1. Question 6: Sorghum IPM System for SCA Management
G. David Buntin
University of Georgia
Sorghum – Sugarcane Aphid
Research Exchange Meeting
Dallas, TX
January 3 – 4, 2017

2. Project 6: Sorghum IPM Systems for SCA Management
Determine the effect of various IPM tactics in management systems on the populations and damage by sugarcane aphid in grain sorghum.
Collaborator
Name
Affiliation
Trial Location
Plant Date
Early
Late
David Buntin
University of Georgia
Griffin GA
May 16, 2016
June 16, 2016
Ali Zarrabi, Tom Royer, Kris Giles
Oklahoma State University
Lane, OK
May 5, 2016
June 20, 2016
Alana Jacobson
Auburn University
Shorter, AL
June 10, 2016
June 30, 2016
M. O. Way
Texas A&M University
Beaumont, TX --
June 28, 2016

3. Introduction Planting date, early vs late Variety resistance/tolerance
Insecticide seed treatment
Poncho or Cruiser
In-season foliar spray based on action threshold
1st: Sivanto 4 fl. oz./acre
2nd: Transform 1.5 oz/acre if needed

4. Materials & Methods Hybrid§ Poncho Seed Treatment Foliar spray regimeGA OK TX AL 1
DKS 3888 (Sus) No √ 2
Yes -- 3 4 5
DKS 3707 (Res) 6 7 8
§In Alabama Pioneer 84P80 (Sus) and Pioneer 83P17 (Res); and Cruiser seed treatment
Foliar Spray Regime:
GA, OK, TX: AThreshold of 50 aphids per leaf;
AL: AThreshold of 100 aphids per plant on 30% of plants;
2nd spray of Transform 1.0 fl. oz/A if needed.
All trials sprayed for Fall Armyworms in whorl, Prevathon (GA, OK), Intrepid (AL)

5. Dates of first, peak and last SCA numbers in early and late plantings of sorghum in 4 state trials SUS = Susceptible, RES = Resistant, IST = Seed treatment
Event-Treatment
AL-Early
AL-Late
GA-Early
GA-Late
OK-Early
OK-Late
TX-Late
1st aphid
2 Aug§
13 July
20 July
27 June
5 July
1 Aug
Last date
30 Aug
25 Aug
24 Aug
31 Aug
16 Sep
Peak SUS¶
9 Aug
16 Aug
26 July
17 Aug
11 Aug
Peak S-IST¶
Peak RES¶
16-23 Aug
4 Aug --
Peak R-IST¶
Spray SUS
10 Aug
18 Aug
28 July
12 July
3 Aug.
12 Aug-14 Sep
Spray S-IST
None*
5 Aug
24 Aug-14 Sep
Spray RES
12 Aug
19 July
Spray R-IST
*Aphids did not reach threshold level in this treatment and were not sprayed.
§Dates approximate. ¶ Peak dates from No spray plots.

6. 2016, Georgia SCA in early and late planting of susceptible (top) and resistant (bottom) sorghum with and without Poncho ST Resistance delayed Threshold, but not peak, by 1+ wk
Susceptible (DKS 3888)
Resistant (DKS 3707)

7. 2016, Georgia, SCA on early and late planting of susceptible variety (DKS 3888) sorghum, no spray, with and without Poncho Insecticide Seed Treatment (Sdtrt) Seed treatment delayed Threshold by 1 week (TX, OK also)
SCA peaked on sample date in both plantings. Insecticide seed treatment delayed SCA reaching threshold of 50 aphids per leaf by about 1 week in both planting.

8. Effect of SCA resistance, seed treatment and foliar spray on cumulative SCA aphid-days in early and late plantings in 3 state trials, 2016
Hybrid§
Seed Treat-ment
Foliar
Spray
GA-Early
GA-Late
AL-
Early
AL- Late
OK-Early
OK- Late
Susceptible No
4659a
4952a
25,422a
941c
6740a
7651a
Yes
2847b
1428b --
3346b
2023b
624c
939bc
9031b
887c
413c
259c
838c
405c
8378b
713c
167c
42c
Resistant
1018c
292c
4411bc
2839c
660c
355c
456c
220c
4072bc
1091c
63c
N/A
363c
145c
1766c
393c
14c
Means in GA and OK within planting date followed by the same letter are not significantly different (LSD α=0.05).
Means in AL followed by the same letter are not significantly different (LS means, α=0.05).

9. 2016, Georgia, Effect of planting time, variety resistance, seed treatment and foliar spray for control of SCA on number of sorghum grain heads
F = 0.72, P=0.6537ns
F = 12.47, P <0.0001
Means within planting date followed by the same letter are not significantly different, LSD α=0.05

10. Effect of Poncho seed treatment on late-planted susceptible (DKS 3888) sorghum without foliar spray, 2016 Georgia
Poncho Seed Treatment No Seed Treatment

11. Effect of Poncho seed treatment (right) on late-planted susceptible (DKS 3888) sorghum, No foliar spray, 2016 Texas

12. Effect of Poncho seed treatment (right) on late-planted Resistant (DKS 3707) sorghum, No foliar spray, 2016 Texas

13. 2016,Texas, Effect of planting time, variety resistance, seed treatment and foliar spray for control of SCA on sorghum grain heads and yield
Means within planting date followed by the same letter are not significantly different, LSD α=0.05
§Not included

14. 2016, Georgia, Effect of planting time, variety resistance, seed treatment and foliar spray for control of SCA on sorghum grain yield
F = 8.17, P <0.0001
F = 4.92, P <0.0020
Means within planting date followed by the same letter are not significantly different, LSD α=0.05

15. 2016, Alabama, Effect of planting time, variety resistance, seed treatment and foliar spray for control of SCA on sorghum grain yield
Not sprayed
F = 13.62; df=11, 33; P <0.0001
LS Means across both planting dates followed by the same letter are not significantly different, LSD α=0.05.
§Not included

16. Sorghum IPM Systems for SCA Management in Oklahoma Grain Yield of Early and Late Plantings (Ali Zarrabi, Tom Royer, Kris Giles)
Not sprayed
Means with the same letter are not
significantly different (LSD, α = 0.05).
§Not included

17. Key Learnings
SCA infestations about the same time regardless of planting date across the region.
Planting date had variable effect
later had lower yield potential.
Later had more damage
Variety tolerance/resistance delayed or prevent threshold infestations.
Seed treatment effective in susceptible variety.
Integration of variety tolerance / resistance, seed treatment and single foliar threshold spray effective in preventing damage.

18. Discussion