For the adult, though, you can spray with pyrethrins, diazinon, methoxychlor, or carbaryl. Leaves are mottled and yellowing, and a puff of white insects arises if the plant is tapped. Whiteflies are tiny white insects that feed on plant sap. Spray with insecticidal soap, pyrethrins, malathion, or diazinon. You can also set out yellow sticky traps whose color will attract them.
Nematodes are microscopic worms that live in the soil and feed on plant roots.
If you pull the plant out of the ground, you ll notice that the roots are swollen and distorted. Leaves have light and dark mottling on them. Tobacco mosaic virus is very infectious and can be spread by simply brushing against plants. Destroy infected plants. Don't handle tobacco before working around tomato your plants, and grow resistant varieties next season.