Knowledgebase

Cherry Trees #817046

Asked November 29, 2022, 4:56 PM EST

Hello dear OSU people, I'm getting in touch with you to ask a few questions about Sweet Cherry Trees. 1. How to clean away the Western Cherry Fruit Fly problem. I'm relatively new in this farm and I was told that it came around 5 years ago. Before that there was no problem with the fruit fly. I'm hopeful to find a solution for this. 2. Some trees have canker. I was recommended to use REX Lime Sulfur, I bought it but it says to apply it on the dormant season. Do I need to wait till then? How to know when a tree is dormant? 3. Some trees have a few branches that looked as if they were dead. This was visible during the summer when the leaves were green, this branches that I mention were alive but with dead like color and the leaves curly and dark. 4. How long does a sweet cheery tree lives for? 5. Do you have some general information about sweet cherry trees that I can resource from? I appreciate your help!, Victoria Chacon

Douglas County Oregon

Expert Response

Hello Victoria,

1. How to clean away the Western Cherry Fruit Fly problem. I'm
relatively new in this farm and I was told that it came around 5 years ago. Before that there was no problem with the fruit fly. I'm hopeful to find a solution for this.

>WCFF has been a problem for a long time, but what this person may be referring to is spotted wing drosophila (SWD), which is a relative newcomer that has largely replaced WCFF as the major cherry direct pest. Most growers manage SWD, which will also take care of WCFF. WCFF is easier to deal with as it responds well to bait sprays such as GF-120.


2. Some trees have canker. I was recommended to use REX Lime Sulfur, I bought it but it says to apply it on the dormant season. Do I need to wait till then? How to know when a tree is dormant?

>Generally yes you can damage leaves with sulfur applied during the growing season. The tree is dormant when it has lost its leaves during winter. Another timing for certain sprays is delayed-dormant timing, which is the time when the buds begin to swell in early spring. Any pest/disease management guide will give you a key to the important tree stages.  For bacterial canker on cherry in the Willamette Valley you might be better off with delayed dormant application of the lime sulfur. But, this is a really tough disease to manage with sprays on cherry, see: https://pnwhandbooks.org/plantdisease/host-disease/cherry-prunus-spp-bacterial-canker

3. Some trees have a few branches that looked as if they were dead. This was visible during the summer when the leaves were green, this branches that I mention were alive but with dead like color and the leaves curly and dark.

>Prune this dead stuff out in dry weather. It is fine to do it in the growing season, in fact summer pruning can reduce transmission of bacterial canker and promote good healing response. 

4. How long does a sweet cheery tree lives for?

>Well the productive life is probably around 20 years, but they can live much longer. Over time, production declines as disease such as bacterial canker increase. So at a certain point the cost of maintaining the trees eclipses the profits made and it is best to rip out the orchard and renew it.

5. Do you have some general information about sweet cherry trees that I can resource from?

Yes here are all the cherry resources from the OSU Extension catalog. See also the PNW Insect and Disease handbooks (referenced above) that have additional resources:

https://catalog.extension.oregonstate.edu/search/content/cherry
Nik Wiman Replied November 29, 2022, 6:45 PM EST
Thanks so much for the information.
I´ll check the links you provided.

Victoria

“This sky where we live is no place to lose your wings so love, love, love.”   - Hafiz

From: askextension=eduworks.com@mg.eduworks.com <askextension=eduworks.com@mg.eduworks.com> on behalf of Ask Extension <askextension@eduworks.com>
Sent: Tuesday, November 29, 2022 5:45 PM
To: Victoria Chacon <vico.chacon@hotmail.com>
Subject: Re: Cherry Trees (#0086975)
 
The Question Asker Replied November 30, 2022, 7:38 PM EST

Hello,

I have a few more questions regarding cherry trees... 

You recommended to use GF-120 for SWD, would this also works for controlling WCFF? Regardless of this, can you tell me when and how to apply this product please. If this doesn't work for WCFF, what other organic option can work?

Someone from the extension recommended to use REX Lime Sulfur for canker in cherry trees. When and how to apply it? 

Thanks,

Victoria

The Question Asker Replied December 12, 2022, 4:13 PM EST
Hi Victoria, No I recommend GF-120 only for WCFF, it doesn't work for SWD, only for WCFF. If you are targeting SWD the main organic option will be spinosad in a product called Entrust. It must be applied as cherries begin to ripen. If you are targeting WCFF the timing for GF-120 is after the flies emerge. You can use a degree day model to estimate emergence or place traps in your orchard.

More details are available in the Cherry PMG for the Willamette Valley: https://catalog.extension.oregonstate.edu/sites/catalog/files/project/pdf/em8329.pdf

Bacterial canker in cherry is very challenging. If you read the disease management chapter I linked in my first reply, the chemical controls are not very effective. Specifically for lime sulfur it gives the following recommendation:

  • Rex Lime Sulfur Solution (28%) at 6 to 12 gal/100 gal water delayed dormant may have some utility. 48-hr reentry.
Nik Wiman Replied December 12, 2022, 4:37 PM EST
Thanks, I appreciate your help! 

How to know the type of cherry fruit fly that is around here? I'm new in the area and just getting familiar with the orchard and environment. I visited a few years ago when the cherries were ripe and noticed they had some type of small worm inside. 

Regarding the bacterial canker, I read the article... since I bought the Rex Lime Sulfur I think I'll try it on young cherry trees. There's many of the old trees that have a small cut with gummosis and maybe I'l try on those as well. Do I need to spray the whole tree or only the affected area? What does 48-hr reentry means? 


Victoria



“This sky where we live is no place to lose your wings so love, love, love.”   - Hafiz

From: askextension=eduworks.com@mg.eduworks.com <askextension=eduworks.com@mg.eduworks.com> on behalf of Ask Extension <askextension@eduworks.com>
Sent: Monday, December 12, 2022 3:37 PM
To: Victoria Chacon <vico.chacon@hotmail.com>
Subject: Re: Cherry Trees (#0086975)
 
The Question Asker Replied December 18, 2022, 12:24 PM EST
Hi Victoria,

I'm not sure where you are located. However, I think SWD will be the main concern as this is the case for cherry growers throughout the PNW. If you manage SWD, you likely will not need to worry about WCFF. Yes you would spray whole trees. I would recommend that you obtain a pesticide license, please see: https://www.oregon.gov/ODA/programs/Pesticides/Licensing/Pages/PesticideLicensing.aspx

You will learn how to interpret pesticide labels through the license training including concepts such as REI. REI refers to "restricted entry interval", and is the legally mandated time that entry into the orchard is prohibited after a pesticide application. Even though you may be handing organic products, they are still hazardous to handle and apply. Lime sulfur in particular is highly caustic so please use caution.
Nik Wiman Replied December 19, 2022, 1:33 PM EST
Thanks so much!

“This sky where we live is no place to lose your wings so love, love, love.”   - Hafiz

From: askextension=eduworks.com@mg.eduworks.com <askextension=eduworks.com@mg.eduworks.com> on behalf of Ask Extension <askextension@eduworks.com>
Sent: Monday, December 19, 2022 12:33 PM
To: Victoria Chacon <vico.chacon@hotmail.com>
Subject: Re: Cherry Trees (#0086975)
 
The Question Asker Replied December 20, 2022, 11:53 AM EST

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