Cane Blight: An In-Depth Look at a Threat to Berries and Ornamental Plants

Cane blight is a serious fungal disease that mainly affects plants with woody canes such as raspberries, blackberries, and certain ornamental shrubs. Left untreated, it can lead to significant crop loss and deterioration of the plant’s overall health. In this comprehensive guide, we’ll explore the symptoms, causes, lifecycle, prevention, and management of cane blight.

What is Cane Blight?

Cane blight is caused by the fungus Leptosphaeria coniothyrium, also known as Kabatiella apocrypta. This disease usually enters the plant through wounds, often resulting from pruning or insect damage, and progresses to infect the canes, leading to dieback.

Symptoms of Cane Blight

  • Cankers: Dark, sunken lesions appear on the canes.
  • Wilting and Dieback: The infected part of the cane wilts and dies back.
  • Leaf Discoloration: Leaves may become red or purple before wilting.
  • Bleeding: In some cases, canes may exhibit a ‘bleeding’ effect, with a dark liquid oozing from the infected area.
  • Fruit Infection: The disease can also affect the fruit, leading to poor quality or crop loss.

Lifecycle of Cane Blight

  1. Entry Through Wounds: The fungus enters the plant through wounds created by pruning, harvesting, or insect activity.
  2. Incubation: The fungus incubates inside the plant without visible symptoms for a period.
  3. Infection and Spread: Infected canes develop cankers and other symptoms, and the disease can spread to other parts of the plant.
  4. Overwintering: The fungus can overwinter within infected canes, causing new infections in the spring.

Preventive Measures

Prevention is often the most effective way to deal with cane blight:

  • Prune Correctly: Use clean, sharp tools, and prune during dry weather to minimize wound infection.
  • Remove and Dispose of Infected Material: Regularly inspect plants and remove any infected canes. Burn or dispose of them properly to prevent spread.
  • Avoid Overhead Watering: Watering from above can spread the fungus. Use drip or ground-level watering instead.
  • Maintain Proper Spacing: Ensure that plants are spaced adequately to allow air circulation, reducing humidity around the canes.
  • Fertilize Appropriately: Avoid excessive nitrogen fertilization, which can make plants more susceptible.

Treatment and Control

If cane blight is detected, several measures can be taken to control the disease:

  • Prune Infected Canes: Cut back infected canes below the area of infection. Disinfect tools between cuts.
  • Use Fungicides: Specific fungicides can be used to control cane blight. Follow the manufacturer’s instructions and consult local agricultural extension services for guidance tailored to your region.
  • Monitor and Maintain: Keep an eye on the plants and continue to remove any newly infected material promptly.

Impact and Importance

Cane blight can cause significant economic loss for commercial berry growers, as well as aesthetic and enjoyment loss for home gardeners. Understanding the disease, practicing good hygiene, and implementing preventive measures are essential for maintaining healthy, productive plants.


Cane blight is more than just a superficial problem; it’s a serious disease that requires understanding and vigilance to manage effectively. Through proper care, regular monitoring, and timely interventions, it is possible to mitigate the impact of cane blight and enjoy the beautiful blooms and delicious fruits that cane-bearing plants offer.

Whether you’re a commercial grower or a hobby gardener, taking the time to educate yourself about cane blight and investing in prevention and early detection can pay off in the form of healthier, more resilient plants. Remember, collaboration with local experts and extension services can provide additional support and insights specific to your plants and region.