Various propagation and care process for Haworthias can leave wounds on the plant bodies. A proper management not only protects a plant from rotting caused by pathogen infection but also promotes faster growth of plant tissues like roots.
Prepare a mix of fungicide powders with rooting hormone powders as the medicine. For fungicide, thiophanate-methyl is effective and even has systemic effects. For rooting hormone, both indole-3-butyric acid (IBA) and 1-naphthaleneacetic acid (NAA) products are good choices. In the mix, the proportion of thiophanate-methyl should be ~30%, and the IBA or NAA should be no more than 0.2%. An excessively high concentration of rooting hormone can inhibit root growth. If needed, pure talc can be used to dilute.
For treatment, use a cotton swab and stir the powder mix with ~70% isopropyl alcohol solution (rubbing alcohol) till they form a thick paste. Apply the paste on and around the wound to form a coating. Alcohol can kill certain pathogens on the wound and also assists fungicide and rooting hormone to permeate plant tissues. Keep the plant in a shaded and cool (ideally <=20°C) place for 2~3 weeks, so that a callus can be formed on the wound.