evaluation of insecticide efficacy against sugarcane aphid

Evaluation of Insecticide Efficacy Against Sugarcane Aphid

BRITTANY LIPSEYMISSISSIPPI STATE UNIVERSITY

SORGHUM – SUGARCANE APHID RESEARCH EXCHANGE MEETINGNEW ORLEANS, LAJANUARY 7 – 8, 2016

Collaborators

Name Affiliation Trial Location PlantDate

Spray Date

Brittany Lipsey Mississippi State University Starkville, MS NA 8/5/15

Angus Catchot Mississippi State University Starkville, MS NA 8/5/15

Jeff Gore Mississippi State University Starkville, MS NA 8/5/15

Introduction Evaluate the effects of temperature on efficacy of sulfoxaflor and flupyradifurone against sugarcane aphids in grain sorghum

Materials & MethodsField: RCBD Sprayed in field

◦ Tractor Mounted Sprayer◦ 65 PSI, 10 GPA, TX6 nozzles

Lab: Completely randomized design with a factorial arrangement of treatments◦ Factor A= Treatment (Sulfoxaflor, Transform (1oz.) & flupyradifurone Sivanto 4oz.◦ Factor B= Temperature (85 and 60 F)

10 Leaf disks were cut from the first leaf under the flag leaf at 6 intervals after treatment :

◦ 0 HAT, 24 HAT, 3 DAT, 5 DAT, 7 DAT,10 DAT

Each disk was infested with 5 adult wingless aphids and randomly separated into temperatures.

◦ 5 leaf disks tested at 60°F ◦ 5 leaf disks tested at 85°F

Morality was rated 48 hrs. after infestation.

0 Hours 24 Hours 3 Days 5 Days 7 Days 10 Days0

20

40

60

80

100

120

AB B

B

B A

AA

A

A

A

A

Efficacy of Sulfoxaflor at 60 and 85 Degrees Fahrenheit

Time After Treatment

Perc

ent M

orta

lity

Data Slides

* P < = 0.05, data corrected for check mortality

0 Hours 24 Hours 3 Days 5 Days 7 Days 10 Days0

20

40

60

80

100

120

AB

B

B B

A

AA

AA

A

Efficacy of Flupyradifurone at 60 and 85 Degrees Fahrenheit

Time After Treatment

Perc

ent M

orta

lity

BB

* P < = 0.05, data corrected for check mortality

Data Slides

0 Hours 24 Hours 3 Days 5 Days 7 Days 10 Days0

102030405060708090 A

AA

A

BB

A

AA

A

AA

Sulfoxaflor Flupyradifurone

Time After Treatment

Perc

ent M

orta

lity

* P < = 0.05, data corrected for check mortality

Data SlidesResidual Efficacy of Sulfoxaflor and Flupyradifurone

Averaged Across Both Temperatures

Key Learnings Efficacy decreases in lower temperatures with both insecticides.

Growers will likely experience unsatisfactory control of sugarcane aphids during periods of cooler temperatures

During the 2015 growing season, there were a total of 53 days from June - October 18 with temperatures below 70 degrees Fahrenheit and 23 days with temperatures below 60 degrees Fahrenheit.

More northern latitudes are more likely to spray for SCA at lower temperatures.

Flupyradifurone provided greater residual control than sulfoxaflor.

Next Steps Repeat in 2016 Look at efficacy during temperature variants during a 10 day period Example: 60 degrees for 3 days then 85 for 7 etc.

Discussion