Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

A recommended spray programme for leafroller and codling moth control in Central Otago apple orchards.

Abstract

Apple orchards in Central Otago, New Zealand, are attacked by a complex of 3 leafroller species (Epiphyas postvittana, Ctenopseustis obliquana and Planotortrix octo) and Cydia pomonella. The relationship between pheromone trap catches, crop damage, and insecticide spray programmes was investigated in commercial orchards and the Clyde Research Centre during 1990-94. The leafrollers are bi- (or partially tri-) voltine and the generations of all species are well synchronised. A post-bloom organophosphate spray programme is recommended comprising 3 sprays against the first generation, supplemented by 0 to 2 further sprays against the 2nd for early to late harvested cultivars, resp. C. pomonella rarely required an additional spray and only when pheromone trap catches were above the spray threshold. The most damaging species in the region was P. octo.