A greenhouse experiment was conducted to evaluate effect of some soil
amendments, i.e; fresh chopped leaves or dry leaves powder of Datura stramonium,
Peganum harmala or Tagetes minuta, poultry and sheep manure in controlling the
stem and bulb nematode, Ditylenchus dipsaci on garlic (Allium sativum) as
compared to the nematicide, Vydate® (Oxamyl). All applied treatments significantly
(P≤ 0.05) reduced final population of D. dipsaci except in treatment of sheep
manure at lowest dosage rate, which significantly increased the population in
comparison to that of the check. Efficacy of the treatments differed according to the
type of organic soil amendment, dosage rate and type of application. Dry leaves
powder of Peganum harmala was the most effective in reducing nematode counts in
soil and garlic bulbs at the different rates, followed by fresh chopped leaves of
Datura stramonium and T. minuta while, the lowest % reduction in such nematode
parameters was recorded in case of soil amended with sheep manure followed by
dry leaves powder of Datura stramonium. As for plant growth criteria the results
reveal that most tested materials improved plant growth criteria of shoot, root and
bulb compared to the untreated controls.