Rice blast disease at the tillering stage

This rice field has been planted for about 20 - 25 days. Usually, rice blast disease will appear at this stage, at the tillering stage. This is a rice blast lesion that appears at the tillering stage, this lesion appeared about 5 to 7 days ago and the farmer has treated it, so we see that the lesion has dried up.
This is also a rice blast lesion that has not completely disappeared because there is still a gray color around the lesion. If we see a red border around the lesion and the inside is bright, the lesion has disappeared, so the treatment has been successful. Therefore, to prevent rice blast disease on leaves at the tillering stage, after the second top dressing about 18 - 20 days, we must spray rice with rice blast prevention fungicide.