Asian Citrus Psyllid Control:
What can be done now to protect the next generation of trees
Asian Citrus Psyllid Control:
What can be done now to protect the next generation of trees
Michael E. RogersAssociate Professor of Entomology
UF / IFAS / Citrus Research and Education Center, Lake Alfred
Michael E. RogersAssociate Professor of Entomology
UF / IFAS / Citrus Research and Education Center, Lake Alfred
IMPORTANCE OF PSYLLID CONTROL
IMPORTANCE OF PSYLLID CONTROL
• General agreement that psyllid control will remain an important component of HLB management programs for the foreseeable future
• What are the most important psyllid control considerations???
• General agreement that psyllid control will remain an important component of HLB management programs for the foreseeable future
• What are the most important psyllid control considerations???
Top Priorities (Psyllid control)
Top Priorities (Psyllid control)
1. Protection of young trees2. Managing pesticide resistance3. Enhancing current psyllid control
programs (CHMAs)
1. Protection of young trees2. Managing pesticide resistance3. Enhancing current psyllid control
programs (CHMAs)
“Our children are our future”“Our children are our future”• Future of the Florida citrus industry?• Future of the Florida citrus industry?
Soil-applied systemic insecticides
Soil-applied systemic insecticides
Current Products–Admire Pro (imidacloprid)–Platinum 75 SG (thiamethoxam)–Belay 50 WDG (clothianidin)
• Non-bearing use only (Belay)
Current Products–Admire Pro (imidacloprid)–Platinum 75 SG (thiamethoxam)–Belay 50 WDG (clothianidin)
• Non-bearing use only (Belay)
Soil-applied systemic insecticides
Soil-applied systemic insecticides
Important Benefits
– Long-lasting systemic (whole tree) protection
– Control both psyllid and leafminer– disrupt psyllid feeding greatly
reducing HLB pathogen transmission
Important Benefits
– Long-lasting systemic (whole tree) protection
– Control both psyllid and leafminer– disrupt psyllid feeding greatly
reducing HLB pathogen transmission
Can soil-applied insecticides protect citrus trees from becoming HLB infected?
Can soil-applied insecticides protect citrus trees from becoming HLB infected?
Phloem Phloem penetration penetration –– DD
Phloem salivation Phloem salivation -- E1E1
Psyllid Feeding Behavior Admire Pro (Imidacloprid)
Psyllid Feeding Behavior Admire Pro (Imidacloprid)
• phloem salivation (pathogen inoculation) was disrupted as a result of imidacloprid application
(control)
Psyllid Feeding BehaviorPsyllid Feeding Behavior
• Admire Pro 4.6F• Platinum 75 SG• Belay 50 WDG
All 3 products shown to provide similar levels of feeding disruption (reduction in pathogen transmission)
Soil-applied systemic insecticides
Soil-applied systemic insecticides
Yearly Rate Limits
–Admire Pro (imidacloprid)• 14 fl oz / A (0.5 lb a.i.)
–Platinum 75 SG (thiamethoxam)• 3.67 oz / A (0.172 lb a.i.)
–Belay 50 WDG (clothianidin)• 12.8 fl oz / A (0.4 lb a.i.)
Yearly Rate Limits
–Admire Pro (imidacloprid)• 14 fl oz / A (0.5 lb a.i.)
–Platinum 75 SG (thiamethoxam)• 3.67 oz / A (0.172 lb a.i.)
–Belay 50 WDG (clothianidin)• 12.8 fl oz / A (0.4 lb a.i.)
Achieving Season-Long ControlAchieving Season-Long Control
Appropriate Use rates for:– Solid planting– Scattered resets– Trees of differing sizes– Anticipated duration of control?
Appropriate Use rates for:– Solid planting– Scattered resets– Trees of differing sizes– Anticipated duration of control?
Resets (< 3’)Resets (< 3’) 1-2 yr (3-5’)1-2 yr (3-5’)
3-5+ yr (5-9’)3-5+ yr (5-9’)
No consistent efficacy (tree to tree) at high rate until 36 DAT;High rate no longer effective 66 DAT
Platinum works slightly faster providing efficacy 30 DAT; all products providing efficacy 36 DAT; no longer effective 66 DAT.
