Leatherjackets l Chafer Grubs l Ants l Moles l Mining Bees | Worms | are prime examples of 'Lawn Destroying Insects'
Lawns do not suffer from too many insect pests or bugs. (The same cannot be said of other lawn troubles!) Pests are things that crawl of fly - Diseases have no legs i.e. Fungus and virus diseases.
As with most problems - and lawn pests are certainly that - prevention is far better than cure. However, with lawns, there are often no sympotoms until the pest has got a good hold on their meal, and we see the inevitable results well after the infestation has started.
The pests that cause problems are normally visible to the human eye - although often, they are under the surface of the lawn, so we have to look for and recognise the symptoms. The most common of garden pests - visible aphids - are not a problem for lawns. So other than ants - we normally have to get below the surface!
Insect pests are normally easy to recognise and deal with before there is too much damage. Diseases tend to infect a large area of turf, and are thereafter more difficult to deal with. Insect problems start in more localised patches, and the damage is normally to the grass roots - rather than the plant as a whole.
Obviously, root damage affects the whole plant, but dealing with the insect pests soon as identified, normally means that the grass will soon re-grow or recover. Small regular shaped brown patches in your lawn are normally the result of an insect pest. You can soon identify at the link re brown patches.
Lawn care is important as a preventative method - simply because a good dense sward of turf is better equipped to shrug off a few hungry grubs!
Lawn Disease problems on the other hand, tend to linger and spread unseen for quite some time before damage is apparent.
Related | Brown Patches Identified