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- Title
Nematostatic effects of a leaf extract from Crotalaria virgulata subsp. grantiana on Meloidogyne incognita and its use to protect tomato roots.
- Authors
Jourand, Philippe; Rapior, Sylvie; Fargette, Mireille; Mateille, Thierry
- 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.
- Subjects
PLANT nematodes; SOUTHERN root-knot nematode; TOMATO diseases &; pests; PLANT protection; PLANT extracts; ROOT-knot
- Publication
Nematology, 2004, Vol 6, Issue 1, p79
- ISSN
1388-5545
- Publication type
Article
- DOI
10.1163/156854104323072955