Management on Soybean Cyst. Density. Valerie A. Mock J. Earl Creech William G. Johnson

Transcription

1 Effect of Winter Annul Weed Mngement on Soyben Cyst Nemtode Popultion nd Weed Density Vlerie A. Mock J. Erl Creech Willim G. Johnson

2 Soyben Cyst Nemtode (SCN) Endoprsitic roundworm Cysts cn produce up to 600 eggs Cn complete lifecycle in 28 dys under optiml field conditions Reported in 82 of 92 counties in Indin* Yield loss * Fghihi, J., nd V.R. Ferris

3 Winter Annul Weeds

4 Winter Annul Weed Hosts Purple dednettle Henbit Field pennycress Shepherd s-purse Common chickweed Smllflowered bittercress

5 Cool Seson Perennil Host Mouseer chickweed

6 SCN nd Winter Annul Weeds Winter nnul weed survey Indin fields with SCN were smpled - Found 93% of fields hd winter nnul weed hosts Field experiment: SCN cn complete its lifecycle on purple dednettle. 2 Growth chmber experiment: Juveniles survived periods of cold temperture in roots nd continued development when tempertures wrmed. 3 1 Creech, J.E., nd W.G. Johnson Weed Tech. 20: Creech, J.E., W.G. Johnson, J.Fghihi, V.R. Ferris, nd A. Westphl Crop Mngement. 3 Creech, J.E., J.B. Sntini, S.P. Conely, A. Westphl, nd W.G. Johnson Weed Science. 55:

7 SCN Mngement Crop rottion with non-host crop SCN-resistnt soyben Weed mngement??

8 Objective To determine if winter nnul weed densities nd SCN popultion densities cn be reduced by using winter cover crops or herbicides.

9 Mterils & Method s Experiment estblished in 2003 ( ) 2 loctions - Northern site - W. Lfyette Chlmers silty cly lom Low weed density nd SCN - Southern site - Vincennes Ptton silt lom High weed density nd SCN West Lfyette Vincennes

10 Mterils & Method s 2 crop rottions -Soyben - soyben - Soyben - corn 6 weed mngement tctics: - Untreted - Spring + fll glyphoste tretments (Weed free) - Spring glyphoste tretment - Fll glyphoste gy tretment - Whet cover crop - Annul ryegrss cover crop (ARG)

11 Dt collection SCN egg counts - Spring nd fll Sieving nd decnting* Weed counts - Fll Spring Qudrts nemtology.umd.edu/scn.html (McGwley) * Fghihi, J., nd J.M. Ferris J. Nemtol. 32:

12 Dt nlysis PROC MIXED - Loctions nlyzed seprtely - All dt were log trnsformed - Mens seprted t P= Bck-trnsformed mens will be presented for clrity

13 Northern SCN egg counts (no. / 100 cc of soil) Weed mgmt. Untreted Whet ARG Fll 06 (F) F + S Spring (S) Weed mngement * rottion * seson Spring P= S (C)* Fll Spring S (S) Fll no. / 100 cc of soil * Spring 2007 corn plnted

14 Northern SCN egg counts (no. / 100 cc of soil) Weed mgmt. Untreted Whet ARG Fll 06 (F) Weed mngement * rottion * seson Spring P= S (C)* Fll Spring S (S) Fll no. / 100 cc of soil 0 b 6 b 4 b 11 b F + S 4 b Spring (S) 16 * Spring 2007 corn plnted

15 Northern SCN egg counts (no. / 100 cc of soil) Weed mgmt. Weed mngement * rottion * seson Spring P= S (C)* Fll Untreted 0 b 10 Whet 6 b 0 ARG 4 b 4 Fll 06 (F) 11 b 1 F + S 4 b 5 Spring (S) 16 0 Spring S (S) Fll no. / 100 cc of soil * Spring 2007 corn plnted

16 Northern SCN egg counts (no. / 100 cc of soil) Weed mgmt. Weed mngement * rottion * seson Spring P= S (C)* Fll Spring S (S) Fll no. / 100 cc of soil Untreted 0 b 10 1 Whet 6 b 0 2 ARG 4 b 4 4 Fll 06 (F) 11 b 1 2 F + S 4 b 5 2 Spring (S) * Spring 2007 corn plnted

17 Northern SCN egg counts (no. / 100 cc of soil) Weed mgmt. Weed mngement * rottion * seson Spring P= S (C)* Fll Spring S (S) Fll no. / 100 cc of soil Untreted 0 b b Whet 6 b b ARG 4 b b Fll 06 (F) 11 b F + S 4 b b Spring (S) b * Spring 2007 corn plnted

18 SCN Conclusions S(C) rottion in spring - Higher SCN egg counts in spring timing thn untreted - SCN eggs my hve htched in untreted plots S(S) rottion in the fll - Higher SCN in fll timing thn untreted - Winter nnul weeds my serve s trp crop Cover crops not effective in reducing SCN popultions

19 60 Spring weed counts (Northern) r m 2 Weed ds pe Unt. ARG Whet Fll gly.

20 r m 2 Weed ds pe Spring weed counts (Northern) b b c Unt. ARG Whet Fll gly.

21 60 Spring weed counts (Northern) r m Weed ds pe b Unt. ARG Whet Fll gly.

22 60 Spring weed counts (Northern) r m 2 Weed ds pe b b Unt. ARG Whet Fll gly.

23 60 Spring weed counts (Northern) r m 2 Weed ds pe b b b b c Unt. ARG Whet Fll gly.

24 240 Spring weed counts (Southern) r m 2 Weed ds pe Unt. ARG Whet Fll gly.

25 r m 2 Weed ds pe Spring weed counts (Southern) b Unt. ARG Whet Fll gly.

26 240 Spring weed counts (Southern) r m 2 Weed ds pe b c Unt. ARG Whet Fll gly.

27 240 Spring weed counts (Southern) r m 2 Weed ds pe b b b c c Unt. ARG Whet Fll gly.

28 240 Spring weed counts (Southern) r m 2 Weed ds pe b b b b c c c Unt. ARG Whet Fll gly.

29 Spring Weed Count Conclusions Fll glyphoste tretments provide better weed suppression thn cover crops. Annul ryegrss nd whet did not reduce SCN winter weed hosts. Winter weed hosts seem to compete better thn the non-hosts with nnul ryegrss nd whet.

30 Future Reserch To determine if winter nnul weeds cn: - Stimulte erlier egg htch in spring - Serve s trp crops in the field - Increse soil microbes tht suppress SCN

31 Questions??