Loss due to evaporation is reduced by watering during the coolest parts of the day. Watering during the night and early morning reduces the opportunity for many plant diseases to develop. If plant leaves are wet for an extended period of time, many fungi and bacteria can grow and cause plant infections.

Be sure to water only those areas that need to be irrigated. Watering the complete lawn when only a small area requires water, or watering too frequently results in shallow roots, increased susceptibility to drought, and increased vulnerability to diseases. When irrigating turfgrass, enough water should be applied to adequately moisten the entire depth of the
root system. Watering deep and infrequently is best for all plants, including the root system of trees and shrubs.

If you’ve ever had a problem with lawn or garden diseases, avoid irrigating in the evening. Dew begins to form on turfgrass late in the evening in Southern Ontario. Dew is a fluid rich in nutrients which is exuded from the tip of the grass blade. This nutrient rich solution serves as a food source for fungus and bacteria to develop and infect the plant.

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