Horticulture, a text book for high schools and normals, including plant propagation; . s; forexample, with apple worms and plum curculio insects this princi-ple applies. It is necessary that the poison be on the surface readyfor the insect to get his first mouthful, otherwise spraying wouldbe too late. To Fight Sucking Insects.—By sucking insects we mean thosewhich take their food in the form of juices through sucking tubeswhich they insert below the surface of the leaves, fruit or stems. CONTACT INSECTICIDES 313 Plant lice are sucking insects which attack many plants (Fig. 219).It is evident
Horticulture, a text book for high schools and normals, including plant propagation; . s; forexample, with apple worms and plum curculio insects this princi-ple applies. It is necessary that the poison be on the surface readyfor the insect to get his first mouthful, otherwise spraying wouldbe too late. To Fight Sucking Insects.—By sucking insects we mean thosewhich take their food in the form of juices through sucking tubeswhich they insert below the surface of the leaves, fruit or stems. CONTACT INSECTICIDES 313 Plant lice are sucking insects which attack many plants (Fig. 219).It is evident that insects obtaining their food from the inside ofthe plants can not be poisoned in the same way that we wouldpoison those eating the suiface. An entirely different plan of com-bating such insects must be used. Contact sprays are means that the spray material must come directly in contactwith the bodies of the insects in ortler to kill them. Contact Insecticides.—Among the contact insecticides are thesoluble or miscible oils, lime-sulfur compounds, soap mixtures,. Fig. 21S. -Canker worms feed on apple blossoms and on the leaves,arsenate of lead. (Ohio Station.) Spray promptly with resinous emulsions, kerosene emulsion and crude oil and nicotine sulfate may also be used as contact , tobacco dust, road dust and other materials are some-times used. Kerosene emulsion is one of the oldest and one of the mosteffective home-made remedies for sucking insects. It is used com-monly in fighting plant lice and all sucking insects with soft bodies. Prepare a soap solution of kerosene emulsion by using laundrysoap, one-half pound, two gallons kerosene and one gallon of water. 314 PRINCIPLES OF SPRAYING Shave up the soap in the water while boihng hot. As soon as thesoap is all dissolved remove from the fire and mix it with the twogallons of kerosene. Shake this mixture thoroughly for fifteenminutes. If you have a bucket pump use that in
Size: 1778px × 1406px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectgardeni, bookyear1922
