ABSTRACT 

Aqueous crude extracts of ginger, neem seeds, paw paw roots, bitter cola and leaves of J-Jyptls suaveolens at 5%, 10% and 20% concentration were tested 1'or their effects on the mycelial growth and scicrotial germination of Scieroiiiw, rol,R1i on potato dextrose agar (PDA). The experiment was laid out in a 5 x 3 factorial in a completely randomized design (CRD) replicated three times. The results showed that at 20% concentration, extracts ol' nccm seed, IL s:iavcole,is, bitter cola and ginger significantly (P< 0.05) inhibited the inycelial growth of . ro1/.ii better than the extract of paw paw roots. Percentage inhibition was 71.1%, 64.6%, 62.6%. 59.3% and 36.6% respectively. Percentage scicrotia inhibitions at 20% concentration of the extracts were: neem seed (82.7%),I-I.suaveolens (82.7%), bitter cola (80.7%), ginger (70.2%) and pawpaw (49.0%). At 10% and 5% concentrations, the rnycclial growth and scerotia germination of S. roI/ii was poorly inhibited. Inhibition of mycelial growth and germination of selerotia in S. rolJ.ii increased with increasing concentration of the extracts. in the grecnhous.' studies potted soil in which tomato seeds were sown, was drenched with efficacious extracts at 20% concentration as well as suspension of captan and T i,arziw,u,n. The results showed that drenching two days before inoculation with S. rolfsll gave similar disease reduction (56-67%) in all treatments. When the soil drenches were applied on the same day as inoculation, T. Izarzianu,n, ncen'i seed extracts, captan, H. suaveolens and ginger extracts significantly differed (P <0.05) from the bitter cola extract and the disease reduction value range from 40% -60%. Only nccm seed extract, captan and T harzianum significantly (P <0.05) reduced the damping-off disease giving disease reduction values of 52.5%, 57.5% and 64.7% respectively, at two days after inoculation with the fungus.