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Magnolias are stunning trees well known for the richly fragrant flowers, the large leathery leaves, and the otherwise glossy, evergreen foliage that makes them coveted among gardeners. You can find deciduous, semi-deciduous, and evergreen varieties with varying sizes and overall shapes easily controlled with basic pruning. However, things can go awry when you start noticing something is eating the leaves off your tree.
What eats the leaves on magnolia trees? You might have issues with a multitude of insects but it’s best to start small and work your way up.
Scale insects are a very common pest problem for almost all plants in a garden including Magnolias. You’ll notice them because of the telltale signs not only of the insects themselves but of things they leave behind like sticky matter on the leaves, discolouration on the leaves, and in many cases webs. If you notice these issues you can easily apply things like pesticides to contain them or just give you a tree a very serious rinse.
This is the first thing you should look out for because you’ll easily be able to spot the culprits and if you spot them, you can rule out all other issues and treat the scale insects.
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Vine Weevils are another serious problem. If you see the signs that something has been eating the leaves off of your Magnolia but you couldn’t find any scale insects it might be vine weevils. Adult weevils actually hide in the soil around your plants and at night climb up the trunk and branches to feed. If you find yourself awake in the middle of the night you can always take a LED Torch outside and look for the culprits, catching them in the act.
If you find them or you simply suspect them but don’t want to wait around outside your house with a flashlight only to disturb your neighbours, you can use a sticky trap which you placed at the base of your tree or you can simply cover the soil with a polyspun weed barrier to prevent them from being able to access the tree itself. The sticky traps will catch them if they are the problem and you can replace them with new traps as soon as the existing ones are full.
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If you have a new magnolia tree, one that is relatively young, the Magnolia borer might be your problem. At the larval stage, this Beetle will lay its eggs in your magnolia tree trunk and when they hatch they literally bore their way into your tree and continue feeding down the trunk until they make it to the roots. You will notice the signs of this past if a particular area of your tree looks spongy and sunken. If you don’t treat them immediately they will kill a young Magnolia.
Very similarly, this type of beetle will eat the flowers of the magnolia. You’ll see round holes cut into the petals. However, they won’t eat the leaves so if you’re noticing the signs of creatures eating the leaves specifically and not the flowers, it might be something else. If you noticed that both are being consumed, you could have multiple problems on your hands.
These are tiny insects grey or white in colour with segmented bodies and they leave behind a waxy substance. Very similarly to aphids they will suck the fluid out of the tissues in the leaves and leaving its place that waxy substance which eventually leads to things like fungus. If you have a particularly heavy infestation you might notice not just believe it’s being eaten but the twigs dying. This is something you want to treat immediately with a pesticide.
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These are very small, moth like insect that has feathery wings and they eat the young flower buds and the flowers which usually causes the subsequent flower buds to fail. If you don’t get any flowers one year where you normally would this could be the culprit.
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It is in your best interest to regularly examine your tree just to make sure there aren’t any telltale signs of the leaves being eaten. Also, consider where you live and where your magnolia trees are positioned. For example, if you live on a large property with ample wildlife and your trees are not protected with any type of fencing, assuming you don’t prune your Magnolia, drooping branches and leaves can easily be eaten by many wildlife creatures including things like deer and rabbits. So, check on your plant regularly, make sure you provide optimum growing conditions and give good treatment for pests as soon as you see the signs to prevent things from getting worse. As is the case with all plant-based problems, the sooner you treat it, the better off your plant will be.
Last update on 2021-10-16 / Affiliate links / Images from Amazon Product Advertising API