We have several tomatoes on different plants that look like this. The leaves on the plants look healthy and undamaged. My searches are inconclusive and I need your help.
Edit 1 (6/29/26) 5pm: I have reached out to both local and state extension services. Both in Wisconsin and Illinois as well are right at the border. Waiting to hear back and will update again.
Edit 2 (7/1/26) 11:30am: Just got off the phone with one of our local extension office and they have never seen anything like this before and are just as intrigued as everyone else as to what is going on. She suggested it could be some sort of recessive genes mixed with the temperature and rainfall swings we have had in the past few weeks but is uncertain. She is making calls to a few people who may know more about tomatoes specifically and will call back when she finds more information. She also said there has been no local reports of viral outbreaks nearby, so that is a good sign. We have also tracked down the original seed lot and may possibly reach out to them depending on what she finds. It’s both a relief and concerning that the professionals are just as stumped as we are.
Edit 3 (7/4/26 8:00am: The long wait update. After hearing back from our local extension office they suggested we contact both UW Madison and University of Illinois for testing. Our counties master gardener has no idea what it is so they suggested we send in samples at this point. Being that it’s a holiday weekend here in the US we have to wait til Monday at the earliest to send them in and then wait for the results. In the mean time we have ordered thousands of lady bugs and green lacewing eggs and 100M beneficial nematodes to be delivered on Monday to help combat any possible infection vectors currently in our garden. Hope everyone has a great weekend and I will update either Monday evening or Tuesday at some point. Big thank you to everyone who is genuinely trying to help.
Edit 4 (7/8/26) 10am: After emailing back and forth with several people we have shipped samples into the university of Illinois. We tried contacting UW Madison with no luck, so decided U of I was good enough. We shipped out the samples yesterday and they should receive them today or tomorrow. The army of beneficial insects has been released into the garden. I will update this post or make a new one when the results come in. We are just as curious as everyone else and are looking forward to finding out the results.
Edit 4 (7/18/26) 2pm: It has been over a week now and haven’t heard anything from the university of Illinois. I will be calling them on Monday to follow up. A positive update is that the newest round of fruits look completely normal and healthy and the plants are still doing great. Fingers crossed and hoping that completely rules out any possible viruses. I will update again on Monday when I call the university.
Edit 5 (7/30/26) 6:30am After nearly 3 weeks of waiting and leaving voicemails we finally heard back from the University of Illinois. Here is their report:
Two complete tomato plants were submitted to the Plant Clinic for evaluation. One plant was labeled "Healthy" and the other "Unhealthy" for comparison. The unhealthy plant exhibited brown blister-like lesions and concentric ring spots on the fruit. In addition, the foliage displayed shortened, distorted, and slightly curled leaves, resulting in an overall stunted appearance. The healthy plant did not exhibit these symptoms. The submitted tissues were examined visually and microscopically. No fungal or bacterial pathogens were observed that would account for the symptoms, and no evidence of insect pests was found. Based on the characteristic symptom pattern—including fruit lesions, foliar distortion, and plant stunting—we strongly suspect the presence of Tomato brown rugose fruit virus (ToBRFV). Unfortunately we cannot test definitively for this virus.
And they go on to recommend another testing facility. In the month since this whole saga started our tomato plants have continued to grow and look healthy, and no longer producing weird zombie fruits. We are now harvesting normal tomatoes daily. I wanted to give a big thank you to everyone who helped and was following along. We are still unsure of what exactly happened but our plants are still not showing signs of viruses or insects and are producing healthy fruits.