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Birch

Birch, branches with white patches

Hello,

Many thin branches of 2 young birch trees are covered with a kind of white crust (see picture). Are they scale insects, or something else? How can I control them?

Thanks.

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   este-acesta-paduchele-testos-pe-ramurile-unui-mesteacan-213296.jpeg
   

#200518

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Hello. For identification purposes, please attach several clear photos, focused on the patches/deposits observed. Furthermore, please describe the observed deposits in as much detail as possible: if they have wings, if you observe them moving, if they can be easily removed with a damp cloth or fingernail, if they can be easily crushed between the fingers, if they release a blood-like substance when crushed or any other information that may be relevant in this case. Also, in order to be able to help you with more advice, please describe the environmental and care conditions offered to the birch trees and attach photos of them as a whole.

#200531

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Thanks for the preliminary answer.

I would say that overall the birch trees have more problems:

1. Those white deposits on the branches. They are stiff to the touch. When pressed, they keep their shape. They’re hard. They scrape off with some difficulty with the fingernail and a gritty substance results, which to the touch is like fine sand. The closest comparison would be with tiny, calcified eggs.

2. In the last year they have grown very little compared to the first. They are now in their 3rd year since planting.

3. They have some marks on their trunks. I’ve probably hit them with a lawnmower over the years, but still the actual markings don’t seem to be from that. I mean they seem more severe.

4. That’s not a health issue, but they don’t have white bark – at first I thought maybe the young plants had brown bark, but they’re already entering their 3rd year after planting and look like you see them. They are bought off the internet, a mistake I won’t make again.

First I’d like to know what these deposits are – especially if they could spread to other plants in the yard. Then, overall, I guess I’d also like some advice regarding their general condition. Their look isn’t great, the yard is small, and I’d prefer to have some healthy, beautiful plants in this part of the yard.

Thanks.

Attachments:

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   mesteacan-ramuri-cu-crusta-alba-paduchele-testos-214419.jpeg
   

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   mesteacan-ramuri-cu-crusta-alba-paduchele-testos-214419-1.jpeg
   

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   mesteacan-ramuri-cu-crusta-alba-paduchele-testos-214419-2.jpeg
   

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   mesteacan-ramuri-cu-crusta-alba-paduchele-testos-214419.jpg
   

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#200526

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I attach 2 additional photos of the deposits on the branches.

Attachments:

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   mesteacan-ramuri-cu-crusta-alba-paduchele-testos-214424.jpg
   

2. 

   mesteacan-ramuri-cu-crusta-alba-paduchele-testos-214424-1.jpg
   

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#200523

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Hello. The plants in the pictures are most likely specimens of Betula glandulosa (American dwarf birch), and the white patches are normal for this species, and are called resin glands. As for the affected areas on the trunk, they are very similar to Nectria canker (Nectria galligena), which is caused by fungi of the genus Nectria sp. Most commonly, this type of canker occurs through the infection of an existing wound on the plant, especially in damp conditions. However, for accurate identification, a laboratory analysis is required.
In this case, it is recommended to clean the affected areas (with a clean, disinfected tool) until healthy wood is observed. Then apply a copper-containing solution, such as Bouillie Bordelaise WDG, 50 g, to the wounds. One sachet of Bouillie Bordelaise WDG, 50 g is dissolved in a small amount of water to form a paste. After the solution has dried, you can consider applying a product that promotes wound healing and prevents the penetration of moisture that can lead to the onset of specific diseases (Bio Plantella Arbosan, 350 g or Tree plaster, 300 g).
In the future, a special solution such as Protekt Bio Plantella, 1.5 kg can be used to protect the bark.
Also, to stimulate the overcoming of the stress period, you can consider the use of a fertilizer with the effect of improving the quality of the soil, i.e. revitalizing the roots and supporting growth, such as Tree Shrubs, 1 litre, by watering at the roots, according to the instructions in the product description. More advice on the environmental conditions and care of birch trees can be found in our article in the Armuro Community: Birch, planting guide and care work.

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Recommended articles

Birch, planting guide and care work

Birch, information about environmental conditions and watering, pruning, propagation, fertilization, planting, from Armuro.

#200522

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Extraordinary answer! Thank you, I appreciate all the details provided!

Very interesting and this species of birch… not at all what I wanted, but… maybe I’ll keep them, if I manage to revive them. The wounds at the base of the trunk look pretty ugly and deep to me. I already have Bio Plantella Arbosan, 350 g. Can I use it after I clean the wounds? In the case of the deep ones (3rd picture), do I clean them first? They look closed. And even after the treatment, will the trees still recover and feed properly?

#200521

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The application of Bio Plantella Arbosan, 350 g is recommended after brushing the wounds with a copper paste (after drying). Considering the aspect of the wounds on the lower part of the trunk, it is recommended to clean them before applying the products. The cleaning of the wounds can be done little by little until the wood remains clean. Only on the basis of the photographs and those mentioned above it is not possible to determine the exact evolution of the birch trees in the future, as this depends on several internal and external factors (physiological processes of the plants, climatic conditions, care conditions, etc.).

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#200520

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