Symptoms

Yellowish spots on the upper leaf surface

Understand Yellowish spots on the upper leaf surface on plants: possible causes, affected plants, and matching diagnosis guides. 17 affected plants.

Editorial diagnosis

Diagnosis overview

Yellowish spots on the upper leaf surface is a visible plant sign, not a diagnosis on its own. The affected plant part, distribution of the pattern, and its progression help narrow down the possible causes.

The symptom is documented in the available plant profiles for crops including Tree spinach, Watercress, Chayote, Common chicory. Also check weather, watering, soil moisture, and any changes appearing at the same time.

Compare healthy and affected plants directly and record whether young or old leaves, individual shoots, or the whole plant are affected first. Photos taken several days apart can also show whether the pattern is progressing or remains stable.

A common diagnostic mistake is to assign one visible sign immediately to a specific deficiency, pest, or pathogen. Compare several plausible causes before fertilising or treating the plant.

At a glance

Plants

Possible causes

Possible confusion

The visible symptom alone is not enough for a diagnosis. These additional signs help distinguish the linked causes.

Downy mildew: Also check for Yellowish leaf spots; Grey/purple growth beneath leaves.
White blister: Also check for White pustules; Yellowish spots above.