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Another thing you may look into are "Beneficial Nematodes". Best prices we've found are from buglogical.com
100% natural. Like anything natural immediate results will not take place, but it will help significantly. Most importantly, be sure to advise your client if their neighbors also have bad grub problems, it will be that much harder for them to get rid of it and they should try to talk to their neighbors about getting on a grub control program as well.
Take a soil sample and send it to your local extension center or soil lab, that way you'll know what else is going on. A
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