Fungus on the crops can be controlled by using

Explanation:

Fungicides are agents that are used to prevent or eradicate fungal infections from plants or seeds.

Fungus on the crops can be controlled by using:-

Start by planting healthy stock.  

Choose planting sites based on plant needs.  

Avoid overhead watering.  

Water early in the day.  

Don't crowd plants.  

Don't work a wet garden.  

Treat with a trusted, proven fungicide.

Explanation:

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if you mean hydrogen and oxygen then water is the product