Over all crop Postion are good but Some Plant are unhealthy and also Some Pest attack of thrips, white fly and aphid , therefore I Spray Intracol 500 g / Acre and Novastar 500 ml / Acre. Am I write or wrong ? please give me better sugetion

Hi Mohammad Bilal please add mores pictures of symptoms

Older leafs are falling down

Dear spray bifenthrine+progib and apply Chlorothalonil or pyraclostrobin after 5-7 days dear Mohammad Bilal

Hi Mohammad Bilal as per your image it seems due to Early Blight disease. It is very common disase of potato crop. Please click the above link to know all information about this disease. I hope you will get better results JazakAllah. Thanks for using plantix community 😊

Mohammad Bilal Please click the below link to know all information about the pest Whiteflies Aphids Thrips

Yeah Mohammad Bilal there is the Infestation of alternaria (fungus)