Hi Sarah,

Those sound like good first steps. A few questions:

• Are all the plants you describing tomato plants? 
• What type of irrigation do you use (e.g., hose, dripline, sprinkler)? 
• What is your watering schedule like (e.g., time of day and how often)? 
• Are the plants in close proximity to each other? Are they receiving enough air circulation? 
• Did the plants start showing symptoms when we were experiencing triple digit temperatures?

It would be helpful if you could please send in some more photos from a variety of distances so that we can see more of the affected plants and their leaves.

You are also welcome to stop by with your photos and/or some samples for better identification. Master Gardeners are available Mondays, Thursdays and most Fridays from 9:00am - 1:00pm. Samples can be dropped for diagnosis Monday - Friday from 8:00am - 4:00pm. The fee is $7/plant for Boulder County residents and takes 7-10 days for results. 

Thank you for reaching out to the Boulder County Master Gardeners.

Best,
CSU Extension Boulder County Master Gardeners

Hi Sarah,

Here are some additional resources regarding tomato plants:

Recognizing Tomato Problems - 2.949 - Extension (colostate.edu)

1834 – Common Tomato Problems – PlantTalk Colorado (colostate.edu)

1442 – Tomato Diseases – PlantTalk Colorado (colostate.edu)

Best,
CSU Extension Boulder County Master Gardeners