Non-bearing use only (Belay). Current Products ... 12.8 fl oz / A (0.4 lb a.i.). Yearly Rate Limits ... Use of maximum l
Asian Citrus Psyllid Control: What can be done now to protect the next generation of trees Michael E. Rogers Associate Professor of Entomology UF / IFAS / Citrus Research and Education Center, Lake Alfred
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???
Top Priorities (Psyllid control) 1. 2. 3.
Protection of young trees Managing pesticide resistance Enhancing current psyllid control programs (CHMAs)
“Our children are our future” • Future of the Florida citrus industry?
Soil-applied systemic insecticides Current Products –Admire Pro (imidacloprid) –Platinum 75 SG (thiamethoxam) –Belay 50 WDG (clothianidin) • Non-bearing use only (Belay)
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
Can soil-applied insecticides protect citrus trees from becoming HLB infected?
Phloem penetration – D Phloem salivation - E1
Psyllid Feeding Behavior Admire Pro (Imidacloprid) (control)
• phloem salivation (pathogen inoculation) was disrupted as a result of imidacloprid application
All 3 products shown to provide similar levels of feeding disruption (reduction in pathogen transmission)
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.)
Achieving Season-Long Control Appropriate Use rates for: – Solid planting – Scattered resets – Trees of differing sizes – Anticipated duration of control?
Resets (< 3’)
1-2 yr (3-5’)
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? • 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) 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)*
* Currently Belay can only be applied to nonbearing trees
Rate per tree New 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 oz
Platinum 75 SG
0.0131 oz
0.0131 oz
0.367 oz
Belay 50 WDG
0.0229 fl oz
0.0229 fl oz
0.0457 fl oz
Season-long ACP control (example) Tree size Reset (
