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Optimal Spray Thresholds for Sugarcane Aphid at Different Growth Stages

This research aims to determine the optimal spray thresholds for controlling sugarcane aphid infestation at different growth stages of sorghum and sugarcane crops. The study includes multiple planting dates at various locations and records growth stages to provide accurate estimates of damage and guide future control measures.

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Optimal Spray Thresholds for Sugarcane Aphid at Different Growth Stages

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

  2. Collaborators

  3. Introduction

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

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

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

  7. Georgia – BuntinThird Planting Date 6L (7/22) 8L (7/26) Bu/A 10L (8/1) Boot (8/5) Threshold (Aphids/Leaf)

  8. Louisiana – KernsSecond 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 – KernsThird Planting Date 6-7L (7/12) Bu/A Threshold (Aphids/Leaf)

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

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

  12. Texas – GordyEarly Infestation 4L (6/3) 5-6L (6/7) Bu/A Threshold (Aphids/Leaf)

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

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

  15. Arkansas – SeiterThird Planting Date 7L (7/26) 7L (7/26) 7L (7/26) 8L (8/2) 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 – BuntinFirst Planting Date 25% Yield Loss 7/22 7/26 Bu/A Threshold (Aphids/Leaf)

  18. Georgia – BuntinSecond 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

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