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The Pamphlet Collection of Sir Robert Stout: Volume 14



When it is ascertained that the grubs or larvae of the hop cone fly are doing mischief to the plant-centres, dressings of lime, soot, lime ashes, or of sawdust or ashes steeped in paraffin oil should be put as closely as possible round them.* It is important to prevent the development of the flies, as there is no remedial measure that can be applied when these have established themselves in the cones.

* In America about one quart of paraffin oil is put to a wheel-barrow load of ashes, and very carefully mixed.