246 PRODUCTIVE FARMING 



8. Tell what you can about the larval stage. 



9. Tell what you can about the pupal stage. 



10. To what forms of larvae do these terms apply : caterpillar, grub, 

 maggot, wriggler, nymph? 



11. Tell how mosquitoes develop malaria and impart it to man. 



12. Tell two differences between malarial mosquitoes and others. 



13. Tell of three 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. How are potato beetles controlled? 



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



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



25. What injury is done by the curculio 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 used? 



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



33. How do birds help farmers? 



34. How have we learned what birds are our friends? 



References. U. S. Farmers' Bulletins: 595, 799, 926, Important 

 Insecticides; 650 and 723, Scale insects; 657, Chinch Bug; 662, Apple 

 Tent Caterpillar: 668, Vine Borer; 675, Apple Tree Borer; 691, Grass- 

 hoppers; 701, Bagworm; 708, Leopard moth; 739, Cutworms; 725, 733, 

 on Wireworms; 721, Rose Chafer; 731, Army Worm; 1185, Alfalfa 

 Weevil. On household pests: 627, 658, 699, 1037, 1101 and 740; 755, 

 Birds; 766, Cabbage Worm; 1246 Peach Borers Ark. Sta. Bui. 107, 177, 

 Scale; 185, Strawberry insects. Ark. Ext. Circ. 143, Spray Calender. 



CHAPTER XXI. 



DISEASES OF PLANTS SPRAYING. 

 Diseases of Plants. There are many diseases which 

 attack plants grown in field, garden and orchard. These are 

 mainly: (1) Those produced by fungous growth of minute 

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

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



