The following are some facts about Magnolia Tree Disease:
Magnolia tree is one of the most popular trees in the world. There are many different varieties of magnolias, but all have a similar appearance. They grow well in shade or full sun and require moist soil with good drainage.
The leaves are opposite, long and narrow at first, then becoming wider towards their tips. Their color ranges from pale yellowish green to bright red.
Magnolia tree is a deciduous tree which means it dies back each year after flowering. The flowers are white or pink and last for several days. After they die down, the wood of the tree becomes brittle and weak.
It may fall over if not pruned regularly. If left unchecked, the decay will eventually kill the tree completely.
Symptoms of Magnolia Tree Disease include:
Weak, wobbly branches. Leaves turn brown and drop off. Fruit falls off before ripening.
Treatment For Magnolia Tree Disease:
Magnolia tree disease is caused by fungi called Fusarium oxysporum f. sp. cubense (FoOx) .
It mainly attacks the tree when it is subjected to heavy pruning and over-watering. You should avoid both these conditions if you want to prevent magnolia tree disease.
For trees that are already infected, there is no cure. You can only treat the symptoms. The tree may survive for up to three years before it begins to show signs of weakness.
If this happens, have the tree removed immediately to prevent personal injury or property damage.
Drought stress can also be a cause of this disease. It is vital that you keep the soil consistently moist but not waterlogged. Avoid overhead watering and make sure the soil drains well.
If you have planted a young tree in a container, move it to a well-draining site as soon as possible.
If you have an older tree with wilting tips, wilted leaves or browning leaves, it may be suffering from drought stress. Be sure to water it thoroughly, preferably with a solution of balanced fertilizer.
How To Prevent & Get Rid of Magnolia Tree Disease:
To prevent magnolia tree disease, you should avoid heavy pruning and over-watering. If you have a young, potted tree and you need to move it, do so as soon as possible. If you have an older tree that is prone to falling over, consider propping it up or having it removed completely.
When pruning any plant, be sure to sterilize your tools between each cut. If you are using a grafting knife or scissors, be sure to wipe them with alcohol or bleach after each cut. This will prevent the spread of fungi or bacteria from plant to plant.
Always wash your hands before beginning work and try not to touch your face as you work, as this can also lead to the spread of disease and infection.
If you have an infected plant, remove it completely from your property. Bag the root ball and dispose of it as you would regular garbage. Be sure to disinfect your pruning tools after removing the plant.
The fungus which causes the disease is also known as Colony Collapse Disorder (CCD). The name is in reference to the phenomenon which occurs when bees abandon a hive, often leaving a queen and no dead bees behind. This also occurs with commercial colonies of European Honey Bees, in which case it may be caused by other Fusarium fungi or Nosema apis.
Some other names for the disease include:
Wych Elm Malaise
Water Elm Malaise
Wych Elm Decline
Elm decline is similar to Dutch elm disease, but some of the symptoms which occur are not typical of Dutch elm disease.
Trees which are infected often display yellowing of the leaves before leaves begin to fall.
The fungus which causes elm decline, Ceratocystis-ulmi, is a extremely aggressive species and can kill an otherwise healthy tree in a matter of weeks. The first signs of infection are small brown patches on the leaf edges or veins. These patches can spread quickly throughout the entire leaf.
Wych elm trees are especially susceptible, but the disease can affect all species of elm. The disease is most likely to occur in wet weather and may increase in incidence after droughts.
The disease often begins in trees which are under stress of some kind. This may include heavy pruning, injury or being planted too deeply. It also causes a yellowing of the leaves before they fall off.
Like Dutch elm disease, the fungus attacks the water conducting vessels in the tree. This prevents water from reaching the top branches and leaves them dry and yellow.
The fungus attacks the base of the tree first. This causes the tree to wilt, often dropping its leaves in the late summer or early fall. The fungus may also cause root suckering and stem forks, which can lead to problems with root and branch integrity.
Sources & references used in this article:
The association of phytoplasma with stunting, leaf necrosis and witches’ broom symptoms in magnolia plants by M Kamińska, H Śliwa… – Journal of …, 2001 – Wiley Online Library
Effect of Antibiotics on the Symptoms of Stunting Disease of Magnolia liliiflora Plants by M Kamińska, H Śliwa – Journal of Phytopathology, 2003 – Wiley Online Library
Experimental transmission of phytoplasmas from diseased magnolias to Catharanthus roseus test plants by grafting by H Śliwa, M Kamińska – Phytopathol. Pol, 2004 – up.poznan.pl
Wpływ antybiotyków na występowanie objawów karłowatości magnolii [The influence of antibiotics on the appearance of magnolia stunting symptoms] by M Kamińska, H Śliwa – Acta Agrobotanica, 2013 – pbsociety.org.pl
Moonlight, magnolias, and madness: Insanity in South Carolina from the colonial period to the progressive era by P McCandless – 2013 – books.google.com
First Report of Canker of Magnolia denudata Caused by Fusarium decemcellulare in Hubei, China by YX Wang, JY Chen, DW Li, JB Huang… – … Disease, 2015 – Am Phytopath Society
Comparative analysis of differentially expressed sequence tags of sweet orange and mandarin infected with Xylella fastidiosa by AA Souza, MA Takita, HD Coletta-Filho… – … and Molecular Biology, 2007 – SciELO Brasil
Efficacy of a Magnolia officinalis bark extract against grapevine downy mildew and apple scab under controlled and field conditions by B Thuerig, J Ramseyer, M Hamburger, M Ludwig… – Crop Protection, 2018 – Elsevier