1. Determine Optimal Spray Threshold at Different Growth Stages Objective 1B
Jeff Gore
Mississippi State University
Sorghum – Sugarcane Aphid
Research Exchange Meeting
Dallas, TX
January 3 – 4, 2017

2. Collaborators Name Affiliation Trial Location Plant Date Spray Gordy
Texas
McCornack
Kansas
Kerns
Louisiana
Seiter
Arkansas
Buntin
Georgia
Gore
Mississippi

3. Introduction

4. Materials & Methods 3 Planting Dates at Each Location
0, 50, 125, 300, 500 Thresholds
Record Growth Stages
Harvest

5. Georgia – Buntin First Planting Date
Milk (7/22)
Milk (7/22)
SD (7/26)
SD (7/26)
Bu/A
Threshold (Aphids/Leaf)

6. Georgia – Buntin Second Planting Date
Boot (7/22)
Boot (7/22)
Bu/A
Boot (7/26)
Boot (8/1)
Threshold (Aphids/Leaf)

7. Georgia – Buntin Third Planting Date
Bu/A
10L (8/1)
Boot (8/5)
Threshold (Aphids/Leaf)

8. Louisiana – Kerns Second Planting Date
(7/7, 7/12)
7/7 - Boot
7/12 - Bloom
(7/7, 7/12)
(7/7)
Bu/A
Threshold (Aphids/Leaf)

9. Louisiana – Kerns Third Planting Date
Bu/A
Threshold (Aphids/Leaf)

10. Kansas – McCornack First Planting Date
(8/30)
(9/5)
(9/14)
Bu/A
Threshold (Aphids/Leaf)

11. Kansas – McCornack Second Planting Date
(9/5)
(8/30)
Bu/A
(9/14)
Threshold (Aphids/Leaf)

12. Texas – Gordy Early Infestation
Bu/A
Threshold (Aphids/Leaf)

13. Arkansas – Seiter First Planting Date
(7/15)
(7/20)
(8/2)
Bu/A
Threshold (Aphids/Leaf)

14. Arkansas – Seiter Second Planting Date
Boot (7/18)
Boot (7/18)
Boot (7/20)
Bu/A
Bloom (7/26)
Threshold (Aphids/Leaf)

15. Arkansas – Seiter Third Planting Date
Bu/A
Threshold (Aphids/Leaf)

16. Key Learnings Sugarcane Aphid is HELL to work with
Stage specific thresholds may or may not be possible
Population dynamics will be very important

17. Georgia – Buntin First Planting Date
7/22
25% Yield Loss
7/26
Bu/A
Threshold (Aphids/Leaf)

18. Georgia – Buntin Second Planting Date
7/22
90% Yield Loss
Bu/A
7/26
Threshold (Aphids/Leaf)

19. Next Steps Need more accurate estimates of damage at each growth stage
All thresholds should be just before they hit exponential growth

20. Discussion