There are two very important phases about late Blight Disease. One is before the disease appearance and the other is when disease appears. Before disease, spores killing fungicide called Fenyl-Amid Fungicide should be sprayed. When disease occurs, another fungicide should be applied. In this video, the latest chemical to cure & eradicate the late blight.
Very informative video.
1st part link : • Most Critical Stage of Potato Crop
2nd part link: • The best Spray, before Late Blight appearance