The answer to what to remove first when pruning is simple. Cut the 3 Ds: dead, damaged, and diseased wood. Get all of these out before you touch any healthy branch. This single rule saves your tree from disease and helps you see the real structure.
I learned this pruning order the hard way on a young plum tree in 2016. I started shaping the canopy first. After 20 minutes I found a dead branch near the trunk. By then I had already cut healthy wood I should have kept.
Once I trained myself to start with the 3 Ds, my pruning sessions got faster and cleaner. About 70% of my planned cuts vanish on their own once dead and damaged wood is gone. The tree shows you its true shape with no rotten parts in the way.
Dead wood holds fungal spores and wood-boring beetles in the cracked bark. Every cut you make near dead wood can spread spores onto your blade. Then your blade carries those spores to every healthy branch you touch next.
Damaged wood from storms or wind splits acts the same way. Open wounds in the bark let germs in. The wood inside starts to rot even while the outer bark still looks alive.
Diseased wood is the biggest threat of all. UC Marin warns that silver leaf disease lives in dying wood on stone fruit. Each cut into infected wood can release millions of spores into the air.
Your first cuts pruning session should start with a slow walk around the tree. Look up at every branch. Spot the gray bark of dead limbs. Look for splits, cracks, and dark sunken spots that mark damage or canker.
Mark each problem area with bright tape before you cut anything. This gives you a clear plan. You will not miss a dead branch hidden behind healthy growth.
Cut dead wood first since it carries no live germs. Move to damaged wood second. Save diseased wood for last so you can sanitize your tools once and put them away.
Nebraska Extension says to dip your blades between cuts. Use a 1:9 bleach solution for 30 seconds. This kills germs on the blade. It stops the spread within the same tree. Skip this step and one sick limb infects ten.
How can you tell dead from live wood? Scratch the bark with your fingernail. Green underneath means alive. Brown or gray underneath means dead. This quick test works on any branch in any season.
Dead wood removal should be complete before you start any thinning cuts. Cross your full circle around the tree twice. Look up. Look low. Look at the inner branches that hide behind outer limbs.
Only after every dead, damaged, and diseased piece is on the ground can you start thinning. This second step opens light and air to the inner canopy. Skip ahead and you cut blind without seeing the real shape of your tree.
Burn or trash all the cut wood right away. Never leave it on the ground near the tree. Spores can travel up from the soil and reinfect the same tree the next spring.
Keep your sessions slow during this first stage. A clean 3-D pass takes me about 45 minutes on a mature apple tree. The thinning and shaping that comes next takes only 30 more after that work is done.
Read the full article: Pruning Fruit Trees: 8 Expert Steps
