USDA Weed Science from UIUC

1. Using matrix population models to inform biocontrol agent selection for garlic mustard ( Alliaria petiolata ) Dr. Adam S. Davis USDA-ARS Invasive Weed Management Unit University of Illinois Department of Crop Sciences Urbana, IL

3. Garlic mustard (Alliaria petiolata)

4. first record, Long Island 1868 http://plants.usda.gov/java/profile?symbol=ALPE4 Current distribution

8. Drayton & Primack,1999 Rejmanek, 2000 census time = late spring, prior to seed dispersal

9. Drayton & Primack,1999 Rejmanek, 2000 n s n r n p n t =

10. A =

11. n t+1 = A * n t n s n r n p n t = A =

12. Elasticity analysis n t+1 = A * n t (Caswell, 2001) what are consequences of proportional changes in population growth rate? elasticity of  to lower level parameters

13. Literature values for A. petiolata

14. Davis et al. 2006 Ecol. Apps. 16: 2399-2410. s r s rf f g 1 g 2 s s

15. Ceutorhynchus scrobicollis : Feeding niche : root, root crown, shoot base Damage types : direct mortality, reduced fecundity Feeding period : Sept.-May Blossey et al., 2001 Photo: Hariet Hinz and Esther Gerber

16. Photos: Hariet Hinz & Esther Gerber C. scrobicollis damage

17. Ceutorhynchus alliariae : Feeding niche : stem and petioles Damage types : reduced fecundity, reduced plant size Feeding period : April-May Blossey et al., 2001 - Photos: Hariet Hinz & Esther Gerber

18. Ceutorhynchus constrictus : Feeding niche : seed Damage types : reduced fecundity Feeding period : April-May Blossey et al., 2001 Photo: Hariet Hinz & Esther Gerber

20. Zero growth isoclines Davis et al. 2006

21. Davis et al., 2006

22. Current field work

23. Evans, 2006

26. Photo: J. Evans Photo: Raghu

29. Fecundity (seeds plant -1 ) Elasticity of  to x

30. Reduction in seed output (%) Rosette mortality(%) M2 I2, I3 M5, M6 M3 M7 I3 M1 M8 M4 I1 I5

33. Development of spatially-referenced functions for describing density dependence of Alliaria petiolata demography logistic regression of s rf on binned data reference plant t 0 t 1

34. Density dependent rosette survival to reproductive maturity Odds ratio of rosette survival * *with respect to seedlings per distance bin

35. Y = 1.06*e -0.0087*X R 2 = 0.68, P<0.05,  0 NS P(Survive 1yr) Population density t 0 (plants m -2 ) Density dependent rosette survival to reproductive maturity

36. Y = 1440*e -0.014*X R 2 = 0.84, P<0.05,  0 NS Fecundity (seeds plant -1 ) Population density t 0 (plants m -2 ) Density dependent fecundity ***** The damage to reproductive output due to density is set up in the previous growing season. Over- crowded rosettes do not recover as ranks thin!

37. Y = 0.218*e -0.0003*X R 2 = 0.08, P<0.05,  0 NS P(Survive to rosette) Population density t 0 (plants m -2 ) Density dependent seedling survival to rosette stage

38. Y = 0134.*e -0.00014*X R 2 = 0.99, P<0.05,  0 NS P(Survive to rosette) Population density t 0 (plants m -2 ) Density dependent seedling survival to rosette stage, IP

39. Y = 0.30*e -0.0003*X R 2 = 0.99, P<0.05,  0 NS P(Survive to rosette) Population density t 0 (plants m -2 ) Density dependent seedling survival to rosette stage, H

40. Y = 1954*e -0.0024*X R 2 = 0.40, P<0.05,  0 NS PAR Mar 7 (umol m -2 ) Population density t 0 (plants m -2 ) Light-mediated seedling recruitment