Black Rot

Editorial diagnosis

Diagnosis overview

Black rot describes dark rot damage on leaves, tubers, or stored produce.

In gardens, Black Rot can occur on plants including cauliflower, sweet potato. In the available profiles, it is linked mainly with Brassicas, Root vegetables.

Its importance depends on how quickly it spreads and whether seedlings, shoot tips, flowers, or fruit are affected. Conditions that favour it include Wet weather or prolonged leaf wetness, Dense planting and poor airflow, Susceptible cultivars. It becomes serious when stored produce infects neighbouring produce.

Compare upper and lower leaf surfaces, the boundary between healthy and damaged tissue, and spread after wet weather. Coatings, spores, or progressive rot support a disease diagnosis.

A common mistake is to identify a disease from one spot alone; weather, spread, and pathogen structures also need to fit.