How to prune apricots against branch dieback: complete guide

Why branch dieback on apricots?

Apricots are tempting: early blossoms, sweet fruit, compact size. But they have a dark side: monilinia branch dieback. This disease attacks blossoms, young shoots, and fruit. It starts innocuously (brown blossoms) but spreads fast via damp air and damaged wood. Before you know it you lose large branches.

Pruning is your best defense. An open tree dries out, no branches overlap, damage gets removed quickly. A dense, humid tree is a disease magnet.

The pruning cycle against branch dieback

Apricots require TWO pruning moments for health:

Spring sanitation pruning (March-April): Remove diseased branches after you can see them (wilted, brown-discoloured wood). This stops disease early.

Summer selection pruning (June-July): Thin fruit selectively and remove damaged shoots while you see where disease strikes.

No autumn pruning: October pruning brings risks. Wet autumn closes cuts slowly. Better wait until March.

Spring sanitation pruning (March-April)

In March, as your tree awakens and you see first growth, scan for diseased wood.

Signs of monilinia:

• Brown-discoloured wood (not greenish-brown, but DARK brown or grey).
• Wilted twigs with dead leaves that stick.
• Gum secretion (resin flow) from bark cracks.
• Brown "oysters" (fungal structures) on stems or leaf scars.

Pruning strategy:

1. Cut out all diseased wood. Cut FURTHER than where you see disease - 10-15 cm healthy wood past any diseased section.
2. Disinfect your secateurs between each cut with 70% alcohol or bleach water (1 part bleach, 9 parts water).
3. Remove all pruned wood from the tree entirely. Do NOT leave it on the ground (spores).

Open up: Apricots grow dense. Remove branches that:

• Touch or overlap.
• Hang DOWNWARD (traps moisture).
• Grow INWARD (suffocates center).

Goal: you can easily pass your hand through the crown without touching branches.

Summer selection pruning (June-July)

In June-July, as your tree blossoms and sets fruit, scan again for monilinia signs:

• Shriveled fruit (red-brown spots).
• Shoots that wilt prematurely.
• Gum secretion on stems.

Selection pruning:

1. Cut out shriveled fruit plus 5 cm surrounding shoot.
2. Remove wilted shoots entirely (cut to healthy wood).
3. Remove shoots that overlap or shade each other.

This does three things:

• Disease spread stops.
• The tree dries out (fungi hate that).
• Remaining fruit gets more nutrition and sun.

Small cultivar differences

Goldrich, Bredase: More prone to monilinia. Extra summer pruning needed. Scout multiple times.

Royal Apricot, Tilton: Slightly more tolerant. But still annual spring sanitation pruning essential.

Tomcot, Sweetheart: Average susceptibility. Follow standard twice-yearly pruning.

Frequently asked questions

Can I prune in autumn to prevent disease?

No. Autumn pruning (October-November) raises risk. Wet autumn closes wounds slowly. Better: spring sanitation pruning and summer selection pruning.

My tree shows lots of diseased shoots. Can I save it?

Yes, but aggressively. March: cut ALL brown/gummy wood out. Disinfect secateurs and alcohol. Your tree looks bare, but that is good. It grows back.

Should I treat my apricot with fungicide?

Fungicide helps (e.g. tebuconazole, fluquinconazole). But pruning is the FIRST line. Chemistry supports, pruning prevents.

Why did my tree die last year but grows now?

Monilinia kills wood but rarely kills the tree. What died last year is dead last year. What grows this year grows. Focus on health THIS season with pruning.

Step-by-step

Step 1: March - Scan and remove diseased wood

In March scan your tree. Cut out all brown, gummy, wilted shoots. Cut FURTHER than disease. Disinfect secateurs.

Step 2: March - Open the tree

Remove overlapping branches, inward-growing wood, and drooping shoots. Goal: hand through crown.

Step 3: June - Summer pruning

Scan again for shriveled fruit and shoots. Cut diseased fruit and surrounding wood out. Remove overlapping shoots.

Step 4: June - Thin fruit

Leave only healthy fruit: evenly spread, not too crowded (disease spreads fast in dense harvest).

Frequently asked questions

Can I prevent my tree from ever getting monilinia?

Unfortunately no. Monilinia is everywhere. But healthy, open trees suffer less damage. Prune for prevention, not cure.

My tree has been struggling for years. Lots of it is dead wood. Start fresh?

Yes. March: cut EVERYTHING out to healthy green wood. Start clean. The tree grows back strong.

How do I know if wood is healthy?

Healthy wood is green or light-brown inside. Diseased wood is dark-brown, grey, or red. Cut until you see green.

Discover your own garden design

At [gardenworld.app](https://gardenworld.app) you can upload your front yard and see how healthy apricots fit - with good drying airflow and realistic forms. Plan your fruit corner before you plant.