224 PRODUCTIVE FARMING 



11. Tell how malarial mosquitoes develop that disease and impart 

 it to man. 



12. Tell two differences between malarial mosquitoes and common 

 mosquitoes. 



13. Tell of three or more ways of preventing the spread of human 

 diseases by mosquitoes. 



14. Tell how mosquito wrigglers breathe. 



15. Describe the life development of the house fly. 



16. How do flies spread typhoid and other human diseases ? 



17. What are the remedies to be used against the fly? 



18. Tell how to prevent damage from clothes moths. 



19. Describe the damage done by grain moths. 



20. In what ways are chinch bugs injurious ? 



21. What are the different means of control? 



22. Tell of the injuries from potato beetles. How are these insects 

 controlled ? 



23. Describe the life and work of the codling-moth. 



24. Tell at just what time to spray to fight the spring brood. Why? 



25. What injury is done by the curcuho beetles ? 



26. What are some of the ways of fighting it ? 



27. Tell how the peach tree borer may be found. 



28. What are the remedies for this insect? 



29. Name two kinds of apple tree borers and tell what harm they do. 



30. Why is it so difficult to control the San Jose scale? 



31. What two materials' are used to spray the scale? When are they 

 used? 



32. Name some groups of beneficial insects, and tell of their benefits. 



References. — Leaflets of the U. S. Bureau of Entomology. U. S. 

 Farmers' Bulletins: 120, Insects Affecting Tobacco; 127, Important 

 Insecticides; 145, Carbon Bisulfid as an Insecticide; 178, Insects 

 Injurious in Cranberry Culture; 196, Usefulness of the American Toad; 

 284, Insect and Fungous Enemies of the Grape East of the Rocky 

 Mountains; 290, 314, 344, all on The Cotton Boll Weevil; 456, Our 

 Grosbeaks and Their Value to Agriculture; 459, House Flies. 



CHAPTER XX. 



DISEASES OF PLANTS— SPRAYING. 



Diseases of Plants. — There are a great many diseases 

 which attack the plants grown in field, garden, and orchard. 

 These diseases are of three main types: (1) Those which are 

 produced by a fungous growth of minute plants, on the 

 tissues of the useful plants, examples of which are rust on 

 leaves and smut on grain. (2) Those produced by bacteria, 



