Answer: Although it sounds as though you've tried every product on the market to control the grubs, I think you've been using all the wrong things. Pine Sol and beer will have no effect on these pests. Diazinon is a powerful insecticide, but isn't as effective as Dursban against grubs. Beneficial nematodes are quite effective, but their application has to be timed just right, and repeated annually. These microscopic worm-like creatures attack only the grubs in the soil and not plants, animals or humans. Spray them in spring when the temerpatures are above 55F and you should see a difference this summer. You can buy the beneficial nematodes from, Gardeners Supply Co, 128 Intervale Rd. Burlington, VT 05401. Phone 800-863-1700.
Another product is milky spore powder, a naturally-occuring bacteria that kills grubs; you simply apply the powder in a grid pattern on your lawn. The powder is harmless to earthworms and other creatures. The bacteria will continue to multiply, and will keep working for up to 20 years. (The results won't be immediate, however; it will take some time to notice a decline in the grub population.) Available from Gardener's Supply, 1-800-863-1700; http://www.gardeners.com
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