. Elementary agriculture. Agriculture. INSECTS 63 insecticides. Insects do not breathe through their noses or mouths, but they have little holes, or pores placed along both sides of their bodies, and through these the air passes in and out. When anything clogs these breathing pores, they die. It has been found that certain oils and powders will destroy in- sects by smothering them. Oils may be mixed with. Courtesy U. S. Dept. of Agriculture Fig. 39. Apples from trees that were sprayed. No farmer can afford to neglect his fruit crop. other materials so as to prevent damage to the plants on whic
. Elementary agriculture. Agriculture. INSECTS 63 insecticides. Insects do not breathe through their noses or mouths, but they have little holes, or pores placed along both sides of their bodies, and through these the air passes in and out. When anything clogs these breathing pores, they die. It has been found that certain oils and powders will destroy in- sects by smothering them. Oils may be mixed with. Courtesy U. S. Dept. of Agriculture Fig. 39. Apples from trees that were sprayed. No farmer can afford to neglect his fruit crop. other materials so as to prevent damage to the plants on which the insects live. Kerosene emulsion is such an insect destroyer. Poisons may be put on the plants before insects appear as a protection, but contact insecticides must be applied to the insects themselves. Moulting of Insects. Insects have no bones or inside skeleton, but the skin becomes very hard and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Nida, William Lewis. Chicago, A. Flanagan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
