The mild warm month of April provided ideal conditions for the development of wasp colonies with many sightings of queens emerging from hibernation. At this time of year they are building the first few cells of their nest into which they lay their eggs. When these hatch they become the first worker wasps and take over the role of foraging for food and buidling materials.
Unless there is a late cold spell this could be a bumper year for wasps.
If you have any strong lures for wasps in your garden, such as fruit trees, or if you operate a food outlet of any sort prone to wasp nuisance, this is the time to put your Waspinators out, before the wasps get used to visiting your food source – it is easier to prevent a habit than to overcome it.