Thank you for the information! If you don’t mind, I’d like to throw out another possibility hoping it might allow time for more of the hatchlings to emerge unharmed. I read that the wasps prefer to create nests in dry, loose soil – the exact conditions currently in the courtyards. If the property mangers were to provide irrigation to the areas during the busy weeks, would that likely change soil conditions enough to encourage the females to hunt elsewhere for nursery sites? If that were the case, we could delay installing the fabric and mulch to prevent future excavations.

The property managers are in a little bit of sticky situation – I am impressed that they are even willing to entertain least toxic measures given