A. M. KORAYEM AND SUSAN A. HASABO
Plant Pathology Department, National Research Center , Dokki, Cairo , Egypt

ABSTRACT

Activity of Helicotylenchus dihystera, Meloidogym incognita, Rolylenchulus renformis and Tylenchulus semipenetrans exposed to standard solution from bulb extract of both Allium cepa and A. sativum, shoot extract of Chenopodium album, C. ambrosloides and Seneclo aegyptius was reduced by 100% after 14 hrs exposure. Also, a 100% reduction in activity of all tested nematode species was obtained by 1:1 dilution from shoot extract of C. ambrosioides after 24 hrs exposure. A complete reduction in the tested nematode activity was not obtained at any exposure period and any concentration from Melia azedarach extract.
Activity of nematodes exposed to the standard concentration of shoot extracts from C. album, C. ambrosioides and S. aegyptius was not recovered when nematodes were transferred to water for 48 hrs. Activity of tested nematodes exposed to 1:1 dilutions of all tested extracts recovered by approximately 100% when nematodes were transferred to water. A complete inhibition in hatching (100%) was obtained with the standard solution from all tested plant extracts except of seed extract of M azedarach.

Key Words: Plant extracts, Plant-parasitic nematodes.