Abstract
Biocide effects of alkaloids, saponins and flavonoids extracted from Capsicum frutescens L. (Solanaceae) on Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae). In an attempt to elaborate a strategy of integrated pest management on vegetable crops in Morocco, insecticidal activities of alkaloids, saponins and flavonoids extracted from Capsicum frutescens L. fruits against eggs and adults of Bemisia tabaci infesting tomato plants, Lycopersicon esculentum Mill. var. Daniella, were carried out under controlled conditions. Alkaloids, saponins and flavonoids, dissolved in ethanol at 1%, were tested at 0, 5, 10 and 20 g.l-1. The three compounds affected egg and adult survival, significantly. The mortality of embryo and adult varied according to the compound considered and for each compound according to concentration and exposure duration. For eggs, the corrected mortality varied from 35 to 59% for alkaloids, 14 to 31% for saponins and 10 to 14% for flavonoids. In adults, the mortalities were spread from 29% to 86%, 14 to 48% and 6 to 29% with alkaloids, saponins and flavonoids, respectively. Significant correlation between egg and adult mortality, due to the compounds tested, were observed. However, eggs required higher concentrations than adults; the LC50 was 13.78 vs. 6.83 g.l-1 for alkaloids, 98.63 vs. 32.28 g.l-1 for saponins and nontoxic vs. 120.65 g.l-1 for the flavonoids. Therefore, alkaloids were shown more effective against B. tabaci than saponins or flavonoids. However, the LT50 estimated for compounds, killing more than 50% of the population studied, was sufficient for viruliferous adults to inoculate TYLCV to plants before they died. The use of these compounds in integrated pest management merit further study.
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Claims 2
Claim · model-written summary
Alkaloids caused 35 to 59% corrected egg mortality.
- Taxon
- tomato plants
Solanum lycopersicume0 - Treatment
- alkaloidse0
- Interactor
- Bemisia tabaci
Bemisia tabacie1pest - Outcome
- corrected mortalitye0
- Direction
- variede0
- Value
- 35 to 59%e0
- Comparator
- 0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato plants, Lycopersicon esculentum Mill. var. Daniella, were carried out under controlled conditions. Alkaloids, saponins and flavonoids, dissolved in ethanol at 1%, were tested at 0, 5, 10 and 20 g.l-1. The three compounds affected egg and adult survival, significantly. The mortality of embryo and adult varied according to the compound considered and for each compound according to concentration and exposure duration. For eggs, the corrected mortality varied from 35 to 59% for alkaloids”
e1“Bemisia tabaci infesting tomato plants”
Claim · model-written summary
Saponins caused 14 to 31% corrected egg mortality.
- Taxon
- Lycopersicon esculentum Mill.Solanum lycopersicume1
- Treatment
- saponinse0
- Outcome
- corrected mortalitye0
- Direction
- variede0
- Value
- 14 to 31%e0
Not reportedInteractorComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For eggs, the corrected mortality varied from 35 to 59% for alkaloids, 14 to 31% for saponins”
e1“tomato plants, Lycopersicon esculentum Mill. var. Daniella”