A small, yellowish white insect with transparent wings, usually found on the under side of the rose leaves. This pest appears in swarms and in an astonishingly short time turns the foliage yellow.
If the pest appears, spray the rose plants daily with a hose as suggested above. If this does not prove efficacious, dust the under side of the leaves with white hellebore in a powder gun. Whale oil soap solution, in the proportions of 5 oz. of soap to 1 gal. of water, is a very good remedy. It is easier to dissolve the soap if the water is hot.
Rose Caterpillar or Leaf-roller
Several kinds of caterpillars may appear, varying from one-half to three-quarters of an inch in length, and either green, yellow or brown in color. They have a habit of enveloping themselves in the rose leaves, or boring their way into the flower buds. In the latter case they are very apt to be overlooked.
Powdered hellebore will hinder their progress, but by far the most effective weapons are the finger and thumb—gloved, if you insist.
Rose Chafer or Rose-bug
This brown beetle, less than one-half inch in length, is one of the best-known rose pests. It is a slow-moving creature that appears suddenly in armies in the blooming season in June, and is the more annoying for the reason that it devotes its attention almost entirely to the flowers themselves.
Paris green, dusted over the plants, will kill the pest, but this poison has a disagreeable way of showing no intelligent discrimination in the choice of its victims. Really the only satisfactory method of attack is to knock the stupid creatures off the flowers into a tin of kerosene and then burn it.
Rose Slug
The larvæ of a saw-fly which comes up out of the ground in May and June. The female makes incisions in the leaves and deposits her eggs, which hatch out in about two weeks. The slugs will eat an astonishing amount of leaf if not checked. They are about a half-inch long, green, and will be found on the upper side of the leaf.