The library has no garlic-specific rust advice, but it covers WCP and the growth periods in general.
WCP is the Pure Structure solution, made from bones. It helps harden a plant against pests (Pure KNF Manual, p. 32). Cho's basic dilution is 1/1,000 (Cho, Recipe, p. 65). Spray it on leaves during cross-over and vegetative growth (Cho, Recipe, p. 65).
Cho names three growth periods: nutritional growth, change-over, and reproductive growth (Cho, Recipe, p. 29). The change-over is the most important time to spray, right before floral differentiation (Office Hours Ep. 65, 37:57).
For rust on leaves, the library lists KNF Protectors (LAB), diluted 1:1000 and sprayed on the leaf surface (Office Hours Ep. 55, 15:31). That advice came up for fig trees, not garlic (Office Hours Ep. 55, 11:54). For figs the library also names liquid IMO or an IMO4 tea, and says sulfur works but fights balance (Office Hours Ep. 55, 11:54).
The library does not give garlic's own growth stages or a rust spray schedule for garlic.
Sources
