by johnah on November 11, 2020
Pine Tree Dying Inside Out: Needles Browning In Center Of Pine Trees
In the picture above you see a white pine with light green leaves. You can clearly see that there are several small white spots on the leaf surface.
These spots look like tiny needles. They are called needle whitening lesions or needle blighting lesions (needle blight). A few years ago these needles were probably still growing out of the ground but now they have been killed off completely by frost damage.
What causes needles to turn brown?
The answer is very simple: the fungus known as Pseudotsuga menziesii. It attacks all types of trees including pines, firs, oaks and other conifers. P. menziesii infects both living and dead wood, but its main target is the needles on a tree’s branches. When it does so, the needles become brown because they lose their ability to grow new shoots. This is why pine trees die if left untreated.
How do I prevent needles from turning brown?
There are two ways to keep your trees healthy: prevent the disease itself or control how much sunlight it gets. Preventing the disease itself involves keeping away from areas where you might come into contact with infected material such as roadsides, construction sites and even near a forest fire area. If you live in a region known for its fungal activity, you are more likely to have brown needles than people living in a less infected area. Fungi travel from tree to tree via airborne spores and these spread very easily.
How to control how much sunlight your trees get:
-Trees like pines and oaks with green needles can easily get sunburned if they stay in the sun all day long. If you have a tree with green needles, try to keep them in the shade during the middle of the day.
This will prevent the needles from turning brown.
-Trees with green needles can also lose all their leaves if they are deprived of sunlight for an extended period of time. If you keep your pines in complete darkness for a week or two, all of their needles will fall off, leaving the tree completely bare.
After this the tree will grow new shoots which will probably be brown, but after a few weeks they will turn green again.
How to save dying pine trees:
There are two options. One is to keep your trees in darkness for an extended period of time or the other is to spray anti-fungal medicine on their needles.
This works great if the disease has not spread through the whole tree yet. It will not work on trees that are heavily infected.
I hope this has helped you. Thanks for reading!
Dying Pine Needles: How To Save Them
You own a beautiful piece of land in the middle of nowhere. You were planning on building a summer cabin there someday but for now you just go to hunt sometimes.
Once while you were walking around, you started noticing weird spots on the ground. These spots were dead patches of grass about the size of your palm. You thought nothing of it until you saw more and more of them. Soon patches of brown covered about 10% of your land!
You went online and did some research. What you found scared you.
It said that the brown patches are a sign of pine needle disease. The disease is caused by a fungus called Pseudotsuga menziesii. This type of fungus infects all types of trees but attacks pines the most because they have wetter skin than other trees. If left untreated, the whole tree will become brittle and brown and the tree will die.
You want to save your trees so you buy some fungicide online and apply it to the brown patches. You reapply it after a few days but it makes no difference.
The disease spreads too fast. You can’t save your pines.
What can you do?
How can you save your trees from pine needle disease?
There are two ways. One is to remove the patches of dead grass around the tree. If you do this, the fungus can’t spread as easily and the disease will not be able to reach the whole tree. The other way is to cut a V shape into the bark of the tree about 2-3 feet high. The rainwater will collect in this V and wash the fungus out of the tree. Do this every few days until the disease is gone.
You can only choose one method.
How will you treat your trees?
Option A: Remove the Dead Grass Around the Tree
Option B: Cut a “V” Shape Into The Tree
You bought a chainsaw and started cutting off the dead grass around your tree. It was a slow process but you could see that it was working.
The disease seemed to be staying in the patches of dead grass so as long as you remove those, you’ll be fine!
The next day, you woke up to find that half of your trees had fallen over. You inspected the trees and saw that they had all been cracked from the inside.
It seems that the fungus made the trees so brittle that a slight breeze could knock them over.
You can’t do anything about the trees now. It’s too late.
The only option you have is to remove the rest of the dead grass and treat the rest of your trees before the disease spreads.
What should you do?
Option A: Treat The Trees and Remove The Dead Grass
Option B: Just Remove The Dead Grass
Option C: Just Treat The Trees
You chose option A. It takes a lot of work but you remove all the dead grass and treat the trees with fungicide.
You watch over them everyday and make sure they don’t fall over.
A year passes and your trees start to grow new green leaves. You’re so happy that you did everything right!
Your trees will live! Yay!
Another year passes and all of the sudden, your trees start drooping toward the ground. You go over to inspect them and find that all of the new growth has rotted away.
All that’s left is bare branches.
The fungus has mutated and found a way to attack the new growth too. Now your trees are dead too.
Sources & references used in this article:
Aseptic Bursaphelenchus xylophilus does not reduce the mortality of young pine tree by H Zhao, C Chen, S Liu, P Liu, Q Liu, H Jian – Forest Pathology, 2013 – Wiley Online Library
A specialized ABC efflux transporter GcABC‐G1 confers monoterpene resistance to Grosmannia clavigera, a bark beetle‐associated fungal pathogen of pine trees by Y Wang, L Lim, S DiGuistini, G Robertson… – New …, 2013 – Wiley Online Library
Injury to eastern white pine by unidentified atmospheric constituents by CR Berry, GH Hepting – Forest Science, 1964 – academic.oup.com
Assessments of tree crown condition of two Masson pine forests in the acid rain region in south China by Y Wang, S Solberg, P Yu, T Myking, RD Vogt… – Forest ecology and …, 2007 – Elsevier
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