Powdery mildew on ornamental plants

Characteristics of powdery mildew  Powdery mildew is a common fungal disease that infects a broad spectrum of plants, including trees and shrubs, perennials, grasses, fruits and vegetables. It is not a single disease but is caused by a group of…

Diseased tree and plant beneath it

Hello, We have a huge maple ( Norway?) which shades a rock garden on a hill in the backyard. We live in Scarborough southwest 1.4 kms from the lake. This year most of the leaves have a raised bump as…

Maple tree fungus

I have a city tree (planted 4 years ago(?)) that had had a fungal infection for the last three years. Year by year the tree looks worse. How can I get the city to replace with an appropriate tree. I…

Coreopsis disease

Hi, I had planted native plant Coreopsis lanceolata this spring. It developed some disease so the leaves became kind of gray/white. The new growth did not have that color, but most of the leaves did. It still bloomed well. Is…

Powdery mildew on Hydrangea

Hi. I am a beginner in gardening. I recently purchased the hydrangea in the picture, and some white powder-like markings appear on its leaves. I suspect that those are mildew, and had used Safer’s 3 in 1 Garden Spray Fungicide…

Powdery Mildew on potted indoor Rosemary plant

Good morning. I live in Toronto and have a 3-4 year old potted rosemary that I have been successfully overwintering indoors. Right now though, it is rapidly getting overcome by powdery mildew- worse at the top- and it needs immediate…

Damaged serviceberry branch

Hello – Thank you for reading my question. I was hoping for your advice regarding this Downy serviceberry branch that I realize we should have wrapped when it was first damaged during some construction. It’s now a black gash and…

Autumn Joy stonecrop leaves turning white

I bought 4 small Autumn Joy plants, 2 of which I planted in the ground. The 2 in pots have a white splotchiness on the leaves. What is this and what shroud I do about it?…

powdery mildew on peonies *

I have several peonies. Several, but not all, are covered with white mildew. Will this weaken/kill the plant. What can I do to prevent this. I have cut off the deceased stalks and cleaned up the area from any debris.…