Out Of Interest
As you've probably noticed, wasps and hornets are starting to get aggressive. Everytime I step outside on to my porch they buzz and fly around me. A few times they have even tapped me. Threatening they will attack. I am allergic to their stings.
The main reason they become aggressive this time of year is because as the weather cools their food source becomes scarce and competition gets fierce.
For the wasps, the Queen has stopped laying eggs. The larvae no longer provide a food source for the adult wasps. Lack of food makes for more aggressive, angry wasps.
They are looking for sugar and protein.
You don't want to be near their nests. They will protect it fiercely and will proceive you as a threat.