There are two specific pests that cause large issues on lawns in the UK, Leatherjackets and Chafer Grubs; some pests can cause minor issues such as worms and ants. The treatment we use for controlling Leatherjackets and Chafer Grubs is the biological control - Nematodes. The treatment we use for worms is an irritant that reduces the surface activity and this lessens the amount of casts produced. At the time of writing we have no specific control for ants however, we would advise using a spade, slicing into the lawn where the activity is and applying ant powder into the nest, pull out the spade and restore the crevice.
Worms are generally good for the lawn; there are 25 species however, there are only 3 that cause casts in the lawn. The process worms have by moving through the soil is good for microbial activity and aeration. The cast that they return to the surface can look ugly and be a good seed bed for weeds.
The liquid spray we apply acts like sand, which irritates the worms and by removing them from the surface; generally it does not kill them. This spray will need to be applied twice per year, once in the autumn and again in the spring when activity is at its height.