Paying attention to our weather will give you advanced warning on what will be happening with your plants. Last spring I warned of all the fungal diseases that would be present from all the rainy weather we had in the spring season. What a year it was! We had problems with fungal diseases showing up on plants that are normally resistant. Last season, it was the most common issue to deal with in the landscape.
Well…here we are again. Only this time, it is one of the wettest seasons on record. Brace yourself and keep an eye out for strange disease situations this summer because this is when damage from spring infections begin to show most. So what do you do? First, understand that for most trees and shrubs, infection happens in the spring. Therefore it has already happened. Second, most copper-sulfate fungicides will help suppress many of the fungal diseases therefore applying treatment as soon as you notice the damage may help a little. The real help will come in making sure the tree is on a deep root fertilization program (or similar) by setting up protection treatments to break the cycle for next spring since this is when the majority of infection occurs.
When plants are stressed, they need help so they are not overcome by other diseases while they are in a weakened state. Deep root fertilization gives them all the nutrients they need to get their vigor up while spring treatments will break the cycle from weakening your plants further.
As you start seeing unusual symptoms on your plant, quickly call Pat Morren, Tree & Shrub Care Manager, and he will have someone stop out to evaluate your situation before it is too late to control. Too often we are called out to help when it is far too late to help the plant in question. The pictures below show fungal diseases on various leaves and a tree.