Dahiya disease is caused by a pest called mealybug. This insect looks like cotton. Mealybugs affect the growth of the crop by sucking the sap of the plant. For its control, the cutter, 5 ml. and Kilmite, 5 ml and Punch, 10 g. Spray it by mixing it in 15 liters of water or Rogarin, 15 ml. and Punch, 10g. Spray it by mixing it per 15 liters of water.