggs than on the untreated control.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise2
- Organ / stage
- adulte4
- Treatment
- lowest concentratione4
- Interactor
- adult mitese4pest
- Outcome
- numbers of eggse4
- Direction
- lowere4
- Comparator
- untreated controle4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Experiments were carried out using 3cm diameter leaf disks of Phaseolus vulgaris L.”
e4“In the lowest concentration bioassays, the adult mites laid lower numbers of eggs compared to the untreated control”
Claim · model-written summary
The 0.5% concentration had the highest effect and the 0.1% concentration the lowest effect.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise2
- Treatment
- a concentration of 0.5%e5
- Outcome
- effecte5
- Direction
- higheste5
- Comparator
- 0.1%e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Experiments were carried out using 3cm diameter leaf disks of Phaseolus vulgaris L.”
e5“The highest effect occurred at a concentration of 0.5% while the lowest effect was at 0.1%”
Claim · model-written summary
The plant extracts had no ovicidal effect.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise2
- Treatment
- plant extractse6
- Outcome
- ovicidal effectse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Experiments were carried out using 3cm diameter leaf disks of Phaseolus vulgaris L.”
e6“No ovicidal effects of the plant extracts were observed”
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
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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.