Disease Surveys. Commercial cotton (Gossypium hirsutum L.) fields in the Mcintyre, Gwydir, Namol and Macquarie valleys of New South Wales were inspected in November and March each season. Commercial fields in the Bourke area were also inspected during March surveys. The incidence and severity of bacterial blight on Deltapine cultivars has been significantly reduced in recent years. The disease was not observed during the November 1991 survey. Verticillium wilt was present in a significant proportion of the fields inspected in all areas. The disease was most prevalent in crops in the Namoi valley where it was present in over 90% of crops and where the mean incidence for the last three seasons has been over 25%. The increasing incidence of verticillium wilt in individual fields that have been surveyed on several occasions during the last six seasons is of particular con cern. Seed/seedling losses have varied from 27.5% in the 1991/92 season to 41. 2% in 1989 /90 with the greatest losses occurring in the Macquarie Valley. The incidence of Phytophthora boll rot has generally been low although wet conditions in February 1990 resulted in a mean incidence of 2 .67% with up to 26% of bolls affected in one crop. Alternaria leaf spot was rarely observed in New South Wales with the exception of some isolated areas. The disease was regularly observed causing some defoliation late in the season in crops on the property 'Red Mill' north-east of Moree. Low infestations of Alternaria leaf spot are often seen in the Maules Creek area east of Narrabri and the disease was also observed on crops of 'Pima' in the Bourke area in February 1992. Over recent years and in most gin yards there h as been an increasing occurrence of module rot associated with the entry of water into the module - especially around tarp ropes. The seed cotton becomes discoloured and a species of Coprinus (the 'inky cap' mushrooms} is often present.