I vapor treated a 2 deep hive with approx 2 grams (two 1/2 inch end cap measures) of Oxalic Acid-- Hardware store wood bleach brand. My vapor is created in a copper pipe slowly heated with a propane torch. Vapor was introduced via a reduced entrance cleat, and hive was fumigated for 10 min by closing the cleat with paper towelling. Hive is in sunny coastal California, mid 50's F. on day of treatment, upper 30's at night
Two days out I have approximately 50% of the hive dead on my Screen Bottom Board. I only have about 2 covered frames. Uncertain on the queen.
Anyone else have major die-off of this scale from 2 gram fumigations.
I have minimal experience with Oxalic, and was not expecting this outcome. What did I do wrong?