Determine Optimal Spray Threshold at Different Growth Stages

Collaborators Name Affiliation Gordy Texas Mc. Cornack Kansas Kerns Louisiana Seiter Arkansas Buntin Georgia

Materials & Methods • 3 Planting Dates at Each Location • 0, 50, 125,

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

Georgia – Buntin Second Planting Date Boot (7/22) Bu/A Boot (7/22) Boot (7/26) Threshold

Georgia – Buntin Third Planting Date 8 L (7/26) Bu/A 6 L (7/22) 10

Louisiana – Kerns Second Planting Date Bu/A (7/7, 7/12) 7/7 - Boot 7/12 -

Louisiana – Kerns Third Planting Date Bu/A 6 -7 L (7/12) Threshold (Aphids/Leaf)

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

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

Texas – Gordy Early Infestation 4 L (6/3) Bu/A 5 -6 L (6/7) Threshold

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

Arkansas – Seiter Second Planting Date Boot (7/18) Boot (7/20) Bu/A Boot (7/18) Bloom

Arkansas – Seiter Third Planting Date 7 L (7/26) Bu/A 7 L (7/26) Threshold

Key Learnings • Sugarcane Aphid is HELL to work with • Stage specific thresholds

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

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

Next Steps • Need more accurate estimates of damage at each growth stage •

Slides: 20

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

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

Introduction

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

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

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

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

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

Louisiana – Kerns Third Planting Date Bu/A 6 -7 L (7/12) Threshold (Aphids/Leaf)

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

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

Texas – Gordy Early Infestation 4 L (6/3) Bu/A 5 -6 L (6/7) Threshold (Aphids/Leaf)

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

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

Arkansas – Seiter Third Planting Date 7 L (7/26) Bu/A 7 L (7/26) Threshold (Aphids/Leaf) 8 L (8/2)

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

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

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

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

Discussion