Marigolds control nematodes
MetadataShow full item record
CTA. 1988. Marigolds control nematodes. Spore 17. CTA, Wageningen, The Netherlands.
Permanent link to this item: http://hdl.handle.net/10568/44944
African and Mexican marigolds (Tagetes species), common weeds of Africa, can substantially improve plant growth in soil infested with root knot nematodes. Trials in Tanzania have shown that, although not as effective as nematicides, Tagetes have...
African and Mexican marigolds (Tagetes species), common weeds of Africa, can substantially improve plant growth in soil infested with root knot nematodes. Trials in Tanzania have shown that, although not as effective as nematicides, Tagetes have potential for farmers in developing countries where chemicals are often beyond their means. At the Tropical Pesticide Research Institute in Arusha, Tanzania, the effectiveness of the marigolds was tested against two nematicides, Aldicarb and ethylene dibromide, with crops of tomatoes in highly-infested soils. Marigolds were planted beside the tomatoes. The two nematicides reduced the number of nematode root galls by 90-95%, whereas the presence of marigolds reduced infestation by 85%. The plants grown with Aldicarb not only grew better than the other treatments but yielded ten times as much fruit as the control. The tomatoes intercropped with marigolds gave six times the yield of fruit. For some reason, the ethylene dibromide treatment gave the poorest results in terms of plant growth and yield, although it was the most effective treatment for reducing root galling. The researchers feel that marigolds have good potential for overcoming nematode problems with vegetable crops. They can be intercropped easily, require no expertise, cause no toxicity hazards, and could provide a more stable and long-lasting control. For more details, contact: Plant Pathology Section Tropical Pesticide Research Institute Box 3024 Arusha TANZANIA