Ask a Question
Notify Me On Question Update
Email this Question
A landscaping company planted 6 jaquemonti birch in my yard at the end of May. Two of them recently began developing darkish brown leaf spots in the center. They are getting plenty of water. On one of the leaves I found very tiny black insects. I did not find insects on any of the other leaves. What could the problem be and what should I do about it. I picked the infected leaves off that I could reach. I also collected the insects.
Rate This FAQ
From your description there may be two different things happening. The first possibility is that this particular type of tree is not heat tolerant and the leaves may be scorched because of our hot and dry weather conditions. This problem usually shows up in July and August with newly transplanted trees being the most susceptible because they have yet to develop extensive root systems. I have included a link below that has more information on leaf scorch.
The second possibility is that what you are seeing is a fungal disease. Fungal diseases usually start out as dark brown to black spots. These spots will spread and eventually grow together and in severe cases the leaves may die and fall off. When we have long periods of cool wet weather, like we did this spring, fungal diseases can be more problematic. If it is a fungal disease the good news is that now that we are having much hotter and dryer weather you should see a significant decrease in the spread of this problem. Below is a link with more information on a common fungal disease in our area. If it is fungal, some things you can do to help your tree out are to make sure to pick up and discard any of the leaves that fall off of this tree. This will help reduce the spread of the fungus. When watering the tree try to avoid getting water on the leaves. If the tree is watered by sprinklers make sure to run them early enough in the day so the leaves will be dry before nightfall. Below is a link with more information on watering trees. You can also apply a protective fungicide spray at bud break and to the newly emerging foliage next spring.
If neither of these look like what you are seeing on your trees please bring a sample into our office at 2001 S. State Street #S1200 for help with diagnosis.
Submit Your Suggestion
Other Questions In This Topic
- I have an braeburn apple tree that we got from a local nursery last fall. the leaves were slightly curled after we planted it and i thought that it was just transplant shock but this spring it has not cleared up. All the leaves are curled up on the edges.
- We live in a suburb near the mountains and have a lot of deer wandering through our neighborhood eating our flowers and vegetable gardens. They are not afraid of people and walk through our backyard any time of day. What can we spray on the garden plants to stop them from eating them?
- I have just purchased two plum trees Santa Rosa and Satsuma. I've read that they have higher water requirements than peach trees. I have two locations I am considering for these tress. I live very close to Utah Lake. The water table is very high here and the winters seem somewhat more mild because of the lower elevation and the proximity of the lake. Both locations are on the east side of the house. One is about 7 feet above the water level in our upper yard the other is 6 feet below in in the lower yard. The soil in the upper yard is mostly clean fill with lots of clay and rock but would provide shelter from harsh afternoon sun and wind. The soil in the lower yard is comprised highly of organic material. I would build a mound so that the tree would be elevated from direct contact with the water but there would still be water more easily available to the root system than in the upper yard. It would not receive shelter from the afternoon sun until much later in the afternoon/evening and would not receive much if any shelter from the wind. The main advantage in the second location is the nice soil and the proximity to moisture. I have some grapes that have done well in the more wet less sheltered second location.
- I have small white worms in my turnips and radishes. How do I deal with this problem?
- I mowed my lawn today (04/18/08) and noticed some dead "tracks" that I do not remember seeing when I mowed on Saturday (04/14/08). I thought that it might have been something from my lawn mower but it is a brand new Honda that I purchased 1 month ago. I have posted some pictures on my website and can be viewed at supersoygifts.com/grass.htm. Thanks for any info you can provide.
- I would like to prune my lilac bush. What is the best time of year to do so and how much can be cut back and not harm the bush?
- We have a scrub oak that has been growing between a pine and an aspen, which has made the oak very lop-sided. The aspen is gone now. How much purning can we do to the oak to try and even it's growth?
- I have a mature elm in my backyard that was probably planted when the house was built in the 70's. We bought it 3 years ago and I have noticed that something is eating away at the bark. There is a reddish-brown streak (almost like what you would see in a human that has blood poisoning) that runs up the bark. I cut off one of the lower limbs that the problem had progressed to. The bark is very "mushy" and looks decayed. Chunks of bark fall off at the affected areas. I cannot see any bugs that may be causing this but I suspect that is the cause. This tree has 2 main branches that extend from the bottom and this is where the main damage seems to be. I am concerned that the tree could "split" at this point if it becomes weakened. I need to know the cause and treatment.