Sterilized and nonsterilized soils were inoculated with the
phytopathogens Fusarium and (or) Pseudomonas, and the
antagonistic Streptomyces spp. and herbicide-treated or
untreated tomato seedlings were transplanted to these soils.
The results (Table 3) showed a significant (P 5 0.01)
decrease of wilt incidence as well as the percentage of colonization
of the two pathogens to the stem segments, compared
with the infested control plants. The decrease was more significant
(P 5 0.01) in nonsterilized soil than in sterilized soil
samples (data not shown). Disease incidence (wilt symptoms)
and colonization of stem segments by Fusarium or
Pseudomonas were more reduced in plants grown from
herbicide-treated seeds and sown in nonsterilized than in
sterilized soil. The reduction became more significant
(P 5 0.01) by increasing the concentration of metribuzin or
pendimethalin, and the latter was more effective. No wilt