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Marigold (Tagetes) and garlic act as antagonists to root knot nematodes. Are they effective?

Question: Marigold (Tagetes) and garlic act as antagonists to root knot nematodes. Are they effective?

Options:

both marigold and garlic are effective in controlling root knot nematodes.
marigold and garlic have no effect on root knot nematodes.
Marigold is effective, but garlic is not.
Garlic is effective, but marigold is not.

✅Explanation:

• Marigold (Tagetes) and garlic (Allium sativum) can both act as antagonists to root knot nematodes, but their effectiveness can vary. Here's a breakdown:
Marigold (Tagetes): Particularly Tagetes patula species have been well-studied for their nematologicidal properties. These marigolds release thiophene compounds that disrupt nematode development and egg-hatching. Studies have shown a reduction in root knot nematode populations when marigolds are grown as a cover crop or intercropped with susceptible plants.
Garlic (Allium sativum): Garlic contains compounds like allicin which exhibit some nematicidal properties, meaning they can kill nematodes. However, the effectiveness of garlic in controlling root knot nematodes in agricultural settings is less established compared to marigolds. More research is needed to determine optimal application methods for garlic to achieve consistent results.

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