Weather conditions in the St. Johns area can swiftly change, monitor weather conditions closely throughout the day.
If you see anyone spraying pesticides in today's conditions please report the activity.
Do not spray pesticides before or after a rain.
Runoff is the movement of water over a sloping surface. Runoff occurs when water is applied to the soil at a faster rate than it can enter the soil. Runoff water can carry pesticides in the water itself or bound to eroding soil particles. Pesticide runoff is usually greatest when rain follows soon after an application. Runoff can also occur if a pesticide is applied to a saturated soil, resulting from a previous rain or irrigation, followed by a light rain or irrigation.
Leaching is the movement of pesticides through the soil as opposed to movement over the surface. The more permeable a soil, the greater potential for pesticide leaching: A sandy soil is much more permeable than a clay soil.Pesticide leaching can also be influenced by the weather. Typically, the closer the time of application to a heavy or sustained rainfall, the greater the pesticide leaching will occur.
Current provincial weather regulations:
-Wind must be between 2 and 15 km/hr for ground applications
-Winds must be between 2 and 10km/hr for trees taller than 3meters
-Air Temperature must be below 25oC
-It must not raining nor is rain anticipated over the next 2hour period
-The relative humidity must be above 50%