Questions, issues being addressed? * Verticillium wilt issues that NSW DPI Pathology in the project Diseases of Cotton XI have been and are continuing to look at. * Quantify the propagules of Verticillium in different field's soil. * Quantify the relationship between Verticillium inoculum and symptoms. * To find what the relationship between Verticillium and (soil/water) pH is. * To see the effect of different water sources (bore water compared to river water) on Verticillium wilt. * To see the effect of different irrigation systems (furrow compared to lateral irrigation) on Verticillium wilt. * Potential interaction between field levels of black root rot and Verticillium wilt. * Collection of reference cultures to determine VCG's present.