Hi Marty,

Thank you for reaching out to us at the UNH Extension Infoline regarding your tomatoes.

It is tricky to be 100% sure what the one cause is for the yellowing leaves/curling, but it is possible this may be related to blight or yellow leaf curl. I am going to share a few resources with you below for possibilities and also our plant diagnostic lab. You can submit leaf samples directly to the lab to get 100% accurate results.

Resources:
https://extension.unh.edu/blog/2019/05/tomato-troubles-cultural-practices-combat-insects-diseases
https://extension.unh.edu/resource/growing-vegetables-tomatoes-fact-sheet-1#:~:text=Septoria%20leaf%20spot%2C%20Early%20blight,all%20fungal%20diseases%20of%20tomato.
https://extension.unh.edu/blog/2018/07/how-can-i-keep-my-tomatoes-getting-leaf-spots
https://hgic.clemson.edu/factsheet/tomato-leaves-rolling/

Here is the link for the UNH Plant Diagnostic Lab homepage, which has the address to send the sample to, as well as information on best practices for submitting a plant sample and other resources: Plant Diagnostic Lab Homepage

And here is the link to the submission form to submit a plant diagnostic sample: UNH Plant Diagnostic Lab

Common Insects and diseases for tomatoes: 
https://extension.umn.edu/plant-diseases/insects-and-diseases-tomatoes

If you have any photos with close ups of the leaves/tomatoes that are damaged by possible pest/insects, that would be extremely helpful for further IDing + research!

Please click here: https://bit.ly/3L6PZy1 to complete our brief demographic survey.

This survey is completely anonymous and the demographic questions are optional. If you choose not to participate, please answer “prefer not to respond”. It is important to the university and our organization that we are reaching a diversity of audiences in our state. Your input is critical for our continued success to support and protect both New Hampshire's people and the environment. Thank you for your time!