New Zealand Plant Protection 60 (2007): 72-77
Six-spotted mite (Eotetranychus sexmaculatus) is a key pest of avocados in New Zealand. Six-spotted mite feeding on leaves can cause excessive leaf drop and a subsequent reduction in tree productivity and yield. Sixspotted mite development, longevity and fecundity were determined at six constant temperatures (10, 13, 18, 21, 25, 30°C) on avocado leaf discs. No larvae hatched from eggs at 10°C. The number of days to complete egg development ranged from 5.3 days at 30°C to 23.9 days at 13°C. Total developmental time (egg to adult) ranged from 29.6 days at 18°C to 11 days at 30°C. Mean adult longevity ranged from 18.8 days at 30°C to 41.4 days at 18°C. The number of eggs laid per female ranged from 6.9 to 20.9. Degree-day models were developed for eggs, larvae and nymphs. It was estimated that 202.8 degree-days, above a threshold temperature of 12.2ºC, were required to complete development from egg to adult.
Keywords: six-spotted mite, Eotetranychus sexmaculatus, temperature, development rate, longevity, fecundity.
Copyright © 2007 New Zealand Plant Protection Society (Inc.).