A Preliminary Report on the Control of White Grubs With a Rotary Plow1

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Abstract
Mechanical experiments for the control of white grubs by means of a Rotary Plow were conducted in virgin bluegrass pasture, timothy sod, and old corn stubble in southern Iowa, 96.7% of the grubs being killed during the plowing operation. Population, down (fall) and up (spring) migration, and transformation data were also secured for Brood A. The average grub population in a virgin 88-acre bluegrass pasture was 181,863 grubs to the acre, the most heavily infested spot yielding 223,245 grubs per acre. In the transformation and hibernation studies it was found that only 4% of the Phyllophaga spp. were within plow depth during the pupal and adult stages.

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