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

Abstract

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.