. The American fruit culturist, containing directions for the propagation and culture of all fruits adapted to the United States. Fruit-culture. DESTRUCTIVE INSECTS. 163 and is easily killed with kerosene emulsion, a strong soap so- lution, or a tobacco decoction applied in a forceful spray. The root form is much more difficult to reach. Badly infested nursery stock should be destroyed. The roots of slightly affected stock should be dipped for a few seconds in water kept at a temperature of 130 to 150 F., or in a warm, strong soap solution, before it is planted. Recent experiments show that fi
. The American fruit culturist, containing directions for the propagation and culture of all fruits adapted to the United States. Fruit-culture. DESTRUCTIVE INSECTS. 163 and is easily killed with kerosene emulsion, a strong soap so- lution, or a tobacco decoction applied in a forceful spray. The root form is much more difficult to reach. Badly infested nursery stock should be destroyed. The roots of slightly affected stock should be dipped for a few seconds in water kept at a temperature of 130 to 150 F., or in a warm, strong soap solution, before it is planted. Recent experiments show that finely-ground tobacco dust is very effective if placed in a small furrow along either side of nursery rows or distributed at the rate of from two to five pounds per tree for a distance of two feet from the crown, after first removing from four to six inches of soil. The tobacco dust is cheap, and has consid- erable fertilizing value. The Round-Headed Apple-Tree Borer {Saperda Candida). —This insect enters the tree and burrows into the solid wood near the surface of the earth. It is a dangerous enemy; for while only a few small holes are visible in the bark outside, it may have perforated the wood internally in all directions. Not only the apple- tree, but the quince, mountain-ash, and haw- thorn suffer greatly from the attacks of this in- sect. The parent insect is a beautiful, brown-and- white striped beetle (Fig. 215), about three- fourths of an inch long, which flies at night. It deposits its eggs in June and later in slits cut in the bark, usually near the surface of the ground. The egg-stage is said to last about twenty days. The first indication of the work of the larva is the appearance of a small round hole, made visible by the ejected dust. The young larvae tunnel under the bark and feed upon the sapwood, gradually working tlieir way upward and afterward downward. During the second season the larvae attain about. Figs. 213 and 214. Fig. 215. FIG. 216. The Round-headed
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