Abstract
Abstract An aqueous extract from leaves of Crotalaria virgulata subsp. grantiana was assayed for its effects on second-stage juveniles of Meloidogyne incognita. The biological activity was nematostatic; nematodes were not killed but were completely paralysed in a 1 mg/ml (w/v) extract: the LD50 equivalent was estimated to be 0.5 mg/ml. The effect was reversible: juveniles previously paralysed by C. grantiana extract recovered complete mobility in water and were able to infest a susceptible tomato plant. Freeze-dried aqueous extract from C. grantiana leaves added to a sterile sandy substrate at 1 mg/ml protected susceptible tomato plants from M. incognita infestation. This suggests a promising use of C. grantiana as both a green manure and natural alternative to synthetic chemicals in nematode population control, especially in integrated pest management for vegetable crops in organic agriculture of tropical and temperate areas.
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Claims 5
Claim · model-written summary
A 1 mg/ml (w/v) aqueous extract of Crotalaria grantiana leaves completely paralysed second-stage juveniles of Meloidogyne incognita without killing them.
- Taxon
- Meloidogyne incognita
_penetrates_a_tomato_root_-_USDA-ARS.jpg?width=60)
Meloidogyne incognitae0 - Treatment
- 1 mg/ml (w/v) extracte1
- Interactor
- Meloidogyne incognitaMeloidogyne incognitae0pest
- Outcome
- completely paralysede1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_penetrates_a_tomato_root_-_USDA-ARS.jpg?width=500)
Verbatim
e0“second-stage juveniles of Meloidogyne incognita”
e1“nematodes were not killed but were completely paralysed in a 1 mg/ml (w/v) extract”
Claim · model-written summary
The LD50 equivalent of the extract for Meloidogyne incognita juveniles was estimated at 0.5 mg/ml.
- Taxon
- Meloidogyne incognitaMeloidogyne incognitae0
- Interactor
- Meloidogyne incognitaMeloidogyne incognitae0pest
- Outcome
- LD50 equivalente1
- Value
- 0.5 mg/mle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“second-stage juveniles of Meloidogyne incognita”
e1“the LD50 equivalent was estimated to be 0.5 mg/ml”
Claim · model-written summary
Juveniles paralysed by the extract recovered complete mobility in water and could infest a susceptible tomato plant.
- Taxon
- Meloidogyne incognitaMeloidogyne incognitae0
- Interactor
- Meloidogyne incognitaMeloidogyne incognitae0pest
- Outcome
- recovered complete mobilitye1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“second-stage juveniles of Meloidogyne incognita”
e1“juveniles previously paralysed by C. grantiana extract recovered complete mobility in water and were able to infest a susceptible tomato plant”
Claim · model-written summary
Freeze-dried aqueous extract from C. grantiana leaves added at 1 mg/ml to a sterile sandy substrate protected susceptible tomato plants from M. incognita infestation.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- Freeze-dried aqueous extract from C. grantiana leavese0
- Interactor
- M. incognitaMeloidogyne incognitae0pest
- Outcome
- M. incognita infestatione0
- Direction
- protectede0
- Value
- 1 mg/mle0
- Setting
- sterile sandy substratee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Freeze-dried aqueous extract from C. grantiana leaves added to a sterile sandy substrate at 1 mg/ml protected susceptible tomato plants from M. incognita infestation”
Claim · model-written summary
The authors suggest a promising use of C. grantiana as a green manure and natural alternative to synthetic chemicals for nematode population control.
- Taxon
- C. grantianaCrotalaria virgulata subsp. grantianae0
- Outcome
- nematode population controle0
Verbatim
e0“This suggests a promising use of C. grantiana as both a green manure and natural alternative to synthetic chemicals in nematode population control”
The same questions in other papers
botanical · Meloidogyne incognita · Solanum lycopersicum (tomato)Positive and negative results
114 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
113 papers more in this group
See all 117 papers →cold · Meloidogyne incognita · Solanum lycopersicum (tomato)Results agree
1 paper in the same direction as this paper
- positive
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.