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10 Common Plant Diseases

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A plant disease takes place when an organism infects a plant and disrupts its normal growth habits. Symptoms can range from slight discoloration to death of the plant. Diseases have many causes including fungi, bacteria, viruses, and nematodes. Below are 10 of the most common diseases affecting ornamental trees and shrubs:

Here Are 10 Common Plant Diseases In North America:

1. Blight

Blight is easily recognizable by the sudden death of all plant tissue including leaves, stems, and flowers. Typically caused by wet and humid conditions, blight is common across North America.

2. Canker

Canker is identifiable by a dead area on the stem that is often discolored.

3. Gall

Leaf gall is a swelling that occurs on plants. Galls form on roots, stems, and branches and are known to be caused by root knot nematodes and insects.

4. Leaf Curl

Leaf curl is when leaves begin to curl and wilt. This is caused by several viruses.

5. Leaf Spot

Leaf spots are yellow or brown lesions (often look like burn marks) that take place on leaves. Pathogens, fungi, pesticide damage and insect feeding can all cause leaf spots.

6. Powdery Mildew

Mildew is one of the least harmful diseases that occurs on plants. It is easy to identify by a grey or white powdery coating on the plant. It is caused by fungal pathogens.

7. Root Rot

Simply put, rot is when plant tissues begin to rot away. They become thin and weak, they appear wet or dry and the plant begins to decompose. The cause of rot is pathogens and fungi.

8. Wilt

Wilt is when leaves start to drop down and the plant begins to appear lifeless.  Over or under watering and pathogens are common causes of wilt.

9. Stunting

Stunting is when plants do not grow to normal size. Nutrients, pathogens or damage to the roots are common causes of stunting.

10. Chlorosis (Discoloration)

Chlorosis is when a green tissue turns yellow, this is known as Chlor. It has many causes including pathogens, lack of nutrients, and lack of water.

Unfortunately, there are many diseases out there that can impact the color and vigor of our plants. In some cases they can even infect our entire gardens and cause our precious plants to die completely. Knowing the symptoms of plant disease can help us identify problems early and help us protect our landscapes.

What To Do If You Suspect A Plant Disease:

If you suspect that you have a disease in one of your plants it is best to call a professional to inspect it. Sometimes it can be a very simple solution, but if left unchecked it can impact your other plants. Give us a call to book an appointment or book a Tree and Shrub care package online.

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