Hi, 

We think most of this damage is from insect feeding and we are leaning towards Four Lined plant Bug. This is common for so many plants. 

The Oregano looks like it has some stippling from leaf hopper feeding but that is also common for oregano. It may have some minor cercospora leaf spots which are a fungal symptom but don't warrant a fungicide. The plants will recover. 

The basil looks like in addition to the four lined plant bug feeding may also have some slug or snail feeding in the larger areas that are causing holes. 

Anything with minor holes you can still eat, maybe if there is a lot of damage from slugs - personally I would not find that palatable since they leave a slime trail where ever they are but you could try washing them off. 

The leaves with the cercospora you can try to pluck off to help keep any fungal spores from spreading but they may still occur. It shouldn't harm you to consume those either. 

Emily

Hello Robert,

When a treatment is possible, options are given in the pages that Emily linked to. In general, fungal infections are not treatable once symptoms appear, since a fungicide cannot cure existing disease or reverse its damage, though they can help to protect new growth from infection. Even so, not many will be labeled for use on edible plants, and their use might negatively impact pollinators or other organisms. Similarly, insect sprays of a low-toxicity nature, like horticultural oil or insecticidal soap, must directly contact the pest to be effective; dried residues will have no impact, so if a pest is not actively present during treatment, the application will provide no benefit. Plus, sometimes damaged leaves are further injured by a pesticide spray, even if it works well to suppress a pest.

If you do find pests later that warrant treatment (and they need to be identified first, to know which ingredient is the most effective to use), follow all product label directions for use, and make sure it's labeled for use on edible plants in the first place. (Sprays sharing the same active ingredient won't be interchangeable if one is labeled for use on herbs/vegetables and the other is not, so inspect the label directions carefully when selecting one to try.) Don't substitute a soap or oil spray with a homemade alternative, as it won't be as effective or, at worst, will cause even more plant damage and may not be food-safe.

Fortunately, all three of these plants should be able to outgrow insect or slug feeding as long as their roots remain healthy. (For example, be aware of over-watering since all three are intolerant of prolonged soggy or poorly-drained soil.) They look good so far!

Miri

You're welcome.