Peach Tree Disease

Question: Can you identify the disease and treatment recommendations for my dwarf redhaven peach trees?  They are 4 years old.  They started with peach leaf curl which I always treat early with copper spray but then problems got worse due to a pest. Most of the peaches are affected but still some good looking ones still attached.

responder: An Ask Extension Expert Replied July 04, 2023, 9:55 AM EDT
response: Was there a spray applied within the last month?   The spotting on the leaves look like a chemical burn.  The puckered fruit and the spots on the fruit might be tarnished plant bug or another bug with a piercing mouthpart..   I invite you to reply with the spray program, if any.   Please give chemical, amount, and date.  Thanks.

responder: The Question Asker Replied July 07, 2023, 8:00 AM EDT
response: Thank you for your reply. I did spray the trees approximately 3weeks ago with citrus fruit and nut orchard spray by Bonide. It is for insects and fungal disease. It was mixed 4 oz to one gallon. I sprayed at the end of the day; not in the sun.    Sent from my iPhone  On Jul 4, 2023, at 9:55 AM, Ask Extension <<personal data hidden>> wrote:    ﻿

responder: An Ask Extension Expert Replied July 07, 2023, 8:47 AM EDT
response: Your spray contains sulfur which can be hard on foliage if the foliage retains large spray droplets which concentrate upon drying.  I don't know if this was indeed the cause of the leaf spots.   You are welcome to submit more pictures showing more views of the foliage, and whole tree shots.  This may help with the diagnosis.   Other factors such as low nitrogen fertility and trunk health can cause foliage decline.

responder: The Question Asker Replied July 08, 2023, 8:14 AM EDT
response: In the future do you recommend a different spray for fungal and insect problems?  I am certain that there are both problems going on.   Sent from my iPhone  On Jul 7, 2023, at 8:47 AM, Ask Extension <<personal data hidden>> wrote:    ﻿

responder: An Ask Extension Expert Replied July 10, 2023, 9:58 AM EDT
response: Here's some broad guidelines for peaches:  Peach leaf curl spray (copper or chlorothalonil) in late fall (November) or early spring (before bud break).  active ingredientlorothalonil 1 spray during the last half of bloom.  Can also use Captan.  When fruit comes out of the shuck and is greater than thumb size, start spray program every 10 days or so (wait for good spraying conditions) aimed at tarnished plant bug and plum curculio for the next approximately month  & 1/2.   Possible materials:   active ingredient Malathion, acetamiprid, pyrethrum.  After this point use pyrethrum, spinosad (example Entrust) for oriental fruit moth, captan for brown rot.  If mild temperatures you can substitute sulfur for captan.  Myclobutanil (Example: Immunox) can also be used for brown rot.  Brown rot control begins when fruit starts coloring.  Check the spray product labels to make sure peach / fruit trees are labeled and restrictions on when to apply.   Don't spray when bees are actively working the flowers.

responder: The Question Asker Replied July 11, 2023, 7:47 AM EDT
response: Thank you so much for the info. 


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