University Of Tasmania

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Day-degree development and phenology modelling of the immature stages of Chrysophtharta agricola (Chapuis) (Coleoptera: Chrysomelidae), a pest of eucalypt plantations

journal contribution
posted on 2023-05-16, 14:11 authored by Nahrung, HF, Geoff AllenGeoff Allen, Patel, VS
Day-degree developmental requirements and lower temperature thresholds were determined in the laboratory for the immature lifestages and preoviposition periods of Chrysophtharta agricola, a pest of eucalypt plantations in Tasmania and Victoria. These data were used to provide a predictive model for C. agricola's spring-summer phenology under field conditions. The model was validated using field data from two Tasmanian field sites over three seasons. Lower temperature thresholds for immature development ranged from 2.8°C (Liv) to 10.3°C (Li), while the lower temperature threshold for oviposition was 7.4°C for teneral and overwintered adults. Total immature development time (egg-adult) was approximately 400 ± 16 DD above 8 ± 0.41°C. Development time did not differ between males and females, or between offspring of different females. Beetles reared at 25°C were significantly larger than those reared at low temperatures. Day-degree models were usually a good predictor of the appearance of developmental stages in the field.


Publication title

Australian Journal of Entomology








Tasmanian Institute of Agriculture (TIA)


Blackwell Publishing Asia

Place of publication

Carlton, Victoria, Australia

Repository Status

  • Restricted

Socio-economic Objectives

Hardwood plantations

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    University Of Tasmania