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Chemical control of leafrollers - Resistance management |
Resistance management is used to delay or prevent the development of insecticide resistance in pest populations. A variety of techniques are used to reduce the intensity of selection for resistance (e.g. less frequent spraying, varying the insecticide group used), to retain susceptible insects for resistance dilution (e.g. refuges for susceptibles, immigration of susceptibles), to integrate insecticide use with natural enemies (e.g. use of selective insect growth regulators), and to prevent mating of resistant insects (e.g. mating disruption).
| Resistance case | Resistance to: | Management | ||
| Lightbrown apple moth - Nelson | azinphos-methyl carbaryl |
Distribution of resistance determined by pheromone trapping and testing of male moths. Use of chlorpyrifos (low cross-resistance), and more recently insect growth regulators (e.g. Match® and Mimic®). Gorse and broom shown to be important sources of susceptible insects migrating into orchards. | ||
| Greenheaded leafroller - Otago and Hawkes Bay | azinphos-methyl chlorpyrifos carbaryl tebufenozide |
Mating disruption used to prevent/reduce mating of resistant insects. Retention of immigrant susceptible moths to dilute resistance. Reduced numbers of insecticide applications, and inclusion of Match® (no cross resistance) in the spray programme. |
The registration of Match®, Mimic®, and Success NaturolyteTM provides three insecticides with different modes of action for the control of leafrollers, which can assist with resistance management.