This section is from "The Horticulturist, And Journal Of Rural Art And Rural Taste", by P. Barry, A. J. Downing, J. Jay Smith, Peter B. Mead, F. W. Woodward, Henry T. Williams. Also available from Amazon: Horticulturist and Journal of Rural Art and Rural Taste.
A correspondent writes us that this is entirely ineffective in his experience. "At a meeting of a Farmers' Club in this vicinity, held this past year, the subject of diseases of vegetation came up for consideration, and the various remedies for the 'currant worm' were discussed. Hellebore seemed to claim the first place for effectiveness, but one of our townsmen presented the claims of 'carbolate of lime.' A question was asked in reference to its appearance, application, etc, which was answered that it was a powder somewhat resembling hellebore, and could be used the same, when a member present remarked, ' perhaps the worms think it is hellebore.' I think its effectiveness must be attributed to this cause. The president of the Newton club informs me that they, in discussion, united in pronouncing it ' not sure.' A neighbor of mine has made a thorough trial of it and Bays, ' if it kills after the worms are three days old, it is by accident,' and from experience with it I am led to conclude that when they first appear (more especially the first crop), it will destroy them, but after they are more fully grown it is ineffective, in fact they sometimes seem to relish it than otherwise. So I conclude that the worms have found out that it is not hellebore after all.
Hellebore loses its strength by exposure, and often times where this fails I think it is from having been kept without proper protection from the air, as it is a sure remedy when good, and yet it is not by any means a dangerous article, because of its poisonous properties evaporating so soon after it comes to the air by application." A. B.