What to Expect?What to Expect?• Young trees (up to 5’ height)
– Takes about 2 weeks after soil-drench applications made to get consistent control
– Control should last about 60 days after application made
• Older trees (5 to 9’ height)– Use of maximum labeled rate needed for one
application – Requires up to 30+ days for control;
expect only 30 days of subsequent control (60 DAT)
• Young trees (up to 5’ height)– Takes about 2 weeks after soil-drench
applications made to get consistent control– Control should last about 60 days after
application made• Older trees (5 to 9’ height)
– Use of maximum labeled rate needed for one application
– Requires up to 30+ days for control; expect only 30 days of subsequent control (60 DAT)
Rate per acre (single application) (based on 140 trees / A) Rate per acre (single application) (based on 140 trees / A)
New Reset (2-3’ height)
1-2 yrs(3-5’ height)
3-5+ yrs(5-9’ height)
Admire Pro 4.6F 3.5 fl oz (4 apps) 7 fl oz (2 apps) 14 fl oz (1 app)Platinum 75 SG 1.835 oz (2 apps) 1.835 oz (2 apps) 3.67 oz (1 app)Belay 50 WDG 3.2 fl oz (4 apps) 3.2 fl oz (4 apps) 6.4 fl oz (2 apps)*
Rate per treeRate per treeNew Reset
(2-3’ height)1-2 yrs
(3-5’ height)3-5+ yrs
(5-9’ height)Admire Pro 4.6F 0.025 fl oz 0.05 fl oz 0.1 fl ozPlatinum 75 SG 0.0131 oz 0.0131 oz 0.367 ozBelay 50 WDG 0.0229 fl oz 0.0229 fl oz 0.0457 fl oz
* Currently Belay can only be applied to nonbearing trees
Season-long ACP control (example)
Season-long ACP control (example)
Tree size
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Reset(<3’) P A B B A P
1-2 yr(3-5’) P A B B A P3-5 yr(5-9’)Non-
bearing
P A B B
3-5 yr (5-9’)
bearingP A
A = Admire Pro 4.6 F; B = Belay 50 WDG; P = Platinum 75 WG
* Rates per acre per tree size based on results from trials presented in previous slides
Season-long ACP control (example)
Season-long ACP control (example)
Tree size
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Reset(<3’) P A B B A P
1-2 yr(3-5’) P A B B A P3-5 yr(5-9’)Non-
bearing
P A B B
3-5 yr (5-9’)
bearingP A
A = Admire Pro 4.6 F; B = Belay 50 WDG; P = Platinum 75 WG•Rates per acre per tree size based on results from trials
presented in previous slides Foliar sprays utilizing non-neonicotinoid insecticides.
Weeds compete for your soil- applied insecticides!!!
Weeds compete for your soil- applied insecticides!!!
Managing Pesticide ResistanceManaging Pesticide Resistance• Always rotate modes of
action! –Primary means of preventing
future product failures
• Always rotate modes of action!–Primary means of preventing
future product failures• What about tank mixes???
–Pre-packaged product mixtures
Tank mixesTank mixes• Primary ACP control
products – Danitol– Mustang– Imidan– Dimethoate– Lorsban– Malathion– Delegate– Actara*– Provado*
• Primary ACP control products– Danitol– Mustang– Imidan– Dimethoate– Lorsban– Malathion– Delegate– Actara*– Provado*
• Secondary ACP control products – Agri-mek– Micromite– Movento– Portal– Petroleum oil
• Secondary ACP control products– Agri-mek– Micromite– Movento– Portal– Petroleum oil
+
Avoid tank mixing two primary ACP control products
Season-long ACP control (young tree example)
Season-long ACP control (young tree example)
Tree size
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Reset(<3’) P A B B A P
1-2 yr(3-5’) P A B B A P3-5 yr(5-9’)Non-
bearing
P A B B
3-5 yr (5-9’)
bearingP A
A = Admire Pro 4.6 F; B = Belay 50 WDG; P = Platinum 75 WG•Rates per acre per tree size based on results from trials
presented in previous slides Foliar sprays utilizing non-neonicotinoid insecticides.
Enhancing Current Psyllid Control Programs (CHMAs) Enhancing Current Psyllid Control Programs (CHMAs)
• Coordinate timing of pesticide applications – Reduce overall psyllid populations– Cut down on cost and number of pesticide
applications needed to stay productive • Coordinate mode of actions used
– Managing pesticide resistance by minimizing repeated exposure to same MOA
• Coordinate timing of pesticide applications– Reduce overall psyllid populations– Cut down on cost and number of pesticide
applications needed to stay productive• Coordinate mode of actions used
– Managing pesticide resistance by minimizing repeated exposure to same MOA
http://www.flchma.orghttp://www.flchma.org
County CHMA Citrus acreageBrevard, Orange, Lake, Seminole, Volusia, Osceola
Central Lake / North OrangeGreen Swamp
North Lake / South MarionSouth Lake / West Orange
Seminole / East OrangeVolusia CHMABrevard CHMAOsceola CHMA
6,2867,8564,7115,6651,9931,7718,29212,079
Polk, Hillsborough Auburndale / Lake AlfredBabson Park
Bereah / South FrostproofFt. Meade / Alturas
HesperidesLakeland Highlands
Mountain Lake / DundeeNE Polk
The Green SwampSouth Hillsborough
4,99115,79212,37821,1695,2521,4579,0869,1103,1156,252
Highlands, Desoto,Hardee
Avon Park / Lake LettaBairs Den
Central Highlands 17/27East 70 Flatwoods
Kissimmee River BasinLake Letta / Sebring
NE DesotoNE HardeeNW HardeeSW HardeeSE Hardee
10,52913,2507,8355,4299,7216,60827,38514,71112,97011,80913,492
Lee, Hendry, Glades, Collier, Charlotte
Gulf CHMA 153,226
Current Number of defined CHMAs: 30 Total acres: 424,220
AcknowledgementsAcknowledgements
Special thanks to the CRDF and growers for funding support!!!
Additional Questions:[email protected]
Special thanks to the CRDF and growers for funding support!!!
Additional Questions:[email protected]
