spots on plum tree leaves - Ask Extension
attached are 2 pix of leaf spots on a santa rosa plum tree in its 3rd spring. the leaves look fine as they emerge, but now have these spots. I live ...
Knowledgebase
spots on plum tree leaves #622173
Asked April 08, 2020, 10:06 AM EDT
attached are 2 pix of leaf spots on a santa rosa plum tree in its 3rd spring. the leaves look fine as they emerge, but now have these spots. I live on a hillside in western baltimore county. the tree receives full sunlight until 5 or 6 in the afternoon. I have sprayed with a spectral fruit tree spray about 3 weeks ago and again on April 6th.
any ideas on what it is and how I can treat it?
thank you for your assistance.
Baltimore County Maryland
Expert Response
The only foliar disease on fruit trees that could show symptoms this early in the season is Peach Leaf Curl (and a related disease on plums). This does not appear to be that disease, and instead looks like damage from a spray itself. This is a list of common fruit diseases in our area:
https://extension.umd.edu/hgic/topics/diseases-stone-fruit. Spray damage is referred to as phytotoxicity: https://extension.umd.edu/hgic/topics/phytotoxicity.
What pest or disease are you treating the plum for? Prevention is key to controlling diseases before they progress, but making sure the right remedy is being used for the right disease is important. We don't know what product you are referring to that was used; can you tell us its active ingredients? Did the label give guidelines as to when to spray (in terms of weather conditions)?
Miri
https://extension.umd.edu/hgic/topics/diseases-stone-fruit. Spray damage is referred to as phytotoxicity: https://extension.umd.edu/hgic/topics/phytotoxicity.
What pest or disease are you treating the plum for? Prevention is key to controlling diseases before they progress, but making sure the right remedy is being used for the right disease is important. We don't know what product you are referring to that was used; can you tell us its active ingredients? Did the label give guidelines as to when to spray (in terms of weather conditions)?
Miri
