چكيده لاتين :
In this study, Talaromyces flavus, a fungal antagonist, was isolated from soil samples that were
collected from cotton fields in Golestan province of Iran. Antagonistic effects of non-volatile extracts of
T. flavus isolates on Verticillium dahliae growth were investigated separately in laboratory experiments.
Different isolates of T.flavus caused variable percents of growth inhibition of V. dahliae. Among isolates, ten
of them that caused more growth inhibition of V. dahliae than other isolates, were selected for greenhouse
experiments. In this step, first inoculum of microsclerotia of V. dahliae and seed treatments affected by nonvolatile
extracts and ascospores suspension of ten isolates of T. flavus were prepared. For comparison of
infection index in seed treatment, greenhouse experiment was performed as a completely randomized design
with forty-three treatments and three replications. Results of disease evaluation showed that among seed
treatments affected by ascospores suspension of T. flavus isolates, seed treatments of isolates TF-2, Tf-12 and
TF-17 caused maximum decrease in Verticillium wilt index. However, among seed treatments affected by nonvolatile
extracts of T.flavus isolates, seed treatments of isolates TF-I, TF-17 and TF-13 resulted in maximum
decrease in disease index.
