Abstract
Plant disease associated fungi are of concern to plant pathologists, plant breeders, post harvest disease experts, quarantine officials and farmers in Thailand. Checklists with sound morphological identification are paramount to work by these specialists. In recent years molecular techniques have been applied to species identification and many species have been shown to comprise numerous cryptic species. In this paper, the need for modern systematic treatments of several important phytopathogenic genera are highlighted and a recommendation for future research of plant pathogens in Thailand is discussed.