xxii List of Illustrations 



PIGUBB PAQB 



13. Common type of punch ticket 169 



14. The HeUer tally card . . . . '. . .170 



15. The Wallace Berry Picking Record, daily ticket . . 171 



16. The Wallace Berry KcMng Record, weekly ticket . 173 



17. Leaf-spot, or rust 271 



18. Work of the weevil 272 



19. Adult weevil. (Figs. 18, 19 and 20 after F. H. Chit- 



tenden, Bureau of Entomology, U. S. Dept. of Agri- 

 culture.) 273 



20. White grub 274 



21. Root-louse. (After E. D. Sanderson, Delaware Ex- 



periment Station.) 275 



22. Injury from slugs 277 



