Herbicides such as 2,4-D have a strong smell and can be easily detected when used. It has growth regulator-type activity and affected plants will show curling and twisting before they die. Non-lethal doses to tomatoes will cause curling and darkening or lightening of the leaves and potentially reduce yields depending on exposure level. If the exposure was bad, the plant will eventually die.
Below are more pictures of damage caused by hervicides.
9-1-1 for Affected Plants
Unfortunately, we may be able to control what we spray in our yards but not so much what is sprayed in the neighbor’s yard or fields. Or by their lawn service. Since a foliar method is used for application, this increases the chances of drift. Lately in our area, it has been quite windy, more so than usual. I’ve had a handful of people contact me about this.
Symptoms include twisted, curling leaves, and yellowing etc. It happens quite suddenly and there is little we can do about it except deeply water the suspected victim throughly and deeply (to dilute the chemicals.) and try and wash it off the foliage as much and as soon as possible.
Plants accidentally exposed should have affected leaves pruned off to prevent the spread ofthe herbicide deep into the plant.
Our neighbor uses a lawn service and we have told them the employees that we have a garden and about 10,000 plants that don’t take well to drift from their sprays and they have been very good about remembering that.
Notes From The Tomato Lady 
Tomatoes are sensitive to all sorts of chemical, besides herbicides. Even something as simple and safe as Windex can annoy them.
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Is it safe to eat tomatoes from a plant that has very minor herbicide drift issues? Do you eat them?
if. it touched the tomatoes,I wouldn’t unless yu washed them very,very well
I am thinking it is 2,4,D damage. The church by my garden community plot & a couple of homes had their lawns sprayed a couple of weeks ago and they use Dicamba & 2,4,D. I have read that 2,4,D is systemic and that is why I am concerned. My plants look healthy for the most part, but each has one or two branches that are concerning.
Whenever I see people spraying, I go over and make them aware that wind drift is unacceptable. Then I will get their name and the company they work for. They should NEVER spray when there is any wind. it will affect the leaves first.
I know, but I don’t live close to my Community Garden Plot so I didn’t see them spraying–only the flags they put up afterwards. I have a few cherry tomato plants that only have a branch or two with affected, long, abnormal looking leaves that aren’t twisting. I am trying to determine if this is so mild that the fruit is safe, or if I should pull them and go on living. Thank you for replying!