Reynoutria sachalinensis = the bottle of regalia. So the key with that shit is freshness. I wouldn't purchase anything that was more than 6 months old. It has
hybridised with
Reynoutria japonica in cultivation; the hybrid,
Reynoutria × bohemica is frequently found in the British Isles and elsewhere.
Extracts of this plant can be used as plant protectants for certain fungal and bacterial diseases
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Here's a pretty good list of how to make many of these off the shelf products;
opensalts.wikidot.com
opensalts.wikidot.com
opensalts.wikidot.com
Here's the formulation on Regalia specifically;
Regalia from Marrone Bioscience is a biostimulant and systemic fungicide for powdery mildew. All species of knotweed are active and it's very simple to make.
Load up your soxlet to capacity with any ground part of the knotweed plant (Leaves, stems and especially roots) with 95-97% alcohol. Let it run for 4-8 hours. Put in your rotovap to recover solvent. Dilute to 50% with water and add 12.5g/l citric acid as a stabilizer. Use at 3-6ml/gallon with water drench or foliar.
If you don't have a laboratory:
Alternately, soak all knotweed parts in alcohol for a month. Evaporate completely and add 50% water, 12.5g/L citric acid. It's probably a slightly higher dosage than the first method.
opensalts.wikidot.com
Yay! She's back in circulation.