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

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

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) Milk (7/22) SD (7/26) SD (7/26) Bu/A Threshold (Aphids/Leaf)

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

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

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)

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

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

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

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

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

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

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

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 7/26 Bu/A Threshold (Aphids/Leaf)

Georgia – Buntin Second Planting Date 7/22 90% Yield Loss Bu/A 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