Contents xxi 



CHAPTER XXII 



PAGE 



FAMILY UMBELLIFER^E 354 



Diseases of the Carrot 

 Diseases of the Celery 

 Diseases of the Parsley 

 Diseases of the Parsnip 

 Weeds 



PART IV 



CHAPTER XXIII 

 METHODS OF CONTROL 361 



CHAPTER XXIV 

 CONTROL OF INSECT PESTS BY NATURAL FACTORS 375 



CHAPTER XXV 

 TREATMENT OF FENCE POSTS . . . .378 



GLOSSARY 381 



INDEX 387 



