Why this plant dying?

Ahmed Shendy Looks like stem rot initiation. Better to use Thiophinate methyl

Thank you Venkat Pawar. , I am learning about this and will find this product local here.

Venkat Pawar. Thought to ask since I have this home, can I use the hydrogen peroxide?

Ahmed Shendy Yes you can use 1.5 ml per litre

Hi Venkat Pawar. , just wanted to share this picture with you, one of the dying leaves turning like this .. this still relate to stem rot initiation or might be something else. To add, this morning I found both leaves were kinda getting alive again .. but after some hours in the sun, they are returning back, may be worse than yesterday ... In case this info matters

Venkat Pawar. Sorry to bother you again, if our can teach me how to know if the plant is healed from late blight? That leave will get fully green again or the issue won't spread so I know it is healing now?

Ahmed Shendy Yes new growth will be clear without new infection.

Btw I found the leaf in following pictures look like dying when it is too much sun like getting around 12 pm, and start getting alive again other times like in the early morning.

This is when it is early morning.

And this is when it is 12 pm

I keep noticing this the past days since I wrote this post, but just took pictures to ask if this is normal for potato or relates to late blight too

Ahmed Shendy Infection is still there

Venkat Pawar. How to know it is not there? What will happen so I know this?

Ahmed Shendy Blight affected areas completely becomes dry like burnt appearance.