Take care to identify the disease correctly so that the proper fungicide can be selected. Identify any fields that have had chronic disease problems. Ensure that you check for these diseases when scouting. 2 Scout weekly. Check the most disease-prone locations first.
Foliar diseases tend to be worse in thick growth.
Row ends, where seeding and fertilizer rates are inadvertently high, often have the heaviest disease pressure. Soil-borne viruses often occur in low, wet areas. 3 Scouting requires examination of 5-10 randomly selected sites that represent the character of plants within the field. Closely examine the leaves of each of the plants selected. The use of a magnifying glass or hand lens may be particularly useful, especially when first beginning to scout.