Preliminary results with mating disruption of apple leafroller, Tortrix capensana, in South African pome fruit orchards

Barnes, B.N.; Blomefield, T.L.

Difesa delle Piante 20(1/2): 49-53

1997


Accession: 003239297

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Abstract
Tortrix capensana was present in South African pome fruit orchards in the 1970s, causing fruit damage of up to 6% per year in some orchards. By 1980, T. capensana populations had decreased to almost non-detectable levels, an event linked to the introduction of synthetic pyrethroids into the pome fruit spray programme in the late 1970s. In 1994, low populations of T. capensana were again detected in apple orchards under mating disruption of codling moth, Cydia pomonella. In 1995, a 1.5-ha block of apples in a codling moth mating disruption programme project (Isomate-C Plus) was treated with Isomate-C Special (codling moth plus leafroller pheromone). T. capensana populations were monitored using omnivorous leafroller (Platynota stultana) sex pheromone lures in wing traps. Leafroller traps in the Isomate-C Special block were virtually shut down, while catches in adjoining Isomate-C Plus orchards were relatively high. Dual control of codling moth and leafroller by mating disruption may therefore be feasible. However, the high cost of mating disruption, and the availability of effective insecticides, will probably influence the use of this technique for leafroller control.