This section is from the book "The Gardener's Monthly And Horticulturist V18", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
In your May number, in reply to the inquiries of a correspondent on this subject, you recommend the use of powdered quick lime (not slacked lime) sifted over the trees by means of a suitable sieve fastened to a long pole. There are several objections to the use of this material. The powdering of quick lime is a difficulty which but few could overcome; the mechanical appliances necessary for the purpose not being available. Then the unpleasantly caustic action of the lime on the eyes and skin of the operator is such as to interfere seriously with a second application of the remedy.
Having had to contend with frequent swarms of these insects on my pear orchards, I have found nothing so good or so easily applied as powdered hellebore; one pound of the powder mixed with a barrel of water has been found stong enough. My mode of operating is as follows. The barrel of Hellebore and water is placed on a one-horse cart, and on the cart is erected a suitable platform for the operator, who is supplied with an ordinary watering can. From his elevated position on the platform he showers the death-dealing liquid on the foliage, driving from tree to tree as the sprinkling is effected; a light shower is all that is needed, and effectually cleans the trees. Passing up one side of a row and down the other side where the trees are not very large, an active man can easily operate on from two hundred to three hundred in a day. Where the trees are too large to admit of their being entirely reached in the manner described, the liquid can be effectually applied with a garden syringe.