Szia Albi! Szerintem kabócák által tojásrakás során készített hasítékok. Meg kell nézni a sebeket óvatosan felnyitva, felboncolva mikroszkóp alatt, bújnak-e meg bennük tojások. Szólj, ha találtok!

Szerinem valamelyik Diplodia gombafaj, az utobbi idoben sok faiskolas panaszkodott ra.

Szia Gabor

Megneztuk, de nincsenek tojasok, amugy nagyon gyakori a fiatal fakon, Diplodiara gyanakszom en is (Ata is irta) de jo lenne pontosabban meghatarozni, vannak helyek ahol szinta 100%-os a jelenlete a fiatal fakon. Allitolag dion is van, en nem lattam csak mondtak. ha tudtok reszleteket szivesen veszem.

Koszi

Albi

Szia Albi! Annak idején (pár éve) nagyon hasonló mintát hoztak be hozzánk Újfehértóról, almáról, és az kabóca volt, bár nem volt könnyű megtalálni a pici tojásokat még mikroszkóp alatt sem. Ha esetleg valamikor erre jártok pár gallyal, szívesen megnézem. Üdv., Gábor

Dear Adalbert,

At first look that damage remind me to Stictocephala bisonia Kopp & Yonke. Maybe other colleagues say the same, but conversation was on Hungarian.

Kind regards,

Predrag

Dear Predrag

They says that it might be injuries made by some Cicada species to lay eggs or Diplodia fungus. We did not see any eggs while injuries are frequent on young apple trees.

Thanks

Best

Adalbert

They probably better know, I'm not a expert for this topic. It just my memories from base studies.

Cheers,

Predrag

Could it be manganese toxicity? how is the soil pH?

No, the soil pH is OK, we found these around a long distances too.

Adalbert

Dear  Adalbert,

This is  very  typical  damage of  young  apple trees by   Cicada species, for instance - Stictocephala bubalus  (bisonia) when they  lay eggs  early spring. it damages   the skin of young shoots and when shoots  grown  it starting to cracking  - it looks like  hail damage, but it is no  hail, no diseases....This is cicada

Basically these  insects damage mainly  apple seedlings and  the new  trees, when In orchards are   not proper control of weeds, especially excessive growth of weeds.   No weeds no cicadas,  no cicadas not this type of damage...

In next   early spring will be  benefit application of mineral oils + insecticides...

Dear Colleagues

Gabor and Zviadi has right, this is Stictocephala bubalus.

We found eggs in damaged plants.

Thanks again

Best

Adalbert Balog

Thank you, Balog..

Good luck...

Zviadi

.

@ Zviadi and Balog,

I am not an expert on this, but why:

1. "No weed, no cicada", as Zviadi stated?

2. Is this the only pest can 'lay eggs' under young apple tree skin? Why are we so sure it is from cicada? Is it because the size or shape of the eggs?

Dear Yuan-Yeu Yau,

Thank you for  questions.

1. "No weeds no cicadas" is means that Buffalo treehopper  likes  for  leaving long grasses or weeds, bushes, forest trees   which is around  of orchard. 

if in  the  orchard  weeds are  properly controlled  - very few  evidences of this damage  is occur, opposite side - when   young orchard is not controlled against  weeds - no way not have damage by buffalo treehopper. 

Extremely it  is important in Fruit tree nurseries, where Buffalo treehopper  can devastate and drastically decrease quality of trees.  I have personal experience on this direction within of my  long period of activities of fruit tree propagation. 

2. This type of  tree damages is detailed describes  in  almost all  Entomological books  which is  dedicated for  fruit crops.  

Have a nice Day,

Best regards,

Zviadi

Hi Zviadi,

Thanks for the explanation.

I remember when I was a little boy, I saw a lot of cicadas on the trees singing. This kind of big cicadas (see picture #1). I did not know Buffalo treehopper cicada (see attached picture #2). Now I know. It is an interesting discussion, and thank you for your inputs.

Dear Balog:

In my opinion it is a a canker apple trees which is a disease caused by a fungus, Neonectria ditissima, which attacks the bark of apples.

You can see the same symptoms in the attached photo whith canker apple.

I hope this information will help you.

Best regards,

Mario

I presume zonate canker caused by Nectria gallligena. Other pictures for pathological manifestation duriong the last vegetation wiil help the diagnosis. Mixed infection with participation of bacteria is also possible.

I did not see the damaged tree in live. After a picture I can say only my ideas.. The American buffalo treehopper (Stictocephala bosonia) can cause this damage on the young trees. (Fruit trees and the nursery in forest). In the last years we have seen damages of St. bisonia fruigrowing and in viticulture as well. The spread of this ivasive (in Europe) insect is expanded in the North part of Eurpoe (Germany, Poland!). Sorry for my "bad" English!