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Research is on-going to determine effective control strategies.

Insecticides

For an insecticide to be registered in the United States, the product must be labeled for the crop and the insect pest.  When the insect was detected in New York, Dr. A. M. Shelton from Cornell was able to get special registrations in July 2010 for several insecticides using a registration called FIFRA 2(ee) which essentially expands the crop label to include another pest. Justification for registering these insecticides was based on them already being labeled for other insect pests on these crops and their probable effectiveness against leek moth in New York. These insecticides need to be tested for their effectiveness under field conditions.

checking for leek moth; insect trap
Pheromone traps can be used to determine peak flights of each generation. Applications can begin 7-10 days after adults are caught as eggs begin to hatch. Set out traps in early April to find adults as they emerge from overwintering sites.

Registered Insecticides

As of the creation of this website (Oct. 2011), the following insecticides are able to be legally applied in New York.  Entrust and DiPel are OMRI listed materials allowed for organic production, while all five insecticides can be used in conventional production.

Pesticide Name and EPA Registration No.:

  1. Warrior II with Zeon Technology (EPA Reg. No. 100-1295)
  2. Radiant SC (EPA Reg. No. 62719-545)
  3. DuPont Lannate LV Insecticide (EPA Reg. No. 352-384)
  4. Entrust (EPA Reg. No. 62719-282)
  5. DiPel DF Dry Flowable Biological Insecticide (EPA Reg. No. 73049-39)

Biological control

There is considerable interest in finding biological control agents that can be effective in controlling leek moth.  

One parasitoid, Diadromus pulchellus (Hymenoptera: Ichneumonidae), from Europe has been released in Canada.  

Additionally, the parasitoid Conura albifrons (Walsh) (Hymenoptera: Chalcididae), a native of North America, has been recovered from leek moth in New York.

Generalist predators may also be helpful in suppressing leek moth populations.

Cultural/Preventative

There are several cultural controls that have been recommended for control of leek moth, but none of them have been evaluated under field conditions.

Cultural controls include row covers, removal of larvae from the plant, rotating to a non-host crop (i.e. non-Allium crop), and removal of host plant debris at the end of the season to minimize adult overwintering.