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#0120328 nectarine rot #851281

Asked September 26, 2023, 12:19 PM EDT

I haven't heard from you so I'm resending this. Here is my reply to your 9/20 email that I received from you. There are 3 photos attached. There were only 3 nectarines left on the tree. The photos are of one that shows some rot. It was very hard to split it to see the inside. Note there are a few "splits", and the rot seems to be spreading from the splits, but that was not necessarily the case on all of them. Are the splits the result of watering or lack thereof? There was no evidence of bugs that I could see, although I have found an occasional earwig on some fruits. Also, the rot has not penetrated to the seed, but I have noticed that on others that I have picked, but I don't know if the rot started inside or out. I did salvage parts of some that were ripe on a few. I did notice that some of the seeds were split or cracked when I exposed them. Also, early in the spring as the fruit was large enough, I put small drawstring fine mesh jewelry sacks on the fruits to protect them from birds and insects as they grew. I had good luck doing that in the past, with only a few that rotted. I did reuse the bags this year after soaking in a light bleach solution. There are 2 large nectarines left on the tree, one in a sack and one not and neither show any signs of rot. I'm checking them every day. Thanks! Kent Hall Bandon

Coos County Oregon

Expert Response

Splits on nectarines can be due to a variety of reasons:
 - Nutritional deficiencies - calcium, magnesium, and boron deficiency can cause cracking in fruit.
 - Irregular watering can cause splits as it can encourage growth spurts that split the skin.
 - Hot weather can induce rapid growth thatch split skins

Once the skin is split, it becomes more susceptible to bacteria and fungi that can cause rotting.

The split pit is a physiological problem with an unknown exact cause.  Rot can definitely occur when the pit splits.  Here is some information from the Pacific Northwest Plant Disease Management Handbook - https://pnwhandbooks.org/plantdisease/host-disease/peach-prunus-persica-split-pit

They're also a possibility that earwigs might have made a snack of your nectarines.  Their chewing damage also opens up the fruit skin and makes it very susceptible to fungal/bacterial infection. Here's some information from the UC Davis Integrated Pest management site - https://ipm.ucanr.edu/PMG/PESTNOTES/pn74102.html
Bill Hutmacher Replied September 28, 2023, 5:47 PM EDT
Thanks for all the helpful information.
Kent

From: ask=<personal data hidden> <ask=<personal data hidden>> on behalf of Ask Extension <<personal data hidden>>
Sent: Thursday, September 28, 2023 2:47 PM
To: bevandkent <<personal data hidden>>
Subject: Re: #0120328 nectarine rot (#0121207)
 
The Question Asker Replied November 02, 2023, 1:12 PM EDT
You're welcome
Bill Hutmacher Replied November 02, 2023, 6:18 PM EDT

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