Signs of tomato potato psyllid include:
- Insects jumping from the foliage when disturbed.
- Severe wilting of plants caused by high numbers of psyllids feeding.
- Yellowing of leaf margins and upward curling of the leaves.
- White sugar-like granules (excreted by adults and nymphs), which coats the plant leaves and stems, and can lead to the development of sooty mould.
- Ants may be symptomatic of the presence of the white sugar-like granules.
- Stem death symptoms are similar to other potato and tomato disorders.