Codling moth control problems in Ontario Orchards: Where do we go from here?

In the last few years increased damage from codling moth Cydia pomonella Linnaeus (CM) has been reported in Ontario and other major apple growing areas. There are several factors that may be responsible for this increase in damage including use of less effective products, unseasonable weather, timing of sprays, low rates of conventional insecticides, and the development of pesticide resistance. Apple growers continue to switch from using broad spectrum organophosphate (OP) insecticides to using more target specific "reduced-risk" products.

While these products can be effective in managing pests, many work differently from conventional insecticides. Producers need to become familiar with them and gain some confidence in how best to use them in their IPM programs. Reduced-risk pesticides may be less persistent, may not result in rapid knock-down of the pest, may have reduced efficacy and may have different application timing and thresholds than conventional control products.

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