236 THE GRAPE 



3. What determines the length of a grape cutting? 



4. In your opinion which is the most important method of propagating 

 the grape? Why? 



5. Why is the nature of the subsoil important in grape culture? 



6. What kind of a soil does the grape prefer? 



7. Is there any relation between the soil and the general location of a 

 vineyard? 



8. Discuss the most economical way of planting the grape. 



9. What determines the distance apart the grape must be planted? 



10. When should the cultivation of the grape begin? Why? 



11. What is meant by training of the grape? 



12. Differentiate between staking and trellising. 



13. Which method is the most economical? Why? 



14. What advantage has the stake over the other systems of training? 



15. Describe the making of a trellis. 



16. Where is the overhead system of value and why is it not commercially 

 profitable? 



17. Why is it unprofitable to pick grapes before they are fully 'ripe? 



18. When is the proper time to pick grapes? Why? 



19. Why is it unprofitable to store grapes? 



20. What determines the proper selection of varieties? 



21. Name and describe the black rot of the grape. How is it controlled? 



22. What is the difference between powdery mildew and downy mildew? 



23. Why is the grape phylloxera so destructive? 



24. How does the injury from the grape-berry moth differ from that of 

 the curculio? 



25. Give the spray outline for the grape. 



