Do you by any chance have a spider mite problem? Those leaves look like my basil after the mites got to them. Seems like herbs with tender leaves are most susceptible. The mites are not as easy to spot as they are on tomatoes.
After the herbs, the mites like to work on my strawberries, bean, cukes, and eggplants before graduating to the tomatoes. Oh, and this year they liked my Swiss chard, blueberries and raspberries too.
The berries all seem to recover after summer, although of course by then I have not gotten much fruit, so it's...fruitless.