Spring in southern Ontario means warm, wet weather — and that's exactly what a lot of tree diseases have been waiting for. May is when fungal problems wake up, and when catching them early makes the biggest difference.
What to watch for
Spring moisture on fresh new growth is ideal for fungal infection. The usual suspects across Waterloo Region:
- Leaf spots and blights — including anthracnose on maple and ash, showing as blotches and curling new leaves.
- Apple scab — olive-green to black spots on crabapple and apple leaves and fruit.
- Cankers — sunken, dead patches on bark that can girdle branches.
- Needle-cast on spruces — older needles browning and dropping from the inside out.
- Branch dieback — the visible end-result of several of the above.
Why early identification matters
Most of these are far easier to manage when they're caught at the first sign than after they've taken hold. Some are mainly cosmetic and need nothing more than good cleanup; others are worth a properly timed fungicide program scheduled around bud-break and leaf-out. The key is knowing which is which — over-treating a cosmetic spot wastes money, and ignoring a real canker can cost you a branch or a tree.
Spring disease is a timing game. The same problem is a quick fix in May and a major job by August.
Get an informed read
If you're seeing spots, discoloured leaves, or dieback as your trees flush out, book an assessment. We'll identify what's actually going on and tell you honestly whether it needs treatment or just patience.