Sulphur fungicide can be freely used on all the vegetables except . . . . . . . .

Sulphur fungicide can be freely used on all vegetables except cucurbitaceous vegetables, as because most of the plants of the cucurbit family are sensitive to Sulphur, and it may injure plants, especially at high temperatures.
Elemental sulphur can be in dust form or as a wettable powder. However, the most popular fungicides in sulphur groups are the organic compounds known as dithiocarbamates.
These sulphur fungicides Control diseases in fruits, vegetables and flowers. Effective against powdery mildew, rust, scab, brown rot, rose black spot and many more.