Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Monitoring pests of peaches in Hawke's Bay to reduce insecticide applications.

Abstract

The tortricids Epiphyas postvittana, Planotortrix octo, Ctenopseustis obliquana and Cydia molesta [Grapholita molesta] and the aphid Myzus persicae, were monitored with pheromone traps and by counts on shoots and fruit, in 4 peach cv. Golden Queen orchards in Hawke's Bay, New Zealand, during 1994-95. Insecticides were applied only when pest thresholds were exceeded. The thresholds used were: >16% trees infested for M. persicae; 8/trap per week for G. molesta; and >8% of trees infested until December and then >2% of fruit infested for the other tortricids. Insect damage on fruit at harvest from all the blocks was within acceptable levels for process peaches. Excluding clean-up sprays, the monitored blocks averaged 1.2 insecticide applications during the season compared with the district average of 3.4 applications. The industry average in Hawke's Bay between 1990-91 and 1994-95 was 4.0 insecticide applications per season, with up to 13 applications per season on some orchards.