White flys have devastated our garden this year. Particularly the tomatoes. We have tried Neem oil - no help
Josephine County Oregon
Whiteflies are sucking insects that inhabit the underside of leaves and can kill tomato plants. One source suggests spraying infested tomato plants with insecticidal soap, concentrating the spray on the underside of the leaves where whiteflies congregate and breed. Repeat the application every three days until no more whiteflies are present. Spray in the evening to minimize contact with beneficial insects.
The Pacific Northwest Pest Management Handbook lists additional chemical controls for home use. https://pnwhandbooks.org/insect/vegetable/vegetable-pests/hosts-pests/tomato-whitefly
As with insecticidal soap, you may have to make several applications of the product, following all label directions, and being sure to drench the undersides of the leaves.