Last year I had problems with whiteflies nearly killing my plants and didn't have much success with neem oil, especially since it didn't stop raining.
This year I haven't had a problem yet and I don't spray. I know once it gets hotter I'll see many more. Although some of my plants (not my tomatoes) are treated with Imidacloprid soil drench (Bayer Advanced) such as my Angel's Trumpet. It seems the flies go plant to plant and die once they feast on treated ornamentals.
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