In a liter Water Mix 20 to 50 ml neem Oil,and Spray to the Plants.If the Infection is Severe repeat the Spray once or twice at a weeks interval.
Both products are excellent. Spray is of good quality & sturdy. Easy to operate. The neem oil is also effective. My all plants were infected with white disease on leaves. I applied neem oil mixed with water for consecutive three days & all disappeared. Effective without foul odour like other pesticides & being natural safe also.