THE ECONOMIC BIOLOGY OF INVERTEBRATES 477 



INSECTICIDES 



Chewing insects. May be poisoned in food. 



Larvae of lepidoptera and coleoptera. 



Currant worm and apple worm. 



Potato beetle and larvae. 



All other "worms," beetles, and "grubs." 

 Sucking insects. Must be killed by contact poisons. 



Plant lice, aphids. 



Scale insects. 



True bugs (heteroptera). 

 For chewing insects use digestive poisons, such as 



Paris green. 



Arsenats of lead. 



Hellebore. 

 For sucking insects use contact poisons, such as 



Whale oil soap \ forlice> 



Kerosene emulsion ; 



Lime-sulphur wash for scale insects. 

 For apples use, 



2-3 Ib. arsenate of lead, 1 gal. lime-sulphur, 50 gallons water. 

 For peach, plum, cherry, etc., use, 



2. Ib. arsenate of lead, \ gal. lime-sulphur, 50 gallons of water. 

 For winter spraying use one part lime-sulphur to eight water. 



FUNGICIDES 



Use for blight, mould, rust, rot, or scab the following: 



Bordeaux mixture. 



Dilute lime-sulphur wash, as follows: 

 For apples, pears, etc., 



\.\ lime sulphur to 50 gallons water. 

 For plum, cherry, peach, 



\ gallon lime-sulphur to 50 gallons of water. 



COLLATERAL READING 



Economic Zoology, Osborne, pp. 1-300; Insects Injurious to Fruits, 

 Saunders, see index; Insect Pests of Farm, Garden and Orchard, Sanderson, 

 see index; Economic Entomology, Smith, see index; Shell Fish Industry, 

 Kellogg, see index; Essentials of Biology, Hunter, Coral, p. 210; Worms, 

 pp. 215-219; Insects, pp. 261-265; Lobster, 228; Molluscs, pp. 269-271; 

 Elementary Biology, Peabody and Hunt, Bees (A. B.), p. 42; Insects (A. B.), 

 pp. 13-22; Crustacea (A. B.), p. 162; Protozoa (A. B.), p. 173; Applied 

 Biology, Bigelow, Protozoa, po. 312-316; Worms, pp. 340-345, 350; 

 Crustacea, p. 372; Insects, pp. 390-398; Vegetable Mould and Earthworms t 

 Darwin, Chap. VII; New York State Museum Bulletin, No. 103 and other 

 N. Y. State Bulletins; Cornell University College of Agriculture, Bui- 



