Cucumber disease - Ask Extension
Could you please identify this fungus or disease on my cucumber? It is spreading to all the leaves.
Knowledgebase
Cucumber disease #879491
Asked July 30, 2024, 7:51 PM EDT
Could you please identify this fungus or disease on my cucumber? It is spreading to all the leaves.
Benton County Oregon
Expert Response
Thanks for contacting "Ask Extension" with your question about your cucumber plant. There are several fungi and bacteria that could cause the damage shown in the picture. Possibilities include angular leaf spot, alternaria leaf spot and anthracnose.
Below are recommended management options.
For a fee, you can submit a sample to the OSU Plant-clinic for fungal or bacterial ID. https://bpp.oregonstate.edu/plant-clinic
Hope this helps!
Below are recommended management options.
- Rotate crops. Do not plant cucumber or related crops in the same location for at least two years.
- Plant resistant varieties. (Link to disease resistant cucurbit varieties)
- Avoid overhead watering.
- Avoid crowding plants too closely.
- Clean up and dispose of symptomatic leaves and stems.
- Wash with soap and water after handling plants. Do not handle healthy plants after working with infected plants. Do not handle wet plants.
For a fee, you can submit a sample to the OSU Plant-clinic for fungal or bacterial ID. https://bpp.oregonstate.edu/plant-clinic
Hope this helps!
Hi Deb,
Thanks for your reply to my question. There wasn’t anything planted where the cucumber is for at least two years, and I planted one of the resistant varieties, “Summer Dance”. I’ve removed some of the leaves but don’t want to take too many off as the plant is still producing. The fruit looks fine.
I’ll try a different location for this next year. It doesn’t seem to have spread to any other vegetables.
Debra
Sent from my iPhone
Sent from my iPhone
On Aug 1, 2024, at 8:55 AM, Ask Extension <<personal data hidden>> wrote:
According to WSU, Alternaria Leaf Spot doesn't usually spread to fruit in the PNW. It sounds like that may be what you have. In that case it's ok to leave the leaves on the plant until harvest.
Thanks for the info- I’ll look into Alternaria Lead Spot.
