Question

treating with fungicides before sowing the seeds is necessary.why?

Answer 1

Its mainly done to prevent seed-borne diseases.However,seeds may germinate,even if not treared with fungicides solution.
Fungicide seed treatment protects seeedlings from both seed-borne pathogen as well as soil-borne pathogens.

Answer 2

Ans.

Fungicides are chemical agents that kill fungi and fungal spores. Seeds are treated with fungicides and other biocidal compounds before sowing to disinfect them from soil-borne or seed-borne pathogenic fungi present on seed surface.

It prevents spreading of fungal-borne plant disease and improves seed germination.