. Injurious insects : how to recognize and control them . Insect pests; Insect pests. HEAD AND THORAX But if \vc oljst'r\'e tlie head of a squash liug, we find no jaws or other parts that woukl serve to chew or bite. Instead there is a stout beak, antl if we were to dissect this, we should find that it contained a tube for suclcing up plant juices or other fluids. In ad- dition, we sh(juld find in most insects of this type, two or three pairs of lancets within or close to the beak, used to puiictm-e or rasp the tissues so as to iutluce a greater flow of the juices. Insects with Ijiting mouth p
. Injurious insects : how to recognize and control them . Insect pests; Insect pests. HEAD AND THORAX But if \vc oljst'r\'e tlie head of a squash liug, we find no jaws or other parts that woukl serve to chew or bite. Instead there is a stout beak, antl if we were to dissect this, we should find that it contained a tube for suclcing up plant juices or other fluids. In ad- dition, we sh(juld find in most insects of this type, two or three pairs of lancets within or close to the beak, used to puiictm-e or rasp the tissues so as to iutluce a greater flow of the juices. Insects with Ijiting mouth parts maj' lje killed bjr cov- ering the plant on which they feed with a poison, such as lead arsenate. But insects wdtli sucking mouth parts do not eat the .surface of the plant and cannot Ije killed lay applica- tions of stomach poison. For the latter otlier remedies must be used, such as some substance that will kill the insect by corrosive action on its body. The Thorax The midcUe part of an insect's l^ody is called the thorax. Usually it has three distinct rings, or segments. On each segment is a pair of legs and on each of the last two is a pair of wings, except in the group of two-winged flies, which ha\'e only a single pair, on the middle segment. An insect's leg consists, t^iiically, of a small joint next the body, the trochanter; a large and heavy joint, the femur; a slender tibia;. 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 O'Kane, Walter Collins, b. 1877. New York : The Macmillan Company
Size: 1139px × 2195px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1912
