How to combat mites on begonias? - briefly
Treat infestations by washing the leaves with a strong stream of water, then applying neem oil or an approved insecticidal soap every 5–7 days, removing severely damaged foliage, and keeping humidity low to discourage mite reproduction.
How to combat mites on begonias? - in detail
Mite infestations on begonia foliage require a systematic approach that combines early detection, cultural adjustments, and targeted treatments.
First, inspect plants weekly. Look for stippled leaves, tiny moving specks, or fine webbing on the undersides. Use a magnifying lens to confirm the presence of spider mites, two‑spotted mites, or broad mites.
Second, modify the growing environment to discourage population growth:
- Increase ambient humidity to 60 % or higher; mites thrive in dry air.
- Maintain temperatures between 65 °F and 75 °F; extreme heat accelerates reproduction.
- Ensure adequate spacing between plants to improve airflow and reduce leaf wetness.
- Remove heavily infested leaves promptly to lower the overall mite load.
Third, apply control measures in the following order:
- Mechanical removal – Rinse foliage with a strong stream of water or spray a solution of water and a few drops of mild dish soap (1 % concentration). The jet dislodges mites and their webs.
- Biological agents – Introduce predatory mites such as Phytoseiulus persimilis or Neoseiulus californicus. Release rates of 50–100 predators per square foot provide rapid suppression.
- Botanical insecticides – Apply neem oil or rosemary oil emulsions at label‑recommended rates. These compounds interfere with mite feeding and reproduction while remaining safe for most beneficial insects.
- Synthetic acaricides – When infestations exceed economic thresholds, use products containing abamectin, bifenazate, or spiromesifen. Rotate active ingredients to prevent resistance, and follow pre‑harvest interval guidelines.
Fourth, monitor treatment efficacy. After each application, reassess leaf damage and mite counts after 5–7 days. Continue the cycle of inspection, cultural adjustments, and control until mite populations fall below detectable levels for two consecutive weeks.
Finally, implement preventive practices: clean tools, avoid overhead watering that promotes dry leaf surfaces, and quarantine new plants before introducing them to the collection. Consistent adherence to these steps minimizes the risk of recurring mite problems and sustains healthy begonia growth.