Introduction

Blackberry bushes are a delicious and rewarding addition to any garden, but they require special care during the winter months to ensure a bountiful harvest the following year. This guide will provide you with all the information you need to prune, protect, and winterize your blackberry bushes for optimal growth and productivity.

Pruning Blackberries in Winter

Pruning is an essential part of blackberry bush winter care. It helps to remove weak and unproductive canes, improve air circulation, and promote new growth.

Identifying Canes

Before you start pruning, it’s important to identify the different types of canes on your blackberry bushes:

• Primocanes: These are first-year canes that have not yet borne fruit.
• Floricanes: These are second-year canes that have already fruited.

Pruning Erect Canes

For erect blackberry canes, prune in late winter. Remove all weak and spindly canes, leaving only the three or four strongest canes per plant. Cut back long, trailing branches on the remaining canes to 12-18 inches.

Pruning Trailing Canes

Trailing blackberry canes should also be pruned in late winter. Unlike erect canes, trailing canes lie on the ground. Prune them in the same way as erect canes, but only prune in the very beginning of winter, not the very end.

Winterizing Blackberries

Winterizing blackberries is crucial to protect them from extreme cold temperatures. The level of winter protection needed will depend on the cultivar you’re growing and your local climate.

Frost Tender Varieties

Frost tender blackberry varieties can survive temperatures down to 10 degrees Fahrenheit. If you expect the temperature to drop below this, you’ll need to take extra steps to protect your plants.

Hardy Varieties

Hardy blackberry varieties can survive temperatures down to -10 degrees Fahrenheit. These varieties generally require less winter protection.

Trailing Canes

After pruning, remove trailing canes from their stakes and lay them on the ground. Cover them with a thick layer of mulch for insulation.

Erect Canes

Erect canes are more cold-tolerant than trailing canes. If you expect extreme cold or chill winds, you can construct a windbreak around your plants for additional protection.

Additional Tips for Winterizing Blackberries

• Choose the Right Variety: Select blackberry varieties that are suited to your local climate and USDA plant hardiness zone.
• Water Regularly: Water your blackberry bushes deeply before the ground freezes. This will help to hydrate the plants and prevent them from drying out during the winter.
• Avoid Fertilizing: Do not fertilize your blackberry bushes in the fall or winter. Fertilizing can stimulate new growth, which is vulnerable to cold temperatures.
• Remove Debris: Clean up any fallen leaves or debris around your blackberry bushes to prevent disease and pests from overwintering.

Conclusion

By following these tips, you can help your blackberry bushes survive the winter months and thrive in the spring. With proper care, you’ll be rewarded with a bountiful harvest of delicious blackberries for years to come.

Blackberry anthracnose is a common fungal disease that affects blackberries and other brambles, such as dewberries, loganberries, and raspberries. It can cause poor fruit quality and production, and in severe infections, it can weaken or even kill canes.

Symptoms of Blackberry Anthracnose

The first signs of blackberry anthracnose are small purple spots on the shoots of new canes in the spring. These spots will increase in size, become oval-shaped, and eventually turn a gray or buff color. You may also find small spots with light gray centers and purple margins on the leaves. In heavy infections, the spots on the canes and stems can merge together, forming large cankers with cracks.

Causes of Blackberry Anthracnose

Blackberry anthracnose is caused by the fungus Elsinoe veneta. The fungus overwinters in diseased canes and releases spores during rainy periods in the spring and summer. The greatest risk of infection is between bud break and pre-harvest, as the fungus targets mainly new growth.

Treatment for Blackberry Anthracnose

The best way to control blackberry anthracnose is to use a combination of cultural practices and fungicides.

Cultural Practices:

• Plant resistant varieties of blackberries.
• Space plants properly and prune to improve air circulation.
• Remove any wild brambles in the area, which can harbor the disease.
• Remove weeds and prune back blackberry bushes to promote good air circulation and light penetration.
• After harvesting blackberries, remove and destroy any canes that have been infected.

Fungicides:

• Apply a delayed dormant spray before growth starts and while temperatures are still cold.
• Use a lime, sulfur, copper hydroxide, or foliar fungicide.
• The recommended type of fungicide may vary depending on your area, so check with your county extension office for the latest information.

Prevention of Blackberry Anthracnose

The best way to prevent blackberry anthracnose is to start with healthy plants and to follow good cultural practices.

• Buy disease-free plants from a reputable nursery.
• Plant blackberries in well-drained soil.
• Water blackberries deeply and regularly, especially during hot, dry weather.
• Fertilize blackberries according to the soil test recommendations.
• Mulch around blackberry plants to help retain moisture and suppress weeds.
• Avoid overhead watering, which can spread the fungus.
• Inspect blackberry plants regularly for signs of disease.

Additional Information

Life Cycle of the Anthracnose Fungus:

The anthracnose fungus overwinters in diseased canes. In the spring, the fungus produces spores that are spread by wind and rain. The spores infect new canes through wounds or natural openings. The fungus then grows inside the cane, causing the characteristic symptoms of anthracnose.

How to Identify Blackberry Anthracnose:

Blackberry anthracnose can be identified by the following symptoms:

• Small purple spots on new canes in the spring
• Oval-shaped, gray or buff spots on canes and stems
• Small spots with light gray centers and purple margins on leaves
• Cankers with cracks on canes and stems

Home Remedies for Blackberry Anthracnose:

There are a few home remedies that may help to control blackberry anthracnose, but they are not as effective as fungicides.

• Baking soda: Mix 1 tablespoon of baking soda in 1 gallon of water and spray on blackberry plants.
• Apple cider vinegar: Mix 1 cup of apple cider vinegar in 1 gallon of water and spray on blackberry plants.
• Garlic: Crush garlic cloves and mix them with water. Spray the mixture on blackberry plants.

Organic Treatment for Blackberry Anthracnose:

There are a few organic fungicides that can be used to control blackberry anthracnose.

• Serenade: Serenade is a biofungicide that contains the bacterium Bacillus subtilis.
• Actinovate: Actinovate is a biofungicide that contains the bacterium Streptomyces lydicus.
• Mycostop: Mycostop is a biofungicide that contains the fungus Trichoderma harzianum.

When to Use a Delayed Dormant Spray:

A delayed dormant spray is applied before growth starts and while temperatures are still cold. This is the best time to apply a fungicide to control blackberry anthracnose because the fungus is most vulnerable at this stage.