Email Print Site Map
KAC Citrus Entomology
University of California
KAC Citrus Entomology

Initial Eradication Strategy

ACP Treatment Approach

Principles for treating commercial citrus orchards with first appearance of ACP: 

  1. Apply two ACP effective insecticides (see Table below) with different mode of actions as soon as possible after detection of ACP, with at least one from the broad spectrum group.  The best treatment combination is a foliar pyrethroid (Baythroid, Danitol, Tombstone, or Mustang) + a systemic neonicotinoid (Admire Pro or generic imidacloprid, Platinum). Apply the foliar first for rapid knockdown and the systemic close to the same time since it takes time for uptake into the tree.  Use a systemic only if it will be effective; proper irrigation system, soil type and appropriate timing (June-October).
  2.  If a soil applied systemic can not be used, then use a broad spectrum foliar insecticide (pyrethroids preferred) in combination with Movento.  Movento takes several weeks for uptake. Use a Movento only if it is the appropriate time of year (May-October).
  3. If neither a systemic neonicotinoid or Movento can be used, then apply two foliar applications approximately 1 month apart (within a life cycle of the insect). Use a broad spectrum foliar (pyrethroids, organophosphate, carbamate, neonicotinoid) first and any ACP effective insecticide from a different mode of action grouping second.   If weather or other conditions delay applications, treat as soon as possible. 
  4. Treat the find site and neighbor orchards as close to the same time as possible, preferably within 2 weeks of each other to achieve the ‘area treatment effect’.  All blocks that intersect an 800 m radius should be treated in their entirety.  Blocks that are outside the 800 meters and are in the direction of prevailing winds should also be considered for treatment.

See the pesticide labels and the UC IPM guidelines for citrus Asian citrus psyllid for rate recommendations. 

Seasonal aspects of the treatment program

Psyllids may be discovered in a new region at any time of year, yet insecticides may or may not be effective when the psyllid arrives.  Below is a table suggesting treatment strategies for different times of the year.  This list is a guide.  Always be aware of REI, PHI, MRLs and maximum uses per season that limit the uses of some insecticides.

Winter: In the winter, the population consists mostly of the adult stage of the psyllid, temperatures are cold and some insecticides don’t work well in the winter and it is difficult to treat multiple times.  Therefore, the recommendation in winter is to apply a single application of a pyrethroid. 

Spring (first flush to petal fall): The first insecticide should be a pyrethroid to get maximum kill of the psyllid, and the second insecticide can be a soft insecticide.  However, if the ACP detection situation arises during bloom, treatment choices would need to be adjusted to avoid hazards to bees.

Summer: In summer, uptake of systemic neonicotinoids is good and so these should be combined with the pyrethroid in areas where they are known to be effective.  The systemic will extend the length of control. If they can not be used, then two foliar insecticides space 4 weeks apart is appropriate, starting with a broad spectrum choice.

 

 

Winter

Dec-Jan

Spring

Feather Flush to petal fall
(except bloom*)

Summer –Fall
  June-Nov

Best management Practice

Pyrethroid

Pyrethroid + any other foliar applied approx 4 weeks apart

Pyrethroid + systemic neonicotinoid or other foliar

Treatment 1

Danitol

Baythroid XL

Mustang

Tombstone

Leverage (beta cyfluthrin + imidacloprid)

Danitol

Baythroid XL

Mustang

Tombstone

Danitol

Baythroid XL

Mustang

Tombstone

Treatment 2

 

Actara, *Agri-Mek, *Delegate, *Fujimite, *Micromite, Movento, *Altacor,   Lorsban Advanced, Dimethoate

Systemic imidacloprid, Platinum
Or other foliars

 *could be used during bloom

Webmaster Email: eegraftoncardwell@ucanr.edu