It's on stem...

Hi J Grant it's pith necrosis disease. Plesae click on this link: https://ag.umass.edu/vegetable/fact-sheets/tomato-pith-necrosis

Hello J Grant, So conspicuous but the outgrowth structures are root premortals that produce supportive roots to protect the plant from lodging. Hope that it makes a sense😂

If this pests is looks like White powder just spray alcohol on it just make it wet and spray wood ash once that all gone even on the soil surface of your plants