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.
Several of my nice geraniums began to look sickly, and upon examination I found little worms at the roots. I applied a solution of weak carbolic acid quite freely to the earth, and found it restored the plants to health and beauty in a very short time. It will also kill lice upon the stalks, if applied with a swab or feather to the plants, without injuring the foliage.- Country Gentleman.