ASK ED MARIJUANA GROW TIP #45: THE BOTRYTIS SOLUTION
There was a slight attack of botrytis due to humid conditions and stagnant air—circulation was minimal with only passive ventilation during part of the day.
We immediately went into protective mode—using Ed Rosenthal’s Zero ToleranceTM Herbal Fungicide diluted by 25%, and adding Serenade concentration at half the recommended dosage. Our reasoning was that the ERZT would kill the botrytis immediately and leave a fungicidal residue of potassium bicarbonate, which is a fertilizer usable by the plant. The Serenade also attacks the botrytis directly, thus creating a redundant kill situation. In addition, the active organisms in the Serenade continue to have residual benefit.
This has several advantages over physically removing the infected tissue while the cola is still on the plant. The first is that in removing the dead tissue there is a good possibility of damaging the healthy tissue and infecting it, since you are handling the infected area and reproductive spores may disburse to surrounding plant tissue. The second problem with it is that it is often hard to distinguish between infected and non-infected areas, especially in large buds with crevices.