5 THE GRAPE ROOT-WORM. 



Page. 



Fig. 4. The grapevine flea-beetle {Haltica chalyhea) : Adult 16 



5. The rose-chafer ( Macrodactylus suhspinosus): Adult or beetle 17 



6. The redheaded Systena (Systena frontalis) : Adult or beetle 18 



7. The grapevine Colaspis (Colaspis brunnea): Adult or beetle 18 



8. The grape root- worm (Fidia viticida) : Larva and details 19 



9. The grape root-worm: Pupa and details 19 



10. The grape root- worm : Adult or beetle 20 



11. The grape root- worm: Structural parts of beetle 21 



12. Diagram showing time and development of a single individual of the 



grape root-worm under average conditions, as observed in 1909, at 

 North East, Pa 23 



13. Curve showing time and relative emergence of beetles of the grape root- 



worm from the ground in rearing cages at North East, Pa., 1909 24 



14. Curves showing variations in time of emergence of beetles of the grape 



root- worm from different kinds of soil. From rearing experiments 

 during 1909 at North East, Pa 25 



15. Curve showing time of egg deposition and relative abundance of eggs 



laid in rearing cages by beetles of the grape root- worm at North East, 



Pa. , during 1909 32 



16. Diagram showing variation in time of emergence of beetles of the grape 



root-worm during 1907, 1908, and 1909, at North East, Pa 42 



17. Temperature curves showing the daily records of the maximum and 



minimum temperature during the breeding period of 1909 at North 

 East, Pa 43 



18. Portion of the outdoor rearing shelter used in the rearing of insects at 



North East, Pa., during 1909 45 



19. Wooden-frame box with glass bottom and wire-screen cover used in 



studying the pupal stage of the grape root- worm beetle 45 



20. Earthen pot with glass cyclinder used in rearing the grape root- worm. . 46 



21. Rearing cage with glass sides used in the study of the larva of the 



grape root- worm beetle 47 



22. Earthen pot with wire-screen cover used in rearing the grape root- 



worm 48 



23. Diagram illustrating seasonal history of the grape root- worm as observed 



during 1909 at North East, Pa 49 



24. Fidiobiaflavipes, an egg-parasite of the grape root- worm: Adult and 



enlarged antenna 52 



25. Diagram showing the relation between the three generations of the 



Fidiobia parasite and the relative occurrence of eggs of the grape 

 root-worm at North East, Pa., during 1909 55 



26. Larva of an undetermined insect parasite of the eggs of the grape root- 



worm 56 



27. Lathromeris fidix, an egg-parasite of the grape root- worm: Antenna and 



forewing , 57 



28. Horse hoe used in removing the soil from beneath the trellis in vine- 



yards 61 



29. Young grapevine, unsprayed, showing extensive feeding by beetles of 



the grape root-worm. North East, Pa. , 1909 66 



30. Young grapevine sprayed with arsenate of lead against the beetles of the 



grape root- worm. North East, Pa., 1909 87 



31. A large nozzle of the cyclone type 89 



