Like with many other fungal diseases, improving air circulation through proper spacing and hydrangea pruning helps combat rust. Rust can weaken the plant and any infected leaves need to be removed, and any fallen leaves picked up and disposed of. The signs of rust are rusty-orange or reddish-brown spots on the underside of leaves, often along with yellowing leaves and defoliation.
Rust on hydrangeas can be a common disease and it is a fungal problem that thrives in humid conditions.
Pathogens must make contact with treatment, ergo preventive treatments not possible.’ Powdery mildew covers leaves in a white coating (Image credit: Alamy/Nigel Cattlin) 2. She adds: ‘Treatments prevent spread and are specific to each disease. Lorraine Ballato warns that, with all fungal diseases of hydrangeas, the problems ‘can be treated once discovered but can’t be reversed’. You can get fungicides to treat powdery mildew that can help to manage the problem, such as Earth's Ally Disease Control Concentrate, available at Amazon. Watering hydrangeas is best done at the base of the plant and avoiding overhead watering, which is an often-seen garden watering mistake, can stop the spores from being dispersed from leaves to leaves. Correct planting of hydrangeas at good spacings in well-ventilated areas, with opportunity for airflow, can help reduce the risks of infection. It can be caused by poor air circulation. Affected parts of the plants may also show signs of distorted growth. Powdery mildew on hydrangeas is caused by fungal pathogens and shows as white or grey powdery coatings on leaves and flowers. Blooms and leaves can show signs of hydrangea diseases (Image credit: GettyImages) 1. This includes cleaning up debris and fallen leaves along with the ‘sterilization of all tools and surfaces with disinfectants’ in order to help prevent the spread of both fungal and bacterial diseases. The hydrangea expert also recommends that ‘garden sanitation is a key control method’ along with ensuring good air circulation through plants.
Lorraine Ballato, author of the bestselling book Success with Hydrangeas, available on Amazon, advises that ‘regular, frequent scouting is critical so you can deal with conditions at early stages to control the spread’ of hydrangea diseases. Never add diseased plant material to your home compost. The infections are often systemic and there is no cure, so unfortunately immediate removal and disposal of infected plants is recommended. The fungal spores can be spread from plant-to-plant by the rain, wind, and also by gardeners on their tools and bodies.īacterial diseases can hit most of the plant’s tissues and are often spread by insects or tools. Fungal diseases are caused by spores and tend to affect the flowers and foliage. Hydrangea diseases can be classified into two groups, either fungal or bacterial.
#BOTRYTIS BLIGHT HYDRANGEA HOW TO#
Hydrangeas are impactful shrubs for the yard (Image credit: mauritius images GmbH / Alamy Stock Photo) How to spot hydrangea diseases This includes the signs to look out for, what can be done to alleviate the potential risks, and what remedies are out there if your plants succumb to any of the diseases. If you are growing hydrangeas for these reasons and more, and want to discover more about hydrangea diseases, we take a look at eight of the most common.
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