Garden Pest Control
They sell effective anti-wasp products. Complement the control by plugging the holes in the walls and buildings that is where the queen wasp gets into. For swimming pools, there is a wasp repellent spray that is placed on the surface of the water.
Snails and Slugs
Pay attention to snails and slugs in the garden. They gnaw the tender shoots and leaves. There are products to eliminate them such as Mesurol, but you can also resort to methods such as the use of beer that attracts them or salt, which do not withstand their contact.