A greenhouse experiment was conducted to evaluate the efficacy of soil
amendment with six botanical leaves powders and poultry manure in controlling
Meloidogyne incognita infecting tomato and their potency in growth improvement.
The result of the study showed that all the treatments significantly (p<0.05) reduced
root galling, second-stage juveniles in soil, developmental stages and egg masses
and reductions differed according to the amended materials. Although all treatments
were effective in reducing root galls and nematode population, soil treated with
leaves powder of Peganum harmala gave the highest reduction in nematode criteria
followed by Datura stramonium and Nicotiana glauca, However, Azadirachta indica
had the least reduction compared to the untreated check. The efficacy increased
with the increase in dosage rates except with poultry manure at the highest dosage.
Most soil amendments at different dosage rates significantly improved the shoot
and root weights. Peganum harmala achieved the highest increase, while
Azadirachta indica gave the lowest one.