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  • Writer's pictureKelly Robinson

What is fire blight?

Updated: Jun 5, 2023


What is Fire Blight?
Standard display of fireblight as seen in Denver, Colorado


Fireblight, also known as Erwinia amylovora, is a bacterial disease that affects a wide range of plants, including fruit trees, ornamental shrubs, and wildflowers. This disease is particularly prevalent in areas with warm and humid weather, making it a common problem in many urban environments.

Fireblight is caused by a bacteria that enters the plant through flowers, leaves, or fruit and infects the plant's cells. Symptoms of the disease include wilted, blackened leaves and shoots, which give the plant a scorched or "burnt" appearance, hence the name "fireblight." The disease can also cause cankers on the branches and trunk of the tree, which can girdle the tree and kill it.

The bacteria that causes fireblight can survive in the environment on infected plant debris, in the soil and in the nectar and pollen of flowers. The bacteria is spread by insects, rain, and wind, which can infect nearby plants. It is particularly active in warm and humid weather conditions, which are favorable for the growth of the bacteria.

The best way to control fireblight is by using a combination of cultural and chemical control methods. Cultural methods include proper pruning, which removes infected plant material, and maintaining the overall health of the tree, which makes it less susceptible to the disease. Chemical control methods include using antibiotics, which can be applied as a preventative measure or as a treatment for an existing infection.

It is important to note that when using antibiotics, it is essential to follow the manufacturer's instructions and to be aware of any potential risks or hazards to the environment and human health. Consult with a certified arborist or a professional pesticide applicator to ensure the proper and safe use of antibiotics.

Preventive measures also include selecting disease-resistant cultivars, avoiding over-fertilization, and avoiding high-nitrogen fertilizers, which can make the tree more susceptible to the disease. Additionally, removing and destroying infected plant material, keeping the area around the tree clean, and avoiding overhead watering or irrigating during the evening hours, to reduce the humidity and moisture on the plant.

In conclusion, fireblight is a serious bacterial disease that affects a wide range of plants in urban environments. To prevent and control this disease, it is important to practice good cultural management techniques and to use chemical control methods when necessary. With proper care and management, it is possible to keep your plants healthy and free of fireblight.

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