Looks like it could be residue from Surround. I never used it but in your image it just looks like residue from dried liquid solution of some sort. Maybe a water droplet with some Surround or other spray content formed and dropped down and made a splash on those leaves you showed.
Thanks for your reply. I’m actually concerned about black leaf curl. I did some search and found this post which points to Bacterial blight caused by Pseudomonas syringae. Black leaf curl on new pear tree - Ask Extension
Hi @ukie , I have seen ocassional similar leaves in my pears trees. I personally attribute it to frost damage, or some other sort of damage done to the leaf while it was very small and tender. I believe damage done to the leaf while it was smaller would make the mature leave deformed as such.
I think as long as new leaves are not deformed, your tree would be fine.
1 Like
Good sleuthing. I noticed these two points in the article:
- pear are so sensitive to a variety of problems
- you may want to consider sending a sample to the Utah Plant Pest Diagnostic Lab
… or a lab in your state.
It’s the first time I encounter this disease on my pear trees. One side of the trees is looking healthy, the other half of the trees doesn’t.
Who knows what disease is this and what are the best chemicals suited to overcome this problem?
1 Like
Was there glysophate or other herbicide like it used near the trees? Sometimes lawn chemicals etc. are applied. Do you have voles or other underground pests?
2 Likes
I don’t think any herbicide was used nearby. I don’t see any vole activity in my yard.
1 Like
Normally when i see something like that i would say start with a good inspection of the area. Sometimes after a long winter i may have an apple half dead or with deformed leaves. Usually voles spent the winter eating my apple roots underground. 9 times out of 10 the problem started in the roots. Sometimes as a tree ages it can lose vigor but thats a pear which are known to live very long. A friends wife sprayed his tomatoes with a weak roundup solution because the sprayers got mixed up and she was helping him out. When he got home he sprayed them all down with water quickly before the roundup dried. They lived after going through a difficult time and produced gigantic tomatoes. I’m not sure he should have ate them but he did. The point im making is glysophate will impact leaves first on anything.
1 Like
100% agree that pears are probably the most “livable” trees out there.
I’ll try and spray it with Topsin M fungicide and see if it will help.
Some years ago I had same problem with one young apple tree - every year it started off like that and only gave normal leaves second half of summer. I ecentually removed it.
1 Like
Keep in mind certain wilts and other soil born pathogens exist. I’m not suggesting wilt in your case because it does not look like that Verticillium Wilt of Shade Trees | USU. Could there be something similar in your area im not familiar with a local agency might be aware of? As an example there are pests in some areas like pear blister leaf mites that cause leaves to curl but your leaves show no red blotches Pear tree - red splotchy, curled leaves - Ask Extension. When my pears look like that they need water. Have another idea that is unlikely which is midges The mystery of the curling pear leaves - Planters Place.
2 Likes
Thank you for this info Clark.
I’ll have to prune some shoots and and take a closer look
1 Like
If its verticillium, I’ll definitely take measures.
1 Like
Your welcome! No i dont think it is wilt but i do think there is something going on with the roots. Had a friend once that had wood ants hollow out his tree. He said he would have never found it had i not said inspect it closely. The only thing left was the outer cambium they ate the inside of the tree. He was inspecting around the roots and found out the tree was hollow. There was a hole i guess. See the root issue here as well Leaf curl on my new Bartlett Pear
1 Like
My European pears have some disease. Any of you know what’s wrong with them and the treatment please? Thank you in advance for all advices.
It looks like a rust. Myclobutanil spray may help. I had it once in my pear tree. I spray immunox every year to prevent it happens
2 Likes
Vincent,
That is pear rust. Once the tree is affected, nothing much you can do. If you want to, you could spray it with fungicide like myclobutanil (one of the brand names is Immunox by Spectracide).
Next year, spray myclobutanil right after petal fall (after pear flowers dropped petals) once. If your area is quite rainy/wet, you can spray it again about 10-14 days later.
You should add sticker into the tank mix so the chemical stay on the leaves longer. Sticker like Bonide Turbo is easy to find and come in a small bottle.
4 Likes
@mamuang @IL847 thank you both of you so much. Anyway I just bought copper spray for my little Peach trees next year. Do you think can I use copper on the pear trees as well instead buy some more spray?
Copper is not effective against rust. You need fungicide like myclobunatil or fenbuconazole.
Also, not sure what copper you bought. Be careful spraying copper when trees leaf out. Copper can cause leaf burn. Please check the label for the time and amount to use.
1 Like
@mamuang do you think if I spray chemicals for pear rust then have to repeat spray every single year? Below picture of my copper. Thank you Tipp.
That copper, copper octanoate, won’t help with pear rust.
You pear appears to be susceptible to pear rust. As long as you have host trees such as junipers around, it is likely you will have pear rust yearly.
It is not easy to remove all host trees but you can try. Here is the info on how pear rust occurs.
2 Likes