A study of the nematicidal activity of allicin—an active principle in garlic,Allium sativumL., against root‐knot nematode,Meloidogyne incognita(Kofoid and White, 1919) Chitwood, 1949

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Abstract
Allicin—an active nematicidal principle in garlic—has been isolated and tested against Meloidogyne incognita infesting tomato. Allicin resulted in 11–75 eggs hatched at 5–0.5 ppm compared with 146 hatched at 0 ppm after 120 h. A juvenile kill of 87–100% at 2.5–5.0 ppm allicin was recorded within 72 h. Concentrations of 200 and 100 ppm allicin as bare‐root dips for 30 min killed 83% and 87% of tomato seedlings, respectively. Penetration of tomato roots by juveniles was 13%, 14% and 18% in seedlings which had been dipped in allicin at 200, 100 and 25 ppm for 5 min, respectively, compared with 36% in untreated seedlings. Allicin at 25 ppm for 5 min as a root‐dip treatment for tomato seedlings is effective against M. incognita.

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