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New Zealand Plant Protection 60 (2007): 72-77

Development rates, longevity and fecundity of six-spotted mite (Eotetranychus sexmaculatus) at constant temperatures

L.E. Jamieson and P.S. Stevens

ABSTRACT

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, 30C) on avocado leaf discs. No larvae hatched from eggs at 10C. The number of days to complete egg development ranged from 5.3 days at 30C to 23.9 days at 13C. Total developmental time (egg to adult) ranged from 29.6 days at 18C to 11 days at 30C. Mean adult longevity ranged from 18.8 days at 30C to 41.4 days at 18C. 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 12.2C, were required to complete development from egg to adult.

Keywords: six-spotted mite, Eotetranychus sexmaculatus, temperature, development rate, longevity, fecundity.

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