It is a fungal disease. In the early stages, black spots appear on the leaves and the leaves appear water-soaked. In the acute stage of the disease, a sticky substance starts coming out from the stem of the plant, then the leaves begin to wither and eventually the plant dries up. The black rot disease causes heavy damage to the crop, which becomes difficult to compensate. For its control, 25 grams of armor per tank. or Blytax, 30g. Mix and spray.