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This article was published originally on 10/11/1996
Winter Protection For Roses
When Is It Too Late To Treat For White Grubs?Although white grub insecticides will be effective as long as the soil temperature stays above 50F, monitoring for grub location is a better indication of application timeliness. Pull back the grub-damaged turf and look for the grubs. If they are still present in the upper root zone (just under the thatch), they have not yet begun to move deeper into the soil, and treatment will be effective. In general, grubs move below the root zone in preparation for winter by late October.
White grub problems appear to be much fewer than in the recent past, with very few reports of severe damage.
Year of Publication:
IC-475(24) -- October 11, 1996