"bnd777" wrote in message ...
What insecticides can I use to kill Chafer Grubs in my lawn please

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Chemical control of mature Cock Chafer grubs in turf is not easy;
young larvae may be eradicated by the proper use of the chemical
pirimiphos-methyl.
Adult Chafer can be controlled by the use of a pathogenic nematode
'Steinernema carpocarpsae'. These are watered into the turf in late
summer. They release a bacteria into the body of the grubs which
eventually kills them.

Peter.