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2 Answers

Are your hostas planted in an area where they get a lot of sun?  Hostas are shade-loving plants.  Their leaves may turn brown if they are exposed to hot sun.  This may be the reason they are turning brown.  This is not caused by a disease.  There is not much you can do except to move them to a shadier area.
Mine have morning sun and afternoon shade.  Seem to be doing ok when I use 1 teasp liquid soap & 1 qt water and spray to keep the bugs at bey.

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