The codlin-moth
Scales are most commonly of a brown or whitish color, flat or tortoise-shaped, and easily seen. They adhere closely by the under surface of their bodies to the stems, branches, and foliage of woody plants. The mature Insect is stationary, and its body at length becomes a shell containing hundreds of eggs. These hatch, and the young emerge from the shell, crawl about and settle, to develop into the familiar form. A strong solution of fir-tree oil, like that used for mealy bugs, is a good remedy. A strong solution of whale-oil soap, made by adding an ounce or more of the soap to three gallons of water, even more if necessary, is also useful in combating them. After dipping or syringing the plants they may be allowed to stand over night, when they should be rinsed off with clear water. Applications may need repeating every three or four days until the Insects are gotten rid of. It is difficult, for a time, to tell when they are dead. If killed, the bodies will fall off easily, and in the case of the soft-shelled species shrivel up somewhat after a time. Kerosene and water emulsion ([see Kerosene]) will kill them.
Insecticide. A substance which will kill insects. Insecticides are of two general classes—those that kill by contact ([see Kerosene]), and those that poison the insect (see [Paris Green] and [Hellebore]).
Iris. Many handsome perennials, of which the Blue Flag is familiar to every old-fashioned garden. Most Irises thrive best in a rather moist soil, and some of them may be colonized in the water in margins of ponds. Gardeners usually divide them into two sections—the tuberous-rooted or rhizomatous, and the bulbous. A third division—the fibrous-rooted—is sometimes made. The common and most serviceable species belong to the tuberous-rooted section. Here belongs the beautiful and varied Japanese Iris, Iris lævigata (or I. Kæmpferi), which is among the most deserving of all hardy perennials. Most of these Irises need no special care. They are propagated by division of the rootstocks. Plant the pieces 1 foot apart if a mass effect is desired. When the plants begin to fail, dig them up, divide the roots, discard the old parts and grow a new stock, as before. I. Susiana, of this section, is one of the oddest of Irises, but it is not quite hardy in the North. Of the bulbous section, most species are not hardy in the North. The bulbs should be taken up and replanted every two or three years. The Persian and Spanish Irises belong here. The bulbs give rise to but a single stem.
Kale. A low-growing, spreading plant belonging to the cabbage family and extensively used for winter and spring greens. The same culture as given to late cabbage is suitable. At the approach of severe freezing weather a slight protection is given in the North. The leaves remain green through the winter and may be gathered from under the snow at a time when material for greens is scarce. Some of the Kales are very ornamental because of their blue and purple curled foliage. The Scotch Curled is the most popular variety. Kales are extensively grown at Norfolk, Va., and southward, and shipped north in winter. Let the plants stand 18 to 30 inches apart. Young cabbage plants are sometimes used as Kale. [See Collards.] Borecole is a kind of Kale. Sea Kale is a wholly different vegetable ([which see]).
Kerosene is fatal to insects. It is likely to injure plants if applied full strength, although if applied in full sunlight (so that evaporation takes place rapidly) it may do no harm. It is safest to apply it in dilution. Of late, there are pumps which mix or emulsify Kerosene and water in definite proportions, and this mixture (in the proportion of ⅕ or ¼ Kerosene) is fatal to insects and usually harmless to plants. The standard Kerosene emulsion is with soap, but the perfection of mechanical devices for emulsifying it with water is probably destined to supplant the soap emulsion.
Kerosene Emulsion.—Hard soap, ½ pound; boiling soft water, 1 gallon; Kerosene, 2 gallons. Dissolve the soap in the water, add the Kerosene, and churn with a pump for 5 to 10 minutes. Dilute 10 to 25 times before applying. Use strong emulsion, diluted four times in winter, for all scale insects. For insects which suck, as plant-lice, mealy bugs, red spider, thrips, bark-lice or scale. Cabbage-worms, currant-worms, and all insects which have soft bodies can also be successfully treated.
Kohlrabi. This vegetable looks like a leafy turnip growing above ground. If used when small (2 to 3 inches in diam.), and not allowed to become hard and tough, it is of superior quality. It should be more generally grown. The culture is very simple. A succession of sowings should be made from early spring until the middle of summer, in drills 18 inches to 2 feet apart, thinning the young plants to 6 or 8 inches in the rows. It matures as quickly as turnips. One ounce of seed to 100 feet of drill.
