I saw white things like a fungus in all my leafy vegetables plants and its transfer to all of them. kindly suggest it.thank you.
It would be a great idea to remove the affected leaves and dispose of them. This will assist in ceasing the spread of the disease. As you have mentioned it is likely that it is a white spot fungus. Applications of Yates 150g Mancozeb Plus Garden Fungicide and Miticide would be an appropriate product to treat a fungus. Try to keep your watering to the base of the plant and not the leaves.
I thought I'd mention as well that you have some caterpillar damage and Yates 40g Natures Way Caterpillar Killer Dipel Insecticide will solve that issue.