Disease from pruning
Top answer
From the KNF library
The library gives OHN at 1:1000. Use 1:1500 if the plants are stressed or your OHN is older than 6 months. (Student's Manual, Basic Course, p. 27) It also lists an OHN, FPJ and BRV cocktail sprayed every 10 to 12 days. That source ties the cocktail to powdery and downy mildew, not bark wounds.
The library names LAB among the KNF protectors. (Office Hours Ep. 21, 53:40) Protectors go on tree nursery stock at 1:1000, or 1:700 if disease is bad. (Office Hours Ep. 6, 1:12:50)
At the next pruning, Drake recommends dabbing LAB on fresh cuts. Where you can, prune on a rising or peak tide so less sap pulls up through the wound. (Office Hours Feb 2026, 47:26)
For bark, the library paints a slurry of IMO, seawater and oatmeal onto mossy bark to ease sunburn and help it heal. (Office Hours Ep. 20, 1:06:05)
The library does not cover treating old infected cuts, black cracks in bark, shade, or SES with quick microbes.
Sources
- 47:26 Office Hours (Feb 2026) — LAB Troubleshooting, Pruning Fruit Trees, IMO Soil Mix · “Dab LAB on fresh cuts, and where you can, time pruning to a rising or peak tide so less sap pulls up through the wound.”
- 1:06:05 Office Hours Ep. 20 (Feb 2022) — Crystal Vortex Brewer, Pig Pen Sizing, WCA/WCP for People · “Paint a slurry of IMO, seawater, and oatmeal onto the mossy bark to ease sunburn and help it heal.”
- 1:12:50 Office Hours Ep. 6 (Nov 2021) — IMO4 Degreaser, Pig Pen Biochar, Maltose Growth Stimulant · “apply KNF Protectors at 1:1000 (1:700 if disease is bad)”
- 53:40 Office Hours Ep. 21 (Mar 2022) — Water-Soluble Calcium, Wood Ash, Filtering FAA · “LAB are the "KNF protectors"”
- p. 27 Student's Manual, Basic Course · “OHN is mixed with water at a ratio of 1:1000. It is mixed with water at a ratio of 1:1500 if the plants are stressed OR your OHN is older than 6 months”
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