Soil Insecticide Investigations at the Japanese Beetle Laboratory During 1923

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Abstract
The experimental work thruout the year with Popillia japonica has been carried on with the object of evolving methods of chemically treating the soil about the roots of such plants as conifers, boxwoods, azaleas, rhododendrons, hydrangeas, ferns, blueberries and perennials for the control of the soil stages of the Japanese beetle. Emulsions of carbon disulfide and wormseed oil have proved satisfactory in these connections and are now in use by the local nursery and greenhouse concerns.

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