only, they will be gone soon, so don't worry about them too much, they are changing into adults at the moment, i think you were just unfortunate that we had such heavy rains, this is what brought them up to the surface, as far as using insecticide goes i wouldn't bother. they are not something to worry about in the average lawn, more a problem for golf courses on greens and the like. If you look in fields around the country at this time of the year you may notice large nos of birds especially rooks feeding on grassland, leatherjackets are what they are after, they love them!
sue
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