Weevil—a chewing insect
In the fighting of all Insects, success depends upon taking them in time. If something is known of the life history of the Insect, very much will be gained, for the operator may be on hand as soon as the Insect is expected to appear.
Insects on House Plants.—The most troublesome or common Insects with which the amateur is likely to meet in the window-garden or conservatory are the red spider, mite, mealy bug, aphis, and scale.
The red spider is a very minute Insect with a reddish body. Its presence may be suspected whenever plants are growing in a warm and dry place. Usually it first appears on the under side of leaves, but it multiplies rapidly, and will soon not be so choice of position. It sucks the juices of the leaves, and they soon indicate the injury by a dull appearance, and also, in many cases, by small whitish or paler areas on the upper surfaces. The mite is of similar habits and size, but is of a pale color, with black on its back. It appears under the same conditions as the red spider. These pests are small, but are very serious if allowed to multiply unchecked. They should be looked after as soon as their presence is detected.
The remedy is to arrange for keeping the air about the plants more moist, and giving drenchings of the foliage with clear or soapy water. The latter is most effective. The soap used may be simply the common washing soap, or that sold at drug stores known as whale-oil soap. In fighting them, care must be used not to keep the soil soaked with water, or it will check the plants in vigor and only add to the strength of the enemy. Even florists sometimes get into just such a predicament. Flagging and extreme variations in dryness and humidity of the air, checking the vigor of plants, favor the appearance and presence of the red spider quite as much as extreme and continued dryness of the air.
The aphids or plant lice are readily discernable when they appear on plants, as they are sure to do under nearly all conditions. They are small, have elongated, succulent bodies, move about slowly and awkwardly, on rather long, hairlike legs, and are most commonly of a pale green color, though often brown or reddish, and sometimes of other shades. Fumigation of the plants in a closed box with burning tobacco stems will kill them. Latterly florists evaporate a liquid extract of tobacco (which is sold by dealers in florists’ supplies) by dropping a hot iron into a pan of it. A tea made by soaking tobacco stems in water for a few hours, and applied with a syringe, is effective, and a safe remedy in inexperienced hands. A tablespoonful of tobacco sheep-dip, or extract of tobacco, to a couple of gallons of water, also makes an effective syringing or dipping solution. As mentioned above, we should use care, especially in the winter time, when the soil often dries out slowly, to avoid soaking it when already wet or sufficiently moist.
One of the kind which sucks its food
Mealy bug has a small, flat, tortoise-shaped body, from about one-sixteenth to one-eighth of an inch long. The Insects collect in masses in the axils of the leaves. They are covered with a white mealy or cottony substance, and are readily recognized, although persons unfamiliar with their appearance have sometimes mistaken them for bits of down or cotton lodged upon the foliage or in the axils of the leaves. The young are small, and likely to escape observation unless one looks closely. They are flat, of a creamy or pinkish tint, and lie close to the surface of the leaves, especially on the under surface. Coleus and bouvardias are among the plants upon which mealy bugs are most often found. Owing to the oily nature of their covering, it is difficult to wet their bodies with any ordinary liquid that may be applied for the purpose of destroying them. Fir-tree oil is one of the most effective remedies for them. This liquid is rather expensive, but for a small collection a gallon can will last for a long time. It is also effective against other Insects. For mealy bugs, two tablespoonfuls of the oil to one pint of water will make an effective dipping or spraying solution. Soft or rain-water should be used, and tin, wooden, or earthenware vessels. Galvanized iron vessels are to be avoided. Apply forcibly with a syringe or atomizer, preferably in the evening. If effective, the mealy bug will turn buff-color. For other Insects, except for the scale, mentioned below, the solution will not need to be more than half or a fourth so strong. Where there are only a few mealy bugs, the plant may be gone over with a soft brush and the Insects crushed.