A tree’s bark, leaves, and overall appearance are some of the first indicators of sickness that you can recognize, but sometimes it can be hard to tell whether something is actually wrong with your tree or not. There are quite a few factors that affect the condition of your trees, making it easy to mistake normal seasonal changes for signs of illness.
If you’re worried about your tree’s health, don’t worry; our guide on sick tree symptoms will help you determine whether your tree needs some attention or if you should just sit back and enjoy it during the fall season!
How do I know if my tree is sick?
Unfortunately, there are no telltale signs that you can use to definitively say whether or not your tree is healthy. However, there are indicators you can look for to determine if your tree might be sick. The easiest way to check is with a physical inspection. Look at how green your leaves are and how thick they are. Next, look at the tree’s canopy; does it appear soggy?
Finally, take a sniff – does it smell like chemicals? If you’re worried about potential tree problems and want advice on what to do next, consider calling in an arborist. In many cases, they’ll help diagnose specific ailments and recommend steps of action accordingly. Just don’t forget: trees grow over time and seasons change as well—even if your tree is sick now doesn’t mean it will always be sick!
If your tree has yellow needles.
If your pine tree has yellow needles, it could mean two things: it’s getting older or something’s wrong. Aging naturally leads to yellowing leaves, so if you think your evergreen isn’t ailing, but just aging, be sure to check out our post on caring for aging trees.
However, if you want to get down to the symptoms of diseased pine trees specifically, read on! Healthy pine needles are dark green and stay firm, though they can droop as they grow longer. When new needles emerge in spring, they should be smooth and velvety—not crinkly or sticky to the touch.
The upper surface of each needle should face forward instead of having a kink at its base. Needles that don’t meet these criteria are likely, not healthy, and if you spot any discoloration or small holes in them, there may very well be something seriously wrong with your tree.
If your leaves curl or turn brown.
If your leaves curl or turn brown, you may have an iron deficiency in your soil. You can solve this problem by giving your plant additional iron in its water supply; for example, use iron-rich fertilizers and aerate your plants' soil to allow more oxygen to enter it.
Both of these solutions can help stimulate chlorophyll production and give your tree back its green coloring. If you see brown or dark spots on your leaves, that could be a sign of spider mites or fungal infection, which require different types of treatment than iron deficiency.
Other issues you should pay attention to
Depending on what kind of tree you have, there are other issues you might encounter. Some telltale signs that your tree isn’t healthy to include: not growing as it should (or at all), abnormally long witches broom branches, dead branches or another apparent dieback, brown leaves or those with holes in them, and fungus growths.
If any of these are evident, your arborist can help determine whether your plant needs to be removed—not necessarily because it’s dying but because it has passed its prime and may present hazards if left standing.
What can you do to treat a sick tree?
There are many steps you can take to treat a sick tree, depending on what it’s suffering from. According to Arborist Jym Ganem, who has treated trees for more than three decades and runs Sunbelt Arboriculture in California, here are four common causes of illness: soil-borne pathogens such as root rot (you may see white roots), trunk decay (discoloration of bark at base or cracks in bark), cankers (usually from disease but possibly from wounds) and insects.
In order to treat these ailments, it’s helpful to understand how they affect trees. For example, if an elm's leaves are turning yellow because of leaf rust, you'd want to make sure your fertilization program does not contain nitrogen.
How often should you take care of your trees?
Whether you own a large landscaping business or have just one backyard tree, there’s no reason to wait for a disaster before you start taking care of your trees. Taking preventative measures now can save you tons of time and money in years to come.
Because it’s not always easy to determine what’s causing certain symptoms, here are some clear signs that your trees need help right away:
1. Brown leaves/yellowing: This is probably one of the most common signs of trouble; if all your leaves are turning yellow, it could be due to several factors.
2. Dry/cracked bark: When you see cracks in tree bark, it’s often an indication that they need more water—don't ignore these warning signs
3. Inverted growth (when new branches turn upwards): If you see new shoots on your branches going up instead of down, your plant isn't receiving enough nutrients and may soon die without intervention.