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Squash & cucumbers #872777

Asked June 12, 2024, 10:55 AM EDT

I have pumpkin, zucchini and cucumbers that have some yellow spots on them and I was just curious what you think might be the cause? I have attached images.

Jackson County Oregon

Expert Response

Angular leaf spot is a bacterial disease that can affect cucumber leaves and fruit, caused by the bacterium *Pseudomonas syringae pv. lachrymans*. It's also known as bacterial leaf spot of cucurbits. Resistant cucumber varieties are available. Limit the use of overhead irrigation. Pick fruit when the vines are dry to prevent spread in the field. Use pathogen-free seed and rotate out of cucurbits. Treat when symptoms first appear if the weather is predicted to be cool and rainy.

https://plantclinic.nmsu.edu/documents/bacterial-leaf-spot-of-cucurbits.pdf

Chris Rusch Replied June 13, 2024, 1:18 AM EDT

Angular leaf spot is a bacterial disease that can affect cucumber leaves and fruit, caused by the bacterium *Pseudomonas syringae pv. lachrymans*. It's also known as bacterial leaf spot of cucurbits. Resistant cucumber varieties are available. Limit the use of overhead irrigation. Pick fruit when the vines are dry to prevent spread in the field. Use pathogen-free seed and rotate out of cucurbits. Treat when symptoms first appear if the weather is predicted to be cool and rainy.
https://plantclinic.nmsu.edu/documents/bacterial-leaf-spot-of-cucurbits.pdf

Chris Rusch Replied June 13, 2024, 11:46 PM EDT

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This work is supported in part by New Technologies for Ag Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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