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Codling moth controls

Author: Kathryn Carter - Pome Fruit IPM Specialist/OMAFRA; Hannah Fraser, Entomology Program Lead/OMAFRA
Creation Date: 11 June 2009
Last Reviewed: 11 June 2009



Codling moth adults are now flying in most areas of the province. Just a reminder to everyone that OMAFRA has now adopted the degree day model for codling moth that is being used in the US and elsewhere in the Northeast. By adopting this model it will allow growers to adapt their timings of products for ovicides and larvicides. The following is some useful information on the timing of products using this new model degree base (10 °C):

Table 1: Optimal timing for Codling moth sprays
Compound Trade Name Chemical Class Life-stage Activity Optimal Spray Timing for Codling moth (base 10° C) Mite Flaring Potential
Guthion, Imidan organophosphates Eggs, Larvae, Adults Biofix + 139 DDC L - M
Delegate spinosyn Larvae Biofix + 139 DDC  
Altacor anthranilic diamide Eggs, Larvae Biofix + 139 DDC  
Assail, Calypso neonicotinoid Eggs, Larvae, Adults (limited) Biofix + 111-139 DDC
Residue over eggs		 M
Intrepid IGR (MAC) Eggs, Larvae, Adults (sub-lethal) Biofix + 83-111 DDC
Residue over eggs 		L
Rimon IGR
(chitin inhibitor)		 Eggs, Larvae Biofix + 55 DDC
Petal fall (and repeat application 10-14 days later)
Residue under eggs		 M
Granulovirus biopesticide Eggs, Larvae Biofix + 139 DD
Residue over eggs. Repeat 3-4 sprays at 7 day intervals 		none
Isomate C Plus* pheromone (mating disruption) Adult males bloom none

Table adapted from MSU
* May require supplemental insecticides. Contact us for more information.

 

Why we use these timings:

Table 2. Codling moth GDD model and insecticide timings for larval control
GDD base 10 C (Post Biofix) Event Action

Pink bud		 Development of overwintering larvae Set traps
0 GDD 1st sustained moth captures Set GDD equals 0
139 GDD Start of 1st generation egg hatch Timing for 1st treatment if over threshold (for larva targeted materials)
194 GDD 1st generation egg laying & hatch Delayed timing for 1st treatment if pest pressure is low, or for 2nd treatment if an ovicide was applied at 55 GDD)
278-361 GDD Peak of 1st generation egg hatch Timing for additional larvacide if monitoring of codling moth activity indicates a treatment is needed
555 GDD Expected end of 1st generation activity  
667-694 GDD Start of 2nd generation egg hatch Timing for treatment if over threshold (for larva targeted materials)
1167 GDD Expected end of 2nd generation activity  




For more information:
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E-mail: ag.info.omafra@ontario.ca