CONTENTS. 



' Page. 



Introduction 57 



General appearance of the sugar-beet web worm and nature of attack 58 



Life history and habits 59 



Character of injury 61 



Natural enemies 62 



Other checks 63 



Experiments with remedies 63 



Spraying machinery 66 



Cost of spraying 69 



Conclusion 70 



ILLUSTRATIONS 



Page. 



Fig. 9. The sugar-beet web worm (Loxostege sticticalis) : Moth 58 



10. The garden webworm (Loxostege similalis): Moth, larva, pupa, details. 58 



11. A medium-sized sugar-beet plant defoliated by the sugar-beet web- 



worm in July 60 



12. Sugar beets defoliated by the sugar-beet webworm in July 61 



13. Large sugar-beet plants, showing defoliation and weakened roots due 



to attack by the sugar-beet webworm in August 62 



14 . Field of young sugar beets destroyed by the sugar-beet webworm in June . 63 



15. Barrel sprayer suitable for use against the sugar-beet webworm 64 



16. Barrel sprayer in action against the sugar-beet webworm 65 



17. Four-row attachment for beet sprayer 67 



18. Four-row attachment for beet sprayer 67 



19. Four-row attachment for beet sprayer 67 



20. Geared traction sprayer suitable for use against the sugar-beet web- 



worm 68 



21. Geared traction sprayer in action against the sugar-beet webworm 68 



22. Filling a traction sprayer for spraying against the sugar-beet webworm . . 69 



23. Type of Vermorel nozzles suitable for spraying sugar beets against the 



sugar-beet webworm 59 



in 



