. Manual of fruit insects. bdomen consists of from ten to twelve segments. Inmany species thetip in the femaleis provided with asharp lancelike orsaw-edged oviposi-tor, with which shepunctures the tissueof plants and in-serts her eggs in thewound so made (seeFig. 317, p. 358). How insects feed. The mouth partsof insects areadapted for feedingon all sorts of tissue, from the tender leaves and ripening fruitto the solid wood itself. From the standpoint of control it is ofgreat importance to know just how each insect obtains its food. For the purpose of control insects may be roughly dividedinto
. Manual of fruit insects. bdomen consists of from ten to twelve segments. Inmany species thetip in the femaleis provided with asharp lancelike orsaw-edged oviposi-tor, with which shepunctures the tissueof plants and in-serts her eggs in thewound so made (seeFig. 317, p. 358). How insects feed. The mouth partsof insects areadapted for feedingon all sorts of tissue, from the tender leaves and ripening fruitto the solid wood itself. From the standpoint of control it is ofgreat importance to know just how each insect obtains its food. For the purpose of control insects may be roughly dividedinto three classes as follows : 1. Chewing insects: Beetles and caterpillars belong are provided with hard horny jaws or mandibles withwhich they bite off and swallow portions of the tissue of plantsas shown in Figure 2. It is usually possible to kill such insectsby poisoning their food with an arsenical. 2. Sucking insects: Plant lice and other true bugs arefurnished with a beak containing four bristles united into a. Fig. 2. A caterpUlar feeding, showing the bitingtype of mouth parts. FRUIT INSECTS slender tube. In feeding, the tip of the beak is applied to thesurface of the plant, the bristles are inserted into the tissue and the plant juices are suckedout (Fig. 3). Contact insec-ticides must be used againstthis class. 3. Lapping insects: In thefruit flies the mouth partsare developed into a tongue-like organ with which theinsect is able to lap or lickup liquids (Fig. 4). Arsenicalpoisons have been used suc-cessfully for the control ofthis class of insects. In different stages of itsdevelopment the same insectmay have different kinds ofmouth parts, and may feed Fig. plant-louse feeding, show- o^ entirely different foods;ing the sucking type of mouth parts, for instance, caterpillars have From a German drawing. , .,. ,, , , bitmg mouth parts and mayfeed on leaves, while the adults, moths,have sucking mouth parts with whichthey extract the nectar from flowers. How in
Size: 1788px × 1398px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbenefic, bookyear1915